53 Persei

This article is about d Persei and is not to be confused with δ (delta) Persei.

53 Persei is a single^[12] variable star in the northern constellation of Perseus. It has the Bayer designation d Persei, while 53 Persei is the Flamsteed designation. The star is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.80.^[2] It is located approximately 480 light years away from the Sun, as determined from parallax, and is drifting further away with a radial velocity of +7.3 km/s.^[6]

A visual band light curve for V469 Persei, plotted from data published by Huang et al. (1994)^[13]

53 Persei

Location of 53 Persei (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Perseus
Right ascension	04h 21m 33.16651s[1]
Declination	+46° 29′ 55.9591″[1]
Apparent magnitude (V)	4.80[2]
Characteristics
Spectral type	B4IV[3]
U−B color index	−0.52[4]
B−V color index	−0.03[4]
Variable type	SPB[5]
Astrometry
Radial velocity (Rv)	+7.30[6] km/s
Proper motion (μ)	RA: +21.482[1] mas/yr Dec.: −34.832[1] mas/yr
Parallax (π)	6.8517±0.2700 mas[1]
Distance	480 ± 20 ly (146 ± 6 pc)
Absolute magnitude (MV)	−1.42[7]
Details
Mass	5.9±0.1[8] M☉
Radius	3.98±0.49[7] R☉
Luminosity	779.8+213.3 −167.5[7] L☉
Surface gravity (log g)	3.93±0.09[7] cgs
Temperature	16,720[9] K
Rotational velocity (v sin i)	15[10] km/s
Age	50.1±9.3[8] Myr
Other designations
d Per, 53 Per, V469 Per, NSV 1560, BD+46°872, FK5 2319, GC 5256, HD 27396, HIP 20354, HR 1350, SAO 39483[11]
Database references
SIMBAD	data

This star has a stellar classification of B4IV,^[3] and was the prototype of a class of variable stars known as slowly pulsating B stars.^[14] It was one of the first mid-B type variable stars in the northern hemisphere to be studied.^[5] The star undergoes non-radial pulsations with a primary period of 2.36 days. Observation of the star with the BRITE satellite revealed eight separate frequencies in the star's light curve.^[5]

53 Persei is around 50^[8] million years old with a projected rotational velocity of 15 km/s.^[10] It has six^[8] times the mass of the Sun and four^[7] times the Sun's radius. The star is radiating 780^[7] times the luminosity of the Sun from its photosphere at an effective temperature of 16,720 K.^[9]