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Alert Notice 640: Immediate Monitoring of VW Hyi Requested

July 5th, 2018  Dr. Christian Knigge has requested immediate monitoring of the  SU Uma-type dwarf Novae VW Hyi in order to promptly identify the next outburst. This outburst will trigger radio wavelength observations. As this object has never been detected in the radio, it is imperative that the radio observations be started as soon after outburst as possible to have the best chance of detection. 

AAVSO Newsletter 77 is online

AAVSO Newsletter Number 77 (July 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 78, October 2018) is published.

Alert Notice 639: CH Cyg coverage requested

July 3, 2018: The symbiotic variable CH Cyg is undergoing a fade that began on June 25. Multicolor photometry is requested; V and particularly B should take priority over Rc and Ic. Observations made two to three times a week are sufficient; time series observations are not needed. Visual observations are also requested and encouraged. Spectroscopy would be very welcome and appreciated. Coverage should continue throughout the observing season.

Alert Notice 638: Nova in Scutum - N Sct 2018 = TCP J18292290-1430460

July 2, 2018

Event: Nova in Scutum - N Sct 2018 = TCP J18292290-1430460

Discovered by: Yukio Sakurai (Mito, Japan)

Discovery magnitude: unfiltered CCD magnitude 10.3, on two frames using Nikon D7100 digital camera + 180-mm f/2.8 lens

Discovery date: 2018 June 29.5768 UT

Coordinates (2000.0): R.A. 18 29 22.93   Decl. -14 30 44.2  (from VSX)

LPV of the Month July, 2018

SS Virginis (Virgo)

A Carbon Star


This month's Long Period Variable (LPV), SS Vir, should be a treat for visual observers. SS Vir is a bright but very dark red Carbon Star.  It’s B-V index is 4.20, making it one of the reddest object around.

JAAVSO volume 46, number 1, June 2018, print version now available


The Journal of the American Association of Variable Star Observers
Volume 46, Number 1, 2018

The printed version of this issue is now available from Createspace via the link below.

Volume 46, Number 1, 2018


Solar Bulletin - Volume 74, Number 05

The May Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:

The May SID Data report is available here:

JAAVSO Volume 46 Number 1 2018 is published


The printed version of this issue will be available soon. Please watch for the announcement on our main web page.

The Journal of the American Association of Variable Star Observers
Volume 46, Number 1, 2018

Articles in This Issue

Alert Notice 637: Nova in Lupus - N Lup 2018 = PNV J15384000-4744500

June 5, 2018

Event: Nova in Lupus - N Lup 2018 = PNV J15384000-4744500

Discovered by: Rob Kaufman (Bright, Victoria, Australia) at White Cliffs, NSW, Australia (via CBET 4520)

Discovery magnitude: 9.1 unfiltered CCD magnitude, object visible in 5 DSLR frames taken with 55mm lens (via CBET 4520)

Discovery date: 2018 June 03.4306 UT (via CBET 4520)


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