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Variable Stars Common Observation
Mission in Particular Areas of the Sky

1347 stars discovered as of Nov 15, 2015
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Project Historic Timeline

...before September 2012...

Aug 17, 2012:    55 new discoveries are added increasing the total number of variable stars to 686 up to now. Please, follow chronologically ordered table for more details.

Jun 24, 2012:    During the past three weeks 53 more new variable stars were discovered! Plus another 68 stars were added by July 20th. More details coming soon. Please, check the list of variable star discoveries in a chronological order out here.

Jun 01, 2012:    By adding up 38 stars in this batch, we reached another notable milestone of 500 variables! That's quite a good number of new stars discovered by an amateur team in just eight months. The first interesting star today is a yellow irregular 13m-star in Cepheus submitted as IB: - VSX J205546.6+830453 (IB:). The period in unknown. Another 3 irregular variables are fairly bright stars:VSX J165942.0+493218 (L) in HER - its amplitude is 9.3 - 9.5 R1; 000-BKM-394 (L) in LYR, 000-BKM-484 (L) in CEP.

Besides numerous eclipsing EW-stars, there are 4 RRC with very smooth light curves and periods around 0.3d. Here they are: VSX J133256.7+123949 (RRC), VSX J140559.2+042600 (RRC), VSX J130443.2+125540 (RRC) - all in Virgo; VSX J144024.7+135146 (RRC) in Bootes. A very interesting EW/RS in Leo is VSX J101838.7+091831 (EW/RS). See the light curve for details. Another EW/RS has been found in the constellation of Coma Berenices: VSX J133031.1+161202 (EW/RS) with an apparent amplitude of 13.2 - 13.7 V.

It is worth to look at the light curve of a possible "BY Dra"-like VSX J125319.8+481347 (BY:) in Canes Venatici. The period is 1.608d. The second BY variable was found in Virgo: VSX J124051.2+055813 (BY), which has the period of 3.5 days and 0.7m amplitude.

20 out of 38 stars this time are EW eclipsing binaries, increasing the total number of EWs discovered in the project to more than 200...

May 23, 2012:    During the last month half a hundred new variables were discovered. Mostly they are irregular and eclipsing binaries variables, but there are some really interesting objects.

VSX J035503.7+313157 (INAT) in Perseus has been submitted as an eruptive variable (INAT). Also, it is classified as a known T Tauri star. The star changes its brightness in the range of 11.17 - 11.85 CV, though the period remains undefined. Another TTS/ROT from the Perseus OB2 star forming complex is VSX J034605.3+292034 (TTS/ROT). Its period is only 0.35109 d.

Quite faint 1m-amplitude pulsator (RRab) with a period of 0.54259 days has been also found. It is VSX J092806.8+090728 (RRAB) in LEO. Rise duration is about 15%. In Cancer, there is a similar one: VSX J092043.5+192612 (RRAB) with the period of 0.64156 days.

It is worth to pay attention to our 2 new EW/RS variables in roughly the same sky area: VSX J095747.5+060319 (EW/RS) in Sextans and VSX J092905.5+131331 (EW/RS) in Leo. Both stars have short periods around 0.3d. and change their apparent magnitude in about 0.5m.

The last notable object to be mentioned is a classical Algol-like eclipsing binary system with the amplitude of 1.5m: VSX J095815.9+060526 (EA) in Sextans. The period is 2.88418d.

Apr 20, 2012:    This week we present a number of semiregular and irregular variable stars. Though there were some interesting regular pulsators and eclipsing variables found as well. A binary system of type EA orbiting in 12.64 days is VSX J182525.8+595615 (EA) in DRA. It has a deep secondary minima. Another really interesting binary is VSX J054250.6-140128 (EB) in LEP, which demonstrates a distinctive light curve having the amplitude of 13.24 - 13.55 (V).

Also, a new Mira-like star has been found. It is a long-periodic variable with the period of 342 days - VSX J032707.0+594644 (M) in Camelopardalis. Its maximum brightness as high as 11.8m. The actual light curve is a blend with two companions: 2MASS J03270615+5946309 (Rmag = 15.6, J-K = 0.73) and 2MASS J03270570+5946255 (Rmag = 14.3, J-K = 0.46). The amplitude of the mira is also reduced. While researching some related stuff, there were two existing variables refined by Andrey Prokopovich (revisions by Sebastian Otero): Mis V1285 and V1303 Cen.

