G 185-32, also known by the variable star designation PY Vulpeculae, is a white dwarf in the constellation Vulpecula. Located approximately 18.3 parsecs (60 ly) distant,[2] the stellar remnant is a ZZ Ceti variable, varying by 0.02 apparent magnitudes from the mean of 13.00.[3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 19h 37m 13.7502s[2] |
Declination | +27° 43′ 18.7366″[2] |
Apparent magnitude (V) | 13.00[3] |
Characteristics | |
Spectral type | DA4.0[4] |
Apparent magnitude (J) | 13.183±0.023[5] |
Apparent magnitude (H) | 13.213±0.029[5] |
Apparent magnitude (K) | 13.329±0.043[5] |
B−V color index | 0.17 |
Variable type | ZZA[3] |
Astrometry | |
Proper motion (μ) | RA: 439.597±0.044[2] mas/yr Dec.: 21.270±0.049[2] mas/yr |
Parallax (π) | 54.7742 ± 0.0288 mas[2] |
Distance | 59.55 ± 0.03 ly (18.257 ± 0.010 pc) |
Absolute magnitude (MV) | 11.66 |
Details[6] | |
Mass | 0.64±0.10 M☉ |
Radius | 0.0120±0.0006 R☉ |
Surface gravity (log g) | 8.09±0.05 cgs |
Temperature | 12381±186 K |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
This star was first noticed during a survey for high proper motion stars by Henry L. Giclas, at Lowell Observatory, who listed it as a suspected white dwarf.[7] The white dwarf designation was confirmed spectroscopically in 1970 by astronomer Jesse L. Greenstein of the California Institute of Technology.[8]