HR 7135

HR 7135
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 18h 55m 27.46151s[1]
Declination +06° 36′ 55.1499″[1]
Apparent magnitude (V) 5.57[2]
Characteristics
Spectral type G9 III[3]
U−B color index +0.87[2]
B−V color index +1.041±0.002[4]
Astrometry
Radial velocity (Rv)23.31±0.09[5] km/s
Proper motion (μ) RA: +7.972[1] mas/yr
Dec.: –92.211[1] mas/yr
Parallax (π)11.5405 ± 0.1636 mas[1]
Distance283 ± 4 ly
(87 ± 1 pc)
Absolute magnitude (MV)0.87[4]
Orbit[5][6]
PrimaryHR 7135 A
CompanionHR 7135 B
Period (P)2,994±29 d
Semi-major axis (a)26.6±3.4 mas
Eccentricity (e)0.243±0.026
Inclination (i)31.9±3.6°
Longitude of the node (Ω)12.6±7.7°
Periastron epoch (T)2444276.5±52 JD
Argument of periastron (ω)
(secondary)		35±7°
Semi-amplitude (K1)
(primary)		4.65±0.13 km/s
Details
HR 7135 A
Mass1.54[7] M☉
Radius10.69+0.17
−0.93[1] R☉
Luminosity52.8±0.9[1] L☉
Surface gravity (log g)2.7[8] cgs
Temperature4,666±51[7] K
Metallicity [Fe/H]–0.26[8] dex
Rotational velocity (v sin i)0.0[8] km/s
Age3.21[7] Gyr
Other designations
62 Ser, BD+06°3978, FK5 3509, HD 175515, HIP 92872, HR 7135, SAO 124050[9]
Database references
SIMBADdata

HR 7135 is a binary star system. Despite its Flamsteed designation of 62 Serpentis, the star can be found in the equatorial constellation of Aquila,[10] in front of a dark rift in the Milky Way near the constellation border.[5] It is visible to the naked eye as a dim, yellow-hued point of light with an apparent visual magnitude of 5.57.[2] The system is located 283 light years distant from the Sun, based on parallax,[1] and is drifting further away with a radial velocity of 23 km/s.[5]

Discovery of the binary nature of this system is credited to Canadian astronomer H. H. Plaskett in 1922. It is a single-lined spectroscopic binary with an orbital period of 8.2 years and an eccentricity of 0.24.[5][6] The visible component is an aging giant star with a stellar classification of G9 III,[3] having exhausted the supply of hydrogen at its core and expanded to 10.7[1] times the Sun's radius. It is a red clump giant, indicating it is on the horizontal branch and is generating energy via core helium fusion.[11] The star is 3.2[7] billion years old with 1.54[7] times the mass of the Sun. It is radiating 53[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,666 K.[7] The star has a very low rate of spin, with the projected rotational velocity being too small to measure.[8]

  1. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference McWilliam1990 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Griffin1981 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Jancart2005 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference kaler was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).