Eclipsant ttpw W Ursae Majoris (type EW)

 These are eclipses with periods generally less than 1 day, formed by ellipsoidal components almost in contact and with light curves for which it is impossible to specify the exact start and end times of the eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. The light amplitudes are generally <0.8 mag. in V. The components generally belong to the spectral types F-G and later.

 

(description according to VARIABLE STAR TYPE DESIGNATIONS IN VSX at https://www.aavso.org/vsx/index.php?view=about.vartypes)

Star USNO-A2.0 1275-04211992

Variable type EW (W Ursae Majoris-type eclipsing) in the constellation of Auriga, discovered on 17/01/2017 and registered under the code VSX 000-BMD-790. The picture shows the phase diagram 0-2.

  • Name: USNO-A2.0 1275-04211992 

  • AAVSO UID: 000-BMD-790

  • Constellation: Auriga 

  • J2000.0: 05 03 18.02 +42 12 46.2  (75.82508 +42.21283)

  • B1950.0: 04 59 45.72 +42 08 33.3

  • Galactic coord.: 164.212 +0.387

  • Other names: 2MASS J05031800+4212464, UCAC4 662-030903, USNO-B1.0 1322-0145449

  • Mag. range: 15.65 - 16.3 V

  • Epoch: 24 Dec 2016 (HJD 2457746.732) 

  • Period: 0.3031 d  (7.27 h)


 

Star USNO-A2.0 1350-17627090

Variable type EW (W Ursae Majoris eclipsing) in the constalation of Andromeda, discovered on 25/01/2017 and registered in AAVSO with the code 000-BMD-982. A phase diagram of 0-2 is shown in the graph.

  • Name: USNO-A2.0 1350-17627090 

  • AAVSO UID: 000-BMD-982  

  • Constellation: Andromeda

  • J2000.0: 22 58 10.95 +51 11 06.1  (344.54562 +51.18503)

  • B1950.0: 22 55 59.63 +50 55 01.4

  • Galactic coord.: 105.470 -7.806

  • Other names: 2MASS J22581095+5111061, UCAC4 706-109922, USNO-B1.0 1411-0472687

  • Mag. range: 15.7 - 16.5 V

  • Epoch: 14 Jan 2017 (HJD 2457768.442) Ephemeris

  • Period0.2676 d  (6.42 h)

 

Star GSC 02901-00282

Variable type EW (W Ursae Majoris eclipsing) in the Perseus constellation, discovered on 30/01/2017 and registered in AAVSO with the code 000-BMF-156. A phase diagram of 0-2 is shown in the graph.

  • Name: GSC 02901-00282 

  • AAVSO UID: 000-BMF-156 

  • Constellation: Perseus 

  • J2000.0: 04 43 51.75 +41 53 56.9  (70.96563 +41.89914)

  • B1950.0: 04 40 21.60 +41 48 22.8

  • Galactic coord.: 162.174 -2.607

  • Other names: 2MASS J04435174+4153569, UCAC4 660-026094, USNO-A2.0 1275-03649306

  • USNO-B1.0 1318-0107135  

  • Mag. range: 14.04 - 14.28 V

  • Epoch: 19 Jan 2017 (HJD 2457772.597) 

  • Period: 0.2968 d  (7.12 h)

Star USNO-A2.0 1275-03659252

Variable type EW (W Ursae Majoris eclipsing) in the Perseus constellation, discovered on 02/02/2017 and registered in AAVSO under code 000-BMF-273. A phase diagram of 0-2 is shown in the graph.

  • Name: USNO-A2.0 1275-03659252 

  • AAVSO UID: 000-BMF-273 (No observations) 

  • Constellation: Perseus 

  • J2000.0: 04 44 17.29 +41 45 14.6  (71.07204 +41.75406)

  • B1950.0: 04 40 47.39 +41 39 42.3

  • Galactic coord.: 162.336 -2.642

  • Other names: 2MASS J04441729+4145144, UCAC4 659-025632, USNO-B1.0 1317-0107237

  • Mag. range: 16.15 - 16.55 V

  • Epoch: 18 Jan 2017 (HJD 2457771.67) 

  • Period0.2717 d  (6.52 h)

Star USNO-B1.0 1482-0082390

Variable type EW (W Ursae Majoris eclipsing) in the Cassiopeia constellation, discovered on 12/11/2017 and registered in AAVSO under the code 000-BMM-349. A phase diagram of 0-2 is shown in the graph.

  • Variable:                 USNO-B1.0 1482-0082390     

  • AAVSO UID:            000-BMM-349      

  • Constellation:        Cassiopeia     

  • J2000.0:                   01 51 09.47 +58 15 34.5  (27.78946 +58.25958)    

  • Other names:        2MASS J01510944+5815344    UCAC4 742-018988    USNO-A2.0 1425-02530651

  • Variability type:     EW    

  • Mag. range:           13.28 - 13.78 V    

  • Epoch:                    12 Nov 2017 (HJD 2458070.341)     

  • Period:                    0.2863106 d  (6.87145 h)

Star USNO-B1.0 1491-0068060

Variable type EW (W Ursae Majoris eclipsing) in the constellation of Cassiopeia, discovered on 16/11/2017 and registered in AAVSO under the code 000-BMM-933 . A phase diagram of 0-2 is shown in the graph.

  • Variable:                  USNO-B1.0 1491-0068060     

  • AAVSO UID:             000-BMM-933 

  • Constellation:         Cassiopeia     

  • J2000.0:                   02 00 22.20 +59 06 11.0  (30.09250 +59.10306)    

  • Other names:         2MASS J02002219+5906110    UCAC4 746-018921    USNO-A2.0 1425-02771631

  • Variability type:      EW    

  • Mag. range:            15.8 - 16.6 V    

  • Epoch:                     16 Nov 2017 (HJD 2458074.132)     

  • Period:                     0.419985 d  (10.0796 h)

Star USNO-B1.0 1456-0072638

Variable type EW (W Ursae Majoris eclipsing) in the constellation Perseus, discovered on 22/12/2017 and registered in AAVSO under code 000-BMN-042 . A phase diagram of 0-2 is shown in the graph.

  • Variable:                  USNO-B1.0 1456-0072638     

  • AAVSO UID:             000-BMN-042  

  • Constellation:         Perseus     

  • J2000.0:                   02 13 42.67 +55 41 39.1  (33.42779 +55.69419)    

  • Other names:         2MASS J02134266+5541391    UCAC4 729-019944    USNO-A2.0 1425-03113478

  • Variability type:      EW    

  • Mag. range:            15.35 - 16.45 V    

  • Epoch:                     22 Dec 2017 (HJD 2458110.416)     

  • Period:                    0.290391 d  (6.9694 h)

Star USNO-B1.0 1453-0071653

Variable type EW (W Ursae Majoris eclipsing) in the constellation Perseus, discovered on 25/12/2017 and registered in AAVSO under code 000-BMN-057 . A phase diagram of 0-2 is shown in the graph.

  • Variable:                   USNO-B1.0 1453-0071653     

  • AAVSO UID:              000-BMN-057      

  • Constellation:          Perseus     

  • J2000.0:                    02 13 25.24 +55 22 33.2  (33.35517 +55.37589)    

  • Other names:         2MASS J02132524+5522332    UCAC4 727-019555    USNO-A2.0 1425-03106257

  • Variability type:      EW    

  • Mag. range:            15.55 - 16.2 V    

  • Epoch:                     25 Dec 2017 (HJD 2458112.558)     

  • Period:                     0.300483 d  (7.2116 h)

Star USNO-A2.0 1425-03090273

Variable type EW (W Ursae Majoris eclipsing) in the constellation of Perseus, discovered on 24/12/2017 and registered in AAVSO under code 000-BMP-731 . A phase diagram of 0-2 is shown in the graph.

  • Variable:                    USNO-A2.0 1425-03090273     

  • AAVSO UID:               000-BMP-731      

  • Constellation:           Perseus     

  • J2000.0:                     02 12 46.95 +55 17 50.5  (33.19562 +55.29736)    

  • Other names:          2MASS J02124695+5517506    UCAC4 727-019419    UNSO-B1.0 1452-0071419

  • Variability type:       EW    

  • Mag. range:             16.2 - 16.8 V    

  • Epoch:                      24 Dec 2017 (HJD 2458112.021)     

  • Period:                     0.341576: d  (8.1978 h)