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Adopt A Variable Star Program

The Adopt a Variable Star program supports the work of the AAVSO. Anyone can “adopt” a star listed in  Variable Star Index (VSX) for one year, for a donation of $30.00 US (tax-deductible in the US).

Alert Notice 571: Observations Requested of Exoplanet Proxima Centauri b

March 16, 2017: Dr. Karen Collins (Vanderbilt University) has requested ground-based, follow-up observations of recently discovered exoplanet Proxima Centauri b. This exoplanet is a suspected Earth-size planet orbiting in the habitable zone of our nearest stellar neighbor, Proxima Centauri (V645 Cen). There exists a rough ephemeris of this target based on radial velocity measurements, so the predicted mid-transit times can vary +/- 6 hours. Therefore, it is requested that observations be as long as possible.

Solar Bulletin - Volume 73, Number 02

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

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

Alert Notice 570: NR TrA (Nova TrA 2008) monitoring in support of XMM observations

March 7, 2017 : Dr. Fred Walter (Stony Brook University) has requested AAVSO observers' assistance in monitoring NR TrA (Nova TrA 2008) in support of upcoming XMM Newton observations. The XMM observations will take place 2017 March 13 06:21 through March 14 10:34 UT.

AAVSO Annual Report for 2015-2016 online

The AAVSO Annual Report for 2015-2016 has been published and is online. Both a high-resolution and a low-resolution version are available at https://www.aavso.org/annual-report.

Alert Notice 569: Monitoring 1SWASP J162117.36+441254.2 for HST observations

February 15, 2017: Dr. Elmé Breedt (University of Warwick) has requested AAVSO observers' assistance in monitoring the eclipsing cataclysmic variable 1SWASP J162117.36+441254.2 (=CSS_J162117.4+441254) beginning now in support of observations scheduled with the Hubble Space Telescope for late February - early March.

January 2017 Solar Bulletin

The January Solar Bulletin (Vol. 73, No. 1) is now available at https://www.aavso.org/solar-bulletin

The Sudden Ionispheric Disturbance (SID) Report for January is available here: https://www.aavso.org/sid-database

Alert Notice 568: Nova in Scorpius - PNV J16521887-3754189 [V1657 Sco]

February 13, 2017

Event: Nova in Scorpius  [V1657 Sco]

Discovered by: Hideo Nishimura (Shizuoka-ken, Japan)

Discovery magnitude: magnitude 11.7 (CCD, unfiltered)

Discovery date: 2017 February 1.862 UT

Coordinates (2000.0): R.A. 16 52 18.87  Decl. -37 54 18.9 (from discovery and VSX)

Alert Notice 567: IM Nor monitoring requested for HST COS observations

February 10, 2017: Dr. Ed Sion (Villanova University) and colleagues have requested AAVSO observers' assistance in monitoring the symbiotic-type recurrent nova IM Nor in support of observations with the Hubble Space Telescope Cosmic Origins Spectrograph scheduled for 2017 February 13 - 17 UT.

These observations are part of a study on short orbital period recurrent novae as Supernovae Type Ia progenitors.

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