Skip to main content

front page news

All nodes that have this tag will posted to the home page "Recent Activity" block

Alert Notice 644: FO Aqr monitoring requested in faint-state study

July 27, 2018: Dr. Colin Littlefield (University of Notre Dame) writes:

"In both 2016 and 2017, my colleagues and I requested AAVSO campaigns on the intermediate polar FO Aquarii to study its first-ever faint states. In both campaigns, we were delighted with both the quality and quantity of the data that we received from AAVSO observers [AAVSO Alert Notices 545, 598).

Alert Notice 643: Monitoring for Red Dots #2 campaign

July 25, 2018: John Strachan (Ph.D. candidate, Queen Mary University of London) and Dr. Guillem Anglada-Escude (Queen Mary University of London) have requested AAVSO assistance in the monitoring of three M dwarf stars as part of the Red Dots #2 campaign.

Alert Notice 642: ASASSN-18pe observing campaign

July 24, 2018: Dr. Matt Darnley (Astrophysics Research Institute, Liverpool John Moores University) and the AAVSO are requesting monitoring of ASASSN-18pe, the cataclysmic variable (possible long period dwarf nova) discovered 2018 July 10 by the ASAS-SN program (J. Strader et al. ATel #11867) at magnitude V = 15.8.

Alert Notice 641: V1490 Cyg multiwavelength campaign

July 24, 2018: Dr. Dirk Froebrich (University of Kent) has requested AAVSO observations to support their upcoming observations of V1490 Cyg. He writes:

"Background: We have recently discovered that the young star V1490 Cyg (situated in the Pelican Nebula IC 5070) is periodically occulted by material in its circumstellar disk(*). Our light-curves indicate a period of about 32 days, and the obscurations are comparable to UX-Ori type eclipses.

Solar Bulletin - Volume 74, Number 06

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

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

Alert Notice 640: Immediate Monitoring of VW Hyi Requested

July 5, 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

A Carbon Star

Summary

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.

Pages

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484