HR 6875
Star in the constellation Corona Australis
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HR 6875, previously known as Sigma Telescopii, is a single[10] star in the constellation Corona Australis. It has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.24.[1] This object is located at a distance of approximately 590 light years from the Sun based on parallax.[2] It is listed as a member of the Sco OB2 association.[7]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Australis[1] |
| Right ascension | 18h 24m 18.23949s[2] |
| Declination | −44° 06′ 36.9186″[2] |
| Apparent magnitude (V) | 5.24[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B3 V[3] |
| B−V color index | −0.163±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | +0.00±7.40[1] km/s |
| Proper motion (μ) | RA: −1.659[2] mas/yr Dec.: −22,022[2] mas/yr |
| Parallax (π) | 5.5671±0.1134 mas[2] |
| Distance | 590 ± 10 ly (180 ± 4 pc) |
| Absolute magnitude (MV) | −0.63[1] |
| Details | |
| Mass | 4.5[4] M☉ |
| Radius | 3.9[2] R☉ |
| Luminosity | 389[4] L☉ |
| Surface gravity (log g) | 4.43[5] cgs |
| Temperature | 15,803[5] K |
| Rotation | 27.2 days[6] |
| Rotational velocity (v sin i) | 248±12[7] km/s |
| Age | 103[8] Myr |
| Other designations | |
| CD−44°12569, FK5 3461, HD 168905, HIP 90200, HR 6875, SAO 228982, WDS J18243-4407A[9] | |
| Database references | |
| SIMBAD | data |
This is a hot B-type main-sequence star with a stellar classification of B3 V.[3] It is around 103[8] million years old and is spinning rapidly with a projected rotational velocity of 248 km/s or perhaps higher.[7] The star has 4.5 times the mass of the Sun[4] and about four times the Sun's radius.[2] It is radiating nearly 400 the luminosity of the Sun[4] from its photosphere at an effective temperature of 15,803 K[5]
A magnitude 10.13 visual companion is located at an angular separation of 74″ along a position angle of 162°.[11]