Among other objects it is worth to pay attention to a possible CWB in Aquarius with the period of 1.10766 days:VSX J232718.9-123850 (CWB:). Its brightness varies between 13.55 and 14.05 (V). Though it is more likely a pulsating variable, the variability type identification is unstable, so further research is expected.

Below is the list of other variables from this update grouped by their variability type:At last let's go for a couple of interesting pulsators. A BY Dra-like variable - VSX J223207.6-184313 (BY) in AQR with an amplitude of 13.6 - 14.1 in V; the period is 1.567 days. The light curve has a sign of possible contamination. There is a companion 17" apart (2MASS J22320782-1843303; 16.0 V-mag and J-K = 0.71) that may be causing partial light contamination.

VSX J130739.4+011029 (RRAB) is a RR Lyrae-like pulsator that was found in the constellation of Virgo. It demonstrates a presence of Blazhko effect. The primary period is 0.63610, while the secondary possible is 0.62179 d.

Apr 12, 2012:    Today there was the 400th star discovered! This is a fairly good result for an amateur project started just half a year ago.

Regarding the new portion of stars, we note the following objects.VSX J163550.5+661932 (HADS) in DRA has the period of 4 hours 7.5 minutes only. Rise duration is 18%, so the star becomes 1.6 times brighter rising from its faintest to the brightest just in 45 minutes! The amplitude is about 0.5 mag.

VSX J175012.1+685801 (RS) in DRA changes its brightness in 30.57 days and has moderately good light curve data in NSVS. The first classical Delta Scuti-like variable star was discovered for the project. It is VSX J084253.4+004602 (DSCT) in HYA with the period of approximately 1 hour and 40 minutes. Its amplitude is about 0.15mag (CV). The star lays almost on celestial equator. Another short-period (1 hour 48 minutes) Delta Scuti variable, but high-amplitude, is VSX J024048.2-070617 (HADS) in Cetus.

Apr 09, 2012:    Another ~80 new variables in two weeks! This is a huge list, so it would be hard to put it on the news. All the variables are available in the Stars section of the website for your review though.

Mar 20, 2012:    More than a hundred stars have been discovered during a single month! Adding up 40 more new variables, we reached the milestone of 300 today! More details on recent variables are coming soon...

Mar 09, 2012:    This huge update presents 45 variable stars which have been discovered recently. It's a whole bunch of stars! More than 70% of them are eclipsing binary systems of all kinds providing quite clear light curves: 23 EW(s), 3 EB(s) and 6 algols of EA type. It is worth to create a list by a constellation they were found in:
Besides these eclipsers, there 15 new variable stars of different types. Four RR Lyrae-like pulsators with periods around 1/3 of a day, as VSX J212106.8-082959 (RRC) in AQR, 000-BKJ-950 (RRC) in DRA, 000-BKJ-829 (RRC) in ERI and 000-BKJ-800 (RRC).

Our collection is also supplemented with 3 new fairly bright BY Dra-like variables. Here they are: VSX J020251.2+282021 (BY) in TRI with a period of 3.3 days; a 10.1-days VSX J100630.0+560621 (BY) in UMA, VSX J125521.2+510812 (BY) in CVN. All of them have magnitudes around 13.5m. Six more interesting objects are to be presented within this status update. Two of them are RS Canum Venaticorum active binaries with a period of 10.02 and 19.9 days respectively: 000-BKK-142 (RS) in UMA, VSX J142912.0+474055 (RS) in BOO.

This time we have a rather exotic object of ELL type with a period of 46.8 days - VSX J111629.9+554342 (ELL) in UMA. The last three stars in our today's release are: VSX J181443.9+553123 (CWA) in DRA (41.3d), 000-BKK-094 (SRD) in AQR, 000-BKK-083 (SRD:) in DRA.

