26 Vulpeculae

26 Vulpeculae
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]
Distance644 ± 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
Radius4.6[6] R☉
Luminosity79.75[7] L☉
Temperature7,888[7] K
Rotational velocity (v sin i)15[8] km/s
Other designations
26 Vul, BD+25°4299, HD 196362, HIP 101641, HR 7874, SAO 88884[9]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Pourbaix2004 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference CADARS was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Simbad was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Renson2009 was invoked but never defined (see the help page).