38 Arietis

38 Arietis

Four visual band light curves for 38 Arietis, adapted from Valtier et al. (1974)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 44m 57.57945s[2]
Declination +12° 26′ 44.7297″[2]
Apparent magnitude (V) +5.178[3]
Characteristics
Spectral type A7 III-IV[4]
U−B color index +0.121[3]
B−V color index +0.235[3]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)-1.5[6] km/s
Proper motion (μ) RA: +120.49[2] mas/yr
Dec.: -85.78[2] mas/yr
Parallax (π)27.52 ± 0.40 mas[2]
Distance119 ± 2 ly
(36.3 ± 0.5 pc)
Absolute magnitude (MV)2.22[7]
Details
Radius2.1[8] R☉
Luminosity11[7] L☉
Surface gravity (log g)4.04[7] cgs
Temperature7,638[7] K
Rotational velocity (v sin i)86[9] km/s
Age0.58[10] Gyr
Other designations
UV Arietis, BD+11° 377, HD 17093, HIP 12832, HR 812, SAO 93083.[11]
Database references
SIMBADdata

38 Arietis (abbreviated 38 Ari) is a variable star in the northern constellation of Aries. 38 Arietis is the Flamsteed designation. It was once designated 88 Ceti,[12] forming part of the neighboring constellation of Cetus. With an apparent visual magnitude of +5.18,[3] it is bright enough to be viewed with the naked eye. The measured annual parallax shift of 27.52 mas[2] is equivalent to a distance of approximately 119 light-years (36 parsecs) from Earth.

The spectrum of this star matches a stellar classification of A7 III-IV,[4] with the luminosity class of III-IV indicating it shows traits part way between the subgiant and giant star stages of its evolution. It is a Delta Scuti variable with a period of 0.0355 days (51 minutes) and a magnitude change of 0.040.[5] This star is larger than the Sun, with more than double the Sun's radius and 11 times the luminosity.[7] This energy is being radiated into outer space from the atmosphere at an effective temperature of 7,638 K,[7] giving it the white-hued glow of an A-type star.

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