DY Persei

DY Persei
Location of DY Persei (circled) near Trumpler 2 (Stellarium-generated image)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 02h 35m 17.127s[1]
Declination +56° 08′ 44.72″[1]
Apparent magnitude (V) 10.5 - 16.0[2]
Characteristics
Spectral type C5,4pJ:[3] C-R4+ C25.5[4]
B−V color index 1.79[5]
V−R color index 1.12[5]
J−H color index 0.185[6]
J−K color index 1.963[6]
Variable type DY Per[7]
Astrometry
Radial velocity (Rv)−38[8] km/s
Proper motion (μ) RA: +2.264[1] mas/yr
Dec.: −0.675[1] mas/yr
Parallax (π)0.6718 ± 0.0251 mas[1]
Distance1,500[9] pc
Absolute magnitude (MV)−2.5 (max)[7]
Details
Radius87[10] R☉
Luminosity522[11] L☉
Surface gravity (log g)0.0[12] cgs
Temperature2,900-3,100[12] K
Metallicity [Fe/H]−2.0 to −0.5[12] dex
Other designations
DY Persei, DY Per, 2MASS J02351713+5608446, AAVSO 0228+55, IRAS 02316+5555, TYC 3691-1782-1
Database references
SIMBADdata

DY Persei is a variable star and carbon star in the Perseus constellation. At maximum it is 11th magnitude and at its faintest it drops to 16th magnitude. DY Persei is the prototype of the very rare DY Persei class of variables that pulsate like red variables but also fade from sight like R Coronae Borealis variables.

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