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Solar Bulletin - Volume 74, Number 03

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

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

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)

AAVSO Newsletter 76 online

AAVSO Newsletter Number 76 (April 2018) has been published and is online. AAVSO members may download a high- or low-resolution version from here. This issue will be available to non-members when the next issue (Number 77, July 2018) is published.

LPV of the Month April, 2018

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)

AAVSO Annual Report for 2016-2017 online

The AAVSO Annual Report for 2016-2017 has been published and is online. Both a high-resolution and a low-resolution version are available at https://www.aavso.org/annual-report.

Solar Observing Guide in Portuguese

Thanks to observer and volunteer, Alexandre Amorim from Brazil, we now have available a Portuguese translation of the AAVSO Solar Observing Guide available for download (free-of-charge). This helpful Guide explains how to observe and report sunspot counts in a safe and scientifically useful manner.

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)

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