HD 130458

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Template:Short description

HD 130458
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.77±0.01[2]
B
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 7.54±0.01[2]
Characteristics
A
Evolutionary stage Horizontal branch[4]
Spectral type G7 IIIa[5] (G8 IIb)[4]
U−B Template:Engvar +0.42[6]
B−V Template:Engvar +0.82[6]
B
Spectral type F9 IV[5]
Astrometry
Radial velocity (Rv)+31.4 ± 2.5[7] km/s
Absolute magnitude (MV)+0.58[8]
A
Proper motion (μ) RA: +15.901[1] mas/yr
Dec.: +28.871[1] mas/yr
Parallax (π)10.5077±0.3522 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
B
Proper motion (μ) RA: +20.669[3] mas/yr
Dec.: +19.875[3] mas/yr
Parallax (π)10.0654±0.0476 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
A
Mass1.5[9] Template:Solar mass
Radius8.87[10] Template:Solