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AAVSO International Database

Alert Notice 632: Fast photometry of symbiotic candidates requested

April 25, 2018: Dr. Jeno Sokoloski (Columbia University) and Mx. Adrian Lucy (graduate student, Columbia University) have requested AAVSO observations in support of a search underway by Mx. Lucy for symbiotic stars.

Alert Notice 631: Coverage requested for current outburst of AG Dra

April 24, 2018: Drs. Jaroslav Merc and Rudolf Gális (both of the Pavel Jozef Šafárik University (Slovakia)), on behalf of their scientific team, have requested AAVSO assistance in observing the symbiotic variable AG Dra as a follow-up to spectroscopic observations and in order to monitor the system in its current outburst, which began in early April.

Alert Notice 630: Coverage needed TONIGHT for ASASSN-18ey = MAXI J1820+070

April 11, 2018: Dr. Gregory Sivakoff (University of Alberta), on behalf of a large number of collaborators, has requested AAVSO observers' assistance in monitoring the outbursting black hole X-ray binary ASASSN-18ey = MAXI J1820+070 in support of a multiwavelength "blitz" campaign taking place tonight and into tomorrow.

Alert Notice 629: Nova in Sagittarius - N Sgr 2018 = PNV J18040967-1803581

April 11, 2018

Event: Nova in Sagittarius - N Sgr 2018 = PNV J18040967-1803581

Discovered independently by:
- Tadashi Kojima (Tsumagoi, Gunma-ken, Japan; reported to CBAT by S. Nakano)
- Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan; reported to CBAT by S. Nakano)
- Yuji Nakamura (Kameyama, Mie, Japan; reported to CBAT by M. Soma)

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).

Please see AAVSO Alert Notice 624 for more information about this object.

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.

Alert Notice 623: Observations of V1017 Sgr requested

March 16, 2018: Dr. Jennifer Sokoloski (Columbia University) and colleagues (led by Dr. Koji Mukai, NASA Goddard Space Flight Center) have requested AAVSO assistance in observing the nova/dwarf nova V1017 Sgr in preparation for an XMM-Newton observation scheduled for 2018 March 23 or 24.

Confirmation that the system is not in dwarf-nova outburst as of March 23 is needed so that the XMM observation may take place.

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