DW Uma
Ursa Major · 11/04/2020 - 19:00 UTC · Officina Stellare Advanced RILA 400 f/5.25
About the target
NL / VY+E
NL
Nova-like stars. Cataclysmic variables where the mass transfer rate is above a certain limit and their accretion disks are stable because they are nearly fully ionized to their outer (tidal cut off) boundary and this condition suppresses dwarf nova outbursts. Also known as UX (UX Ursae Majoris stars).
VY
VY Scl subtype. They are cataclysmic binary systems with a hot (35,000-65,000 K) and luminous white dwarf that occasionally undergo fadings of more than 1 magnitude (up to several magnitudes) due to a low rate of mass transfer. These fadings might last from days to years. At maximum they vary up to 1 magnitude. They are usually nova-like variables that show no outbursts but some dwarf nnovae also show similar fadings. Orbital periods usually range between 0.12 and 0.18 d. Examples: VY Scl (opens in a new tab), MV Lyr (opens in a new tab).
'The Artistic Image above, reproduced courtesy of Mark A. Garlick / markgarlick.com (opens in a new tab). No unauthorized use".
© Nikos Paschalis
Observing log
- Object
- DW Uma
- Constellation
- Ursa Major
- V. Magnitude + Variability
- 13.6-18.0 V / NL/VY+E
- RA / DEC
- 10h:33m.53sec / +58°46m.55sec
- Period
- 0.1366065324 days
- Comparison star
- GSC 3822:1157
- Check star
- GSC 3822:983
- Date + Time
- 11/04/2020 - 19:00 UTC
- Location
- “Nunki Observatory” - Skiathos
- Optics
- Officina Stellare Advanced RILA 400 f/5.25
- Tools
- THE SKY X
- Camera
- SBIG STXL11002 with FW8G-STXL (Astrodon filters)
- Exposure Time
- Rc: 5.3 Hours
- Mount
- Paramount ME
- Guiding
- Unguided
- Processing Details
- ACP, Muniwin
- More Details
- Environment Temperature: 13 °C Camera Temperature -25 °C
- Sky temperature
- 12.0. οC
- Notes
- Weather: Clear Transparence: Medium Humidity: 75-85%
- Moon Illumination
72%