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2018 JD Calendar is now available

The 2018 Julian Day calendar is now available for viewing or downloading.

Alert Notice 608: TT Ari monitoring requested for VLA observations

December 1, 2017: Dr. Deanne Coppejans (Northwestern University) and colleagues have requested AAVSO assistance in monitoring the cataclysmic variable TT Ari in support of observations scheduled to be made with the Very Large Array (VLA) in December 2017.

Dr. Coppejans writes:

Alert Notice 607: MASTER OT J132104.04+560957.8 photometry urgently needed for XMM observations

December 1, 2017: Dr. Mark Kennedy (Jodrell Bank Centre for Astrophysics, University of Manchester) requests AAVSO observers' assistance in providing optical coverage of the polar MASTER OT J132104.04+560957.8 in support of observations with the XMM-Newton satellite scheduled for this Sunday, 2017 December 3, 08:35:31 UT - 16:38:51 UT.

The XMM-Newton observations themselves will not include an optical component, so photometry provided by AAVSO observers is essential for the interpretation of the X-ray data.

Alert Notice 606: Observing campaign on nova in Vela - ASASSN-17mt

November 17, 2017

Event: Nova in Vela (ASASSN-17mt) and associated observing campaign

Discovered by: ASAS-SN (K. Z. Stanek (Ohio State University) et al.; ATel #10772)

Discovery magnitude: V=11.3, using data from the quadruple 14-cm "Cassius" telescope at CTIO, Chile

Discovery date: 2017 September 24.39 UT

Coordinates (2000.0): R.A. 08 50 29.62   Decl. -47 45 28.3 (from VSX)

Solar Bulletin - Volume 73, Number 10

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

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

Alert Notice 605: Nova in Ophiuchus - PNV J17184504-2454221

November 14, 2017

Event: Nova in Ophiuchus

Discovered by: Shizuo Kaneko (Kakegawa, Shizuoka-ken, Japan)

Discovery magnitude: magnitude 9.4 (CCD, unfiltered, using using Canon 6D digital camera + f/3.2 200-mm lens)

Solar Observing Guide update

The Solar Observing Guide has just been updated. You can download the latest version (1.1) here:

https://www.aavso.org/solar-observing-guide

Many thanks to Frank Dempsey and Raffaello Braga along with Rodney Howe and Kristine Larsen for their excellent contributions to this revised edition.

Alert Notice 604: CI Aql observations must be reported by 14:45 UT 2017 November 1

October 31, 2017: Further to AAVSO Alert Notice 603, your positive observations of CI Aql, which will be used to determine whether the HST observation of CI Aql will take place, must be submitted to the AAVSO International Database by 14:45 UT (10:45 am EDT) on Wednesday, 2017 November 1. Without these positive ground-based observations reported by this time (and showing CI Aql not in outburst), the HST observation will not take place.

Alert Notice 603: CI Aql HST observation scheduled for November 2

October 27, 2017 : Further to AAVSO Alert Notice 599, Dr. Edward Sion (Villanova University) informs us that the HST COS observation of the recurrent nova CI Aql has been scheduled for November 2, 2017.

Alert Notice 602: CE Tau Observations Requested to Supplement BRITE-Constellation

October 17, 2017BRITE-Constellation (http://www.brite-constellation.at), a network of nano-satellites, is currently taking photometric observations of  the Taurus field (full target list and field specifications given http://brite.craq-astro.ca/doku.php?id=taui).  Within this field is CE Tau, a red supergiant with significant (0.5 mag) variations over timescales of months. Dr.

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