38 Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 44m 57.57945s[1] |
| Declination | +12° 26′ 44.7297″[1] |
| Apparent magnitude (V) | +5.178[2] |
| Characteristics | |
| Spectral type | A7 III-IV[3] |
| U−B color index | +0.121[2] |
| B−V color index | +0.235[2] |
| Variable type | δ Sct[4] |
| Astrometry | |
| Radial velocity (Rv) | -1.5[5] km/s |
| Proper motion (μ) | RA: +120.49[1] mas/yr Dec.: -85.78[1] mas/yr |
| Parallax (π) | 27.52 ± 0.40[1] mas |
| Distance | 119 ± 2 ly (36.3 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.22[6] |
| Details | |
| Radius | 2.1[7] R☉ |
| Luminosity | 11[6] L☉ |
| Surface gravity (log g) | 4.04[6] cgs |
| Temperature | 7,638[6] K |
| Rotational velocity (v sin i) | 86[8] km/s |
| Age | 0.58[9] Gyr |
| Other designations | |
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,[11] forming part of the neighboring constellation of Cetus. With an apparent visual magnitude of +5.18,[2] it is bright enough to be viewed with the naked eye. The measured annual parallax shift of 27.52 mas[1] 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,[3] 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.[4] This star is larger than the Sun, with more than double the Sun's radius and 11 times the luminosity.[6] This energy is being radiated into outer space from the atmosphere at an effective temperature of 7,638 K,[6] giving it the white-hued glow of an A-type star.
References
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