DM Lyrae

DM Lyrae (DM Lyr for short) is a dwarf nova in the constellation Lyra. This binary system is composed of a primary star of unknown type, and a white dwarf companion. It erupted in 1928 and 1996 and reached about magnitude 13.^[1]

DM Lyrae

A visual band light curve for DM Lyrae, adapted from Nogami et al. (2003).[1] The inset plot shows the superhump variations.
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Lyra
Right ascension	18h 58m 44.43s[2]
Declination	+30° 15′ 33.0″[2]
Apparent magnitude (V)	+18 (quiet), +13.6 (burst)[2]
Characteristics
Spectral type	? / White dwarf
Variable type	SU UMa[1]
Orbit[3]
Period (P)	0.0654092±0.000002 d
Periastron epoch (T)	2,451,343.8565±0.0015 HJD
Semi-amplitude (K1) (primary)	37±5 km/s
Details
Donor star
Mass	0.095±0.022[4] M☉
Radius	0.145±0.011[4] R☉
Other designations
Lyr 1928, AN 250.1929, 1RXS J185845.1+301548, AAVSO 1854+30, DM Lyr[5]
Database references
SIMBAD	data

See also

• RS Ophiuchi
• HR Lyrae
• V838 Monocerotis