March 13, 2015: Dr. George Rieke (University of Arizona) and colleagues have requested AAVSO assistance in monitoring four stars with developing planetary systems. The targets are RZ Psc, HD 15407A, V488 Per, and HD 23514. This campaign is similar to the one conducted in 2013 (see AAVSO Alert Notice 482).
Dr. Rieke writes: "We have obtained 130 hours of time on the Spitzer Space Telescope to continue monitoring planetary debris disks for variability. We are asking for help from AAVSO for this program.
New Variable Stars Discovered by the APACHE Survey. II. Results After the Second Observing Season
INAF-Astrophysical Observatory of Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy; Astronomical Observatory of the Autonomous Region of the Aosta Valley, fraz. Lignan 39, 11020 Nus (Aosta), Italy
March 5, 2015: The AAVSO is requesting observations of the symbiotic nova candidate ASAS J174600-2321.3 during the predicted upcoming eclipse of this system. Observers are asked to begin observing immediately (2015 March 5), and continue observations through the end of July 2015. Both visual and instrumental observations are encouraged; the object was at V=12.28 on 2015 February 6.764 (OCN; S.
AAVSO Communications was launched in March 2015. The purpose of this monthly email is to highlight new initiatives and ongoing projects in a concise way which we hope you will find informative. Sometimes there is just so much going on that it is hard to keep track of it all. We hope that AAVSO Communications will make it easier for you to see what is happening and follow the links to read more about what interests you.
AAVSO Bulletin 78 - Predicted Dates of Maxima and Minima of 380 Long Period Variables for 2015 has been published.
The Bulletin is an essential aid in planning your LPV observing program! Generate a custom version of the Bulletin tailored to your observing needs, or download the Bulletin in PDF or CSV format. Find a list of legacy LPVs in need of observation here as well.
Arlo Landolt should be familiar to most of the AAVSO community, not only as a friend and former councillor of the AAVSO, but as one of the leading figures of astronomical photometry and photometric calibrations. Arlo Landolt's work on standard stars has set the standard -- very literally -- for astronomical photometry for nearly half a century.
- Nishimura: DSLR magnitude 11.2, using 200-mm f/3.2 lens + digital camera
- Nishiyama and Kabashima: unfiltered CCD magnitude 10.9, using a 105-mm f/4 camera lens (+SBIG STL6303E camera)