Nova Sgr 2015 No. 2 fading as dust production rises
Abstract:
Nova Sgr 2015 No. 2 (V5668 Sgr, PNV J18365700-2855420; see AAVSO Alert Notice 512) is undergoing a significant fading visually as its infrared excess increases, indicating that substantial dust production is underway. Nova Sgr 2015 No. 2 was discovered by John Seach (Chatsworth Island, NSW, Australia) at DSLR magnitude 6.0 on 2015 March 15.634 UT. It brightened to V=4.3 by March 21, and has undergone five subsequent re-brightenings, the last to V=5.7 on June 1. Since then it has faded steadily to V=8.2 on June 15, 1.6 magnitudes fainter than its faintest previous minimum since outburst. For a light curve of observations in the AAVSO International Database, see below. The Spitzer Space Telescope may observe this classical nova if it can be diverted from its current mode and target. Several professional astronomers are planning observations with other instrumentation.
Justification:
Photometry and visual observations, spectroscopy, and polarimetry are strongly encouraged. Near-infrared observations (J and H bands) would be particularly helpful.
Requested Data Types:
Photometry, Spectroscopy
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| V5668 Sgr | 4.30 | NA |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
No photometry filters provided
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Forum URL
N/A
Notes:
Principal Investigator: John Seach; Imported Campaign (Alert Notice #519)