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Binary star system in the constellation Vulpecula From Wikipedia, the free encyclopedia
26 Vulpeculae is a close binary star[5] system in the northern constellation of Vulpecula,[9] around 644 light years away from the Sun.[1] It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.40.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −63 km/s,[4] and is expected to come within 225 light-years in around 2.6 million years.[2]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 36m 08.3399s[1] |
Declination | +25° 52′ 57.5615″[1] |
Apparent magnitude (V) | 6.40[2] |
Characteristics | |
Spectral type | A5 III[3] |
B−V color index | 0.158±0.005[2] |
Astrometry | |
Radial velocity (Rv) | −63.4±2.3[4] km/s |
Proper motion (μ) | RA: +26.010[1] mas/yr Dec.: +12.189[1] mas/yr |
Parallax (π) | 5.0684 ± 0.0346 mas[1] |
Distance | 644 ± 4 ly (197 ± 1 pc) |
Absolute magnitude (MV) | −0.04[2] |
Orbit[5] | |
Period (P) | 11.088 d |
Eccentricity (e) | 0.28 |
Periastron epoch (T) | 2,426,492.6090 JD |
Argument of periastron (ω) (secondary) | 50.1° |
Semi-amplitude (K1) (primary) | 58.7 km/s |
Details | |
Radius | 4.6[6] R☉ |
Luminosity | 79.75[7] L☉ |
Temperature | 7,888[7] K |
Rotational velocity (v sin i) | 15[8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is a single-lined spectroscopic binary with an orbital period of 11 days and an eccentricity of 0.28.[5] The visible component is a suspected chemically peculiar star[10] with a stellar classification of A5 III,[3] suggesting this is an evolved giant star. It has about 4.6[6] times the Sun's radius and is radiating 80 times the Sun's luminosity from its photosphere at an effective temperature of 7,888 K.[7]
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