Tau8 Serpentis, Latinized from τ8 Serpentis, is an A-type main sequence star in the constellation of Serpens, approximately 364 light-years from the Earth.[5] It has an apparent visual magnitude of approximately 6.144.[5] Although it was observed to be binary by speckle interferometry in 1985, subsequent observations show no sign of binarity, and the detection appears to have been spurious.[8]
Quick facts Constellation, Right ascension ...
Tau8 Serpentis
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS) |
| Constellation |
Serpens[1] |
| Right ascension |
15h 44m 42.1323s[2] |
| Declination |
+17° 15′ 51.199″[2] |
| Apparent magnitude (V) |
6.1[3] |
| Characteristics |
| Evolutionary stage |
main sequence[4] |
| Spectral type |
A0V[5] |
| U−B color index |
−0.03[6] |
| B−V color index |
0.00[6] |
| Astrometry |
|---|
|
|---|
| Radial velocity (Rv) | −7.47±0.53[2] km/s |
| Proper motion (μ) | RA: −28.655[2] mas/yr
Dec.: +4.476[2] mas/yr |
| Parallax (π) | 8.9643±0.0409 mas[2] |
| Distance | 364 ± 2 ly
(111.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.88[1] |
|
|---|
| Details |
|---|
|
|---|
| Mass | 2.5[7] M☉ |
| Radius | 2.3[7] R☉ |
| Luminosity | 44[7] L☉ |
| Surface gravity (log g) | 4.09[7] cgs |
| Temperature | 9,727[7] K |
| Rotational velocity (v sin i) | 117[4] km/s |
|
|---|
| Other designations |
|---|
| τ8 Ser, Tau8 Ser, 26 Serpentis, BD+17°2906, GC 21164, HD 140729, HIP 77111, HR 5858, SAO 101712, PPM 131656[5] |
| Database references |
|---|
| SIMBAD | data |
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