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Star in the constellation Auriga From Wikipedia, the free encyclopedia
Psi4 Aurigae, Latinized from ψ4 Aurigae, is a single,[9] orange-hued star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of +5.02.[2] With an annual parallax shift of 10.08 ± 0.33 mas,[1] it is approximately 324 light-years (99 parsecs) distant from Earth.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Auriga |
Right ascension | 06h 43m 04.97107s[1] |
Declination | +44° 31′ 28.0220″[1] |
Apparent magnitude (V) | +5.02[2] |
Characteristics | |
Spectral type | K5 III[3] |
U−B color index | +1.83[2] |
B−V color index | +1.48[2] |
Astrometry | |
Radial velocity (Rv) | −77.35±0.23[4] km/s |
Proper motion (μ) | RA: −45.43[1] mas/yr Dec.: −29.97[1] mas/yr |
Parallax (π) | 10.08 ± 0.33 mas[1] |
Distance | 320 ± 10 ly (99 ± 3 pc) |
Absolute magnitude (MV) | +0.06[5] |
Details | |
Radius | 24.9[6] R☉ |
Luminosity | 155[6] L☉ |
Surface gravity (log g) | 2.04±0.24[7] cgs |
Temperature | 4,085±125[6] K |
Metallicity [Fe/H] | 0.10±0.08[7] dex |
Rotational velocity (v sin i) | 4.8[4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is a K-type giant star with a stellar classification of K5 III.[3] It has expanded to 25 times the Sun's radius and is radiating 155 times the Sun's luminosity from its photosphere at an effective temperature of about 4,158 K.[6] The atmosphere displays a significant enhancement of silicon.[10]
It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).
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