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LPV of the Month

S Cassiopieae

S Cas is an interesting Mira star that has been observed by AAVSO observers and members since 1865.  Over 21,000 observations are in the AID from over 700 different observers as can be seen in the light curve shown below which displays all observations in the AID. It is one of the Legacy LPV Program stars.  It is a star with good observational coverage, being visible almost year round with minimal seasonal gaps. 

Alert Notice 628: HST observations scheduled for SDSS J153817.35+512338.0

March 29, 2018: Further to AAVSO Alert Notice 618, Anna Pala (Ph.D. candidate, University of Warwick) informs us that the date and time of the HST observations planned for the faint polar cataclysmic variable SDSS J153817.35+512338.0 have been set for

2018 April 6 17:33:26 - 21:33:19 UT

Alert Notice 627: Nova in Canis Major - N CMa 2018 = TCP J07134590-2112330

March 26, 2018

Event: Nova in Canis Major - Nova CMa 2018 = TCP J07134590-2112330

Discovered by: Yuji Nakamura (Kameyama, Mie, Japan) (reported to CBAT by M. Soma, National Astronomical Observatory of Japan)

Discovery magnitude: CCD magnitude 12.0, using a 10-cm f/3 reflector

Discovery date: 2018 March 24.496 UT

Coordinates (2000.0): R.A. 07 13 45.84  Decl. -21 12 31.3  (from VSX)

Alert Notice 626: Bright nova in Carina - ASASSN-18fv

March 21, 2018

Event: Nova in Carina - ASASSN-18fv

Discovered by: All Sky Automated Survey for SuperNovae (ASAS-SN)

Discovery magnitude: brighter than magnitude 10 V (image was saturated)

Discovery date: 2018 March 20.32 UT

Coordinates (2000.0): R.A. 10 36 13.71  Decl. -59 35 55.1  (from VSX)

Alert Notice 625: ASASSN-18ey = MAXI J1820+070 coverage needed for VLT and XMM

March 21, 2018: Dr. Tom Maccarone (Texas Tech University) has requested AAVSO observers' assistance in monitoring the outbursting black hole X-ray binary ASASSN-18ey = MAXI J1820+070 in support of VLT and XMM observations scheduled for:

2018 22 March 08-09:30 UT  and  29 March 08-09:30 UT

V time series are requested, with as short a cadence as possible (ideally, a time resolution of 0.1 second or better).

Alert Notice 624: Observations requested for ASASSN-18ey = MAXI J1820+070

March 19, 2018: Drs. Gregory Sivakoff (University of Alberta), Poshak Gandhi (University of Southampton), and Diego Altamirano (University of Southampton) have requested AAVSO observers' assistance in monitoring the new black hole X-ray binary candidate ASASSN-18ey = MAXI J1820+070.