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Alert Notice 618: Monitoring SDSS J153817.35+512338.0 for HST observations

March 5, 2018: Anna Pala (Ph.D. candidate, University of Warwick) has requested AAVSO observers' assistance in monitoring the faint polar cataclysmic variable SDSS J153817.35+512338.0 in support of Hubble Space Telescope observations scheduled for late March-early April 2018.

The HST observing window is 2018 March 28 - April 9. Once the exact time of the HST observations is known, it will be announced on the AAVSO discussion forum thread for this campaign given below.

Alert Notice 617: Multiwavelength observations of YZ Cnc, SU UMa, and CR Boo outbursts

March 5, 2018: Bob Jacobs (Ph.D. candidate, Radboud University) and Drs. Samaya Nissanke (Radboud University), Jennifer Barnes (Columbia University), and Deanne Coppejans (Northwestern University) have requested AAVSO observers' assistance in monitoring the cataclysmic variables YZ Cnc, SU UMa, and CR Boo. The goal is to build good multicolor light curves of two outbursts of CR Boo and two superoutbursts each of YZ Cnc and SU UMa.

LPV of the Month March, 2018

V Bootis

V Boo is an interesting semiregular star that has been observed by AAVSO observers and members since 1904 (a single observation is recorded in 1893).  Over 75,000 observations are in the AID from over 2,000 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.

AAVSO Bulletin 81 for 2018 published

AAVSO Bulletin 81: Predicted Dates of Maxima and Minima of Long Period Variables for 2018 has been published. This annual publication covers the period January 2018 - February 2019 and gives predicted extrema dates for 381 Long Period Variables in the AAVSO's Legacy LPV program.

 

Solar Observing Guide in Spanish

Thanks to the excellent work of our own Sebastián Otero, we now have a Spanish translation of the AAVSO Solar Observing Guide available for download free-of-charge. In addition to Spanish, this Guide is also available in French and German (and soon Italian).

If you would like to translate the AAVSO Solar Observing Guide or any of the other AAVSO observing manuals or guides into your own native language, please contact AAVSO staff member Sara Beck.

AAVSO Alert Notice 616: Nova Sco 2018 No. 2 = PNV J16484962-4457032

February 13, 2018

Event: Nova in Scorpius: Nova Sco 2018 No. 2 = PNV J16484962-4457032

Discovered by: Hideo Nishimura (Kakegawa, Shizuoka-ken, Japan, reported by S. Nakano, Sumoto, Japan, via CBET 4488)

Discovery magnitude: unfiltered CCD magnitude 11.7 (on five frames using a Canon EOS 6D digital camera+200-mm-f.l. f/3.2 lens)

Discovery date: 2018 February 6.863 UT
 
Coordinates (2000.0): R.A. 16 48 49.62  Decl. -44 57 03.2

Alert Notice 615: ASASSN-18ca = PNV J00423439+4044255 - Probable Nova in M31

February 12, 2018

Event: Probable Nova in M31: ASASSN-18ca = PNV J00423439+4044255

Discovered independently by:
- Koichi Itagaki (Yamagata, Japan; reported via CBAT TOCP)
- All Sky Automated Survey for SuperNovae (ASAS-SN) (reported by J. Brimacombe et al. in ATel #11275)

Alert Notice 614 : Monitoring of GW Lib to support XMM-Newton observation

February 12, 2018: Dr. Koji Mukai (NASA Goddard Space Flight Center) and colleagues have requested AAVSO observations of the WZ Sge type dwarf nova GW Lib in support of observations with the ESA XMM-Newton spaceobservatory scheduled for

2018 February 17  05:46:41 - 21:36:41 UT

Solar Bulletin - Volume 74, Number 1

The January Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The January SID Data report is available here: https://www.aavso.org/sid-database

Alert Notice 613: Nova Cir 2018 - PNV J13532700-6725110

January 31, 2018

Event: Nova in Circinus  -  Nova Cir 2018 = PNV J13532700-6725110

Discovered by: John Seach (Chatsworth Island, NSW, Australia)

Discovery magnitude: 9.1 unfiltered CCD (on three images, using DSLR with 50 mm f/1.2 lens)

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