Feb 24, 2012:    We continue to check the circumpolar regions, particularly, the constellation of Ursa Major. This update contains 10 stars (out of 14) from UMa. Most of them are eclipsing binaries of EW type, but we also have a VSX J090204.8+523429 (EB) doing the full cycle in 0.41023 days and an interesting RR Lyrae pulsating variable - VSX J100903.4+513745 (RRC). Its period changes over time: it was 0.260147 d. during the NSVS time span (1999-2000) and 0.260104 d. between 2005 and 2011, according to the Catalina Real-Time Survey (CRTS) data. Here is a list of close EWs binaries discovered within the UMa, all of them have typical periods around 1/3 of a day:
Another variable to be mentioned is VSX J004712.3+263439 (RRC) in AND, demonstrating a little shifting of a light curve at the minimum to the phase of 0.58. Its magnitude range is 13.35 - 13.85 V.

The last three typical EWs are from the constellation of Eridanus: 000-BKJ-501 (EW), 000-BKJ-549 (EW), 000-BKJ-550 (EW).

Feb 21, 2012:    The VS-COMPAS project reached another notable milestone to celebrate: the 200th star is discovered!
Current update includes 4 new variables. There was a HADS pulsator in Ursa Major found: VSX J093723.5+550848 (HADS) in UMa with a period of 1 hour 41 minutes 50 seconds only! VSX J094456.9+473030 (RRC) in UMa is a RRC demonstrating a period of 0.32975 days. Also we have two eclipsing binaries: 000-BKJ-485 (EB) in UMa and a system in Eridanus - 000-BKJ-500 (EB) in ERI (period: 1.1 days). Here more stars to come!

Feb 20, 2012:    Another massive update containing 20 newly discovered variable stars! Nearly half of them are from Ursa Major and Andromeda. Today we have three RR Lyrae-like variables to be presented: VSX J003509.2+351641 (RRAB) in AND,VSX J093810.8+693819 (RRC) in UMa and a faint, but 1.0m amplitude, RRAB-pulsator VSX J132912.7+015344 (RRAB) in VIR. You may be also interested in observing 3 new EA eclipsing systems brighter than 14m: 000-BKJ-368 (EA) in UMa with a period of 3.0576 days; 000-BKJ-338 (EA) in SER and a 1.8695d-period 000-BKJ-291 (EA) in AND.

This time we came up with two interesting stars from Aquarius. The first one is a high-amplitude Delta Scuti variable with a period of 1 hour 44 minutes and 15 seconds only - VSX J205846.6+014452 (HADS) in AQR. Another exotic object is represented by a W Vir-like pulsator changing its brightness in the range of 13.85 - 15.0 V in 1.44666 days. This is a short-periodic CWB from AQR: VSX J214504.1+024621 (CWB).

Unsurprisingly, we have another portion of EW eclipsing variables with periods less than half a day again. Nine of them! Ursa Major contains the following EW-stars from today's update: 000-BKJ-332 (EW), 000-BKJ-370 (EW), 000-BKJ-369 (EW), 000-BKJ-333 (EW), 000-BKJ-330 (EW). Others can be found in: 000-BKJ-418 (EW) in AND, 000-BKJ-341 (EW) in HYA, 000-BKJ-340 (EW) in AQL and 000-BKJ-339 (EW) in PSC.

Finally, there are 2 Beta Lyrae-like eclipsing variables and a single semi-regular VSX J003920.5+274800 (SR) in AND with a period of 126 days. The EBs are: 000-BKJ-375 (EB) and 000-BKJ-292 (EB) - both in AND.

Feb 15, 2012:    That is not all we have for today. The next portion of stars contains a whole bunch of EW eclipsing variables from circumpolar regions. We have 12 of them to be released, so it would be better to group variables by a hosting constellation. Most of newly discovered EWs are ~14m[R1] (and fainter) stars and have periods close to 0.35d, except the bright one (12.3-12.62 R1) - VSX J111824.2+660539 (EW) in UMa, which has a period of 0.64d. Also, we have a RRAB in Ursa Minor demonstrating a 0.73146d period - VSX J132102.6+711358 (RRAB). And don't forget mentioned numerous EWs, here they are: Clear skies!

Feb 15, 2012:    Hold on for a minute... Let us welcome two new members of the VS-COMPAS data mining team:
  • Tatiana Lebedeva (Minsk, Belarus)
  • Valery Tsehmeystrenko (Odessa, Ukraine)
They have joined the project recently and have already contributed with a several of new discoveries. This time 4 new variables came out. Three eclipsing binaries with periods nearly 1/3 of a day were discovered: 000-BKJ-190 (EW), 000-BKJ-191 (EW) - both in PEG, 000-BKJ-217 (EW) in AND. The last one is a high-amplitude Delta Scuti-like pulsating variable in Pegasus with a period of 0.09934d only - VSX J231826.0+175744 (HADS). This star is quite bright changing its brightness in a range of 13.2-13.65 V, so be ready to pick it up for further observations.

Feb 14, 2012:    We are back here again! There 12 stars have been revised and about 20 new variables discovered since the last update was announced. Today we are presenting 10 of those recently discovered variables. These include two RS, eight eclipsing binaries and a BY Dra-like variable. Particularly, it's worth to pay attention to a bright RS in Monoceros - VSX J062439.9-083452 (RS) - which has an amplitude of 0.2m between 10.6 and 10.8 in visual range. The period is 11.13 days. Another RS CVn system is VSX J142414.5+552217 (RS) in UMa. It has a period of 6.7678 days. Fairly bright (11.8m) VSX J040840.9+033440 (BY) in TAU shows a really interesting light curve. Being a M0e-star, it demonstrates a period of 0.318 days only. Considering fast rotation it is also possible EW-type variable. This case definitely requires further observations and measurements.

The 000-BKG-862 (EA) in ORI is another eclipsing binary of EA type. Though the period is defined as 3.32244 days, it might also be half the value given with no secondary eclipse. The light curve is very flat at the top. Among others, there are 5 faint EW binaries with periods less than 1 day have been found, 4 of them in Pisces: 000-BKH-153 (EW), 000-BKH-232 (EW), 000-BKH-502 (EW) and 000-BKH-503 (EW) - all in PSC, 000-BKJ-154 (EW) in DRA. More variables are coming soon!

Dec 23, 2011:    The 150th star is here! Current update contains 5 news variable stars. Among those, it is worth to mention two fairly bright EA/RS systems:
VSX J180107.3+021304 (EA/RS) in OPH with a magnitude range of 9.5 - 9.67 V! and VSX J055520.0-142244 (EA/RS) in LEP (11.3 - 11.65 V). Another object are: a 0.63674 days BY Dra-like rotator - 000-BKG-786 (BY) in LEO; 000-BKG-841 (RRAB) 0.9m-amplitude pulsator in OPH and a short-period eclipsing W UMa-like system in LIB - 000-BKG-840 (EW).

Dec 22, 2011:    As a by-product, there was a list of ROSAT sources identified as VSX objects created. The key feature is that we created an alias mapping between known VSX objects (which have no 1RXS alias specified yet) and ROSAT sources. The resulting list containing 1640 records was reviewed by the AAVSO Administration and approved for a submission to the primary VSX database. Now the VSX contains ROSAT aliases for more than 2500 objects, covering the whole set of known variables as of December 04, 2011.

Dec 14, 2011:    It's been two weeks since the last update... This time we are reporting 5 new interesting variables. Among those, our first Cepheid with a period of 9.15 days - VSX J060826.0+162409 (DCEP) in ORI; two similar RRAB stars with 0.53d periods - 000-BKG-755 (RRAB) in LEO and 000-BKG-762 (RRAB) in UMA. Also there was a rather ordinary EA eclipser found in CAM: 000-BKG-756 (EA). The last one is a very interesting EA/RS eclipsing system demonstrating an X-ray activity: VSX J105319.3+220623 (EA/RS) in LEO.

Nov 28, 2011:    We proud to present the 140th object - a Naked/Diskless T Tauri Star from the Orion OB1 association. This K6 object has a period of 2.11 days - 000-BKG-644 (IT/ROT) in ORI.

Nov 28, 2011:    Today's update presents a bunch of eclipsing variables - eight W UMa-like systems (EW), two EB and an EA. Besides those, it is worth to pay attention to a new RRab pulsator with a period of 0.622d and 0.65m amplitude - VSX J031354.0+023632 (RRAB) in CET. Another interesting object is a BY Dra-like rotating star in CAS: VSX J235810.1+603129 (BY). It has a period of 2.584 days. All of discovered eclipsing variables have periods less than a day. Clear skies!

Nov 24, 2011:    Here is a status update announcing 11 new variable objects! This time there were five irregular objects discovered as well as four short-period eclipsing binaries - 000-BKG-520 (EB), 000-BKG-576 (EW) - both in ORI, 000-BKG-552 (EW) in PEG and 000-BKG-579 (EW) in PSC. Also, we would like to present another interesting BY Dra-type star (P = 2.48d): 000-BKG-575 (BY) in TAU and a semi-regular object 000-BKG-522 (SR) in CAS with a period of 68d.

Nov 18, 2011:    Here are 5 new variables. Among those, a possible Mira-like red variable with a magnitude range of 2m in CEP - 000-BKG-188 (M:) and an irregular variable 000-BKG-189 (L) in CEP. Today we came with two exotic objects. The first one is a BY Dra-type rotating variable with a period of 10.9d - VSX J061124.1+273716 (BY) in GEM. Another interesting object is a weak-lined T Tauri Star! It is a G5IV subgiant VSX J050030.0+172359 (WTTS/ROT) in TAU with a period of approximately 3.08 days. Also we are reporting another short-period EW-type binary - 000-BKG-333 (EW) in PSC. Its period is 0.2782d only, having the magnitude range between 14.05 - 14.95 V.

Nov 15, 2011:    This status update includes 7 new variables. Six of them are eclipsing systems of all the main kinds, another one is an semi-regular object in TAU - 000-BKG-172 (SR) with a period of 63d. There are two EA binaries and an EB: 000-BKG-170 (EB), 000-BKG-169 (EA) - both in ORI and 000-BKG-186 (EA) in CYG. Also there were three close EW systems found: 000-BKG-171 (EW) in AND, 000-BKG-185 (EW) in AND, 000-BKG-187 (EW) in TAU.

Nov 13, 2011:    Three new EWs with periods less than one day: 000-BKG-162 (EW) and 000-BKG-163 (EW) - both in ORI, 000-BKG-160 (EW) in PEG.

Nov 13, 2011:    Congratulations! We achieved 100 variables! The 100th star is a RRab pulsating variable in Taurus with a period of 0.73536d: 000-BKG-161 (RRAB). The case is very interesting: ASAS-3 and NSVS data are for a blend of 4 stars - two close binaries 20" apart. See details here.

Nov 11, 2011:    The project is moving towards its next major milestone. This time we are reporting about 5 new eclipsing systems, 2 semi-regular objects in CYG - 000-BKG-145 (SR), 000-BKG-146 (SR) - and 1 irregular, 000-BKG-147 (L) in CAS. Eclipsing variables include four objects in Andromeda and one in Taurus: 000-BKG-107 (EW), 000-BKG-108 (EW), 000-BKG-109 (EW) and 000-BKG-144 (EA) - all in AND; 000-BKG-159 (EW) in TAU.

Nov 10, 2011:    Plus eight new variables: an irregular - 000-BKF-944 (L) in PEG and seven previously unreported short-period eclipsing systems! These are three Beta Lyrae-like binaries: 000-BKF-897 (EB) in ORI, 000-BKF-945 (EB) in CEP and 000-BKG-054 (EB) in AND. Also there were four EW systems reported: 000-BKF-902 (EW) in TAU with a short period of 0.29658d, 000-BKF-943 (EW) in AND, 000-BKF-903 (EW) in ORI and 000-BKG-056 (EW) in CEP.

Nov 08, 2011:    Orion still gifts us with new eclipsing systems: 4 new interesting EW variables! 000-BKF-778 (EW), 000-BKF-779 (EW), 000-BKF-780 (EW), 000-BKF-781 (EW). Besides those, there is a EB/KW eclipser 000-BKF-758 (EB/KW) in AND and a semi-regular in CYG: 000-BKF-757 (SR).

Nov 07, 2011:    Six out of the last 9 registered discoveries are eclipsing systems also, close W UMa-like binaries mostly with short periods in the range of 0.25-0.4d. Some of them: 000-BKF-737 (EA) in PER, 000-BKF-752 (EW) in ORI, 000-BKF-751 (EW) in TAU (P=0.26d), 000-BKF-754 (EW) in TAU. Also there are two irregular variables - 000-BKF-742 (L) in CYG and 000-BKF-740 (L) in CAS - and a red SR with a period of 124d: 000-BKF-738 (SR) in CAS.

Nov 04, 2011:    Four more variable stars in TAU. Eclipsing systems are represented by a beautiful classic EA-system 000-BKF-731 (EA) and two EWs - 000-BKF-734 (EW), 000-BKF-735 (EW). Among this there was a high-amplitude Delta Scuti-type star discovered: 000-BKF-739 (HADS). Its magnitude varies between 13.85-14.4m with a period of 0.097d.

Nov 03, 2011:    The survey moves further, so here time comes to announce 14 recently discovered stars! It's worth to mention 5 eclipsing systems and, of course, the first RR Lyrae variable for the project - 000-BKF-730 (RRc) in TAU! It has a period of 0.27691d and varies between 14.0-14.6m. Another notable object is a suspected cataclysmic U Gem-type dwarf-nova variable in CAS which has got its designation as VSX J031816.1+760817 (UG:) in TAU. Check out for remarks here. Eclipsing systems are the following: 000-BKF-693 (EW) in AND, 000-BKF-694 (EB) in PSC, 000-BKF-710 (EW) and 000-BKF-713 (EW) both in ORI, 000-BKF-728 (EW) in TAU. Looking forward towards new interesting discoveries!

Oct 31, 2011:    Congratulations! 50 stars have been discovered during the project's first month!

Oct 30, 2011:    10 new stars in three days. The most interesting objects are 2 possible Mira-stars and 3 eclipsing systems:
000-BKF-542 (M:) in PER, 000-BKF-637 (M:) in CAS, 000-BKF-616 (EW) in CAS, 000-BKF-635 (EW) in CET, 000-BKF-631 (EB) in LYR.

Oct 27, 2011:    Another irregular object is found - 000-BKF-520 (L) in CAS - and an eclipsing system: 000-BKF-539 (EW) in SER.

Oct 25, 2011:    Three weeks past: the project reached 35 stars in the list. The new one is: 000-BKF-517 (SR) in PER.

Oct 25, 2011:    3 new stars have been registered: 000-BKF-513 (L) in CAS and 000-BKF-515 (SR), 000-BKF-516 (M) - both in AQL.

Oct 22, 2011:    Two RS-type variables discovered:
000-BKF-497 (RS) in TRI and 000-BKF-498 (RS) in CMi.

Oct 20, 2011:    000-BKF-484 (M) in CAS - the first Mira-type star for the VS-COMPAS project.

Oct 18, 2011:    Orion: an insteresting group of 4 eclipsing systems is found; 000-BKF-469 (EW), 000-BKF-472 (EA), 000-BKF-473 (EW), 000-BKF-476 (EW).

Oct 14, 2011:    Overall, 10 stars were discovered in 10 days: mostly SR variables, two eclipsing systems. The last one is 000-BKF-461 (SR) in PER.

Oct 04, 2011:    The first variable star is discovered: an EA-eclipsing system - 000-BKF-425 (EA) in CAS.

Sep 30, 2011:    The project started with a new script to retrieve the NSVS data.

Selected Issue (#5)

Issue #5
March-April 2014

Free Online
PDF Bulletin on Variable Stars

Amateurs' Guide to Variable Stars

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Read Online as e-Magazine

In this issue:
KOI-3278: A self-lensing binary star system by Ivan Adamin

BL Bootis stars - anomalous Cepheids by Ivan Adamin

A revision of NSV 13538 = NSVS 17231162 by Alexandr Ditkovsky

NSVS 11075037 = Dauban V53:
updated elements of a Mira variable in Hercules
by Siarhey Hadon

RS Puppis: the light echoes calibrate standard candles for accurate distance measurements
by Ivan Adamin

SS Lacertae: The non-eclipsing eclipsing binary by Ivan Adamin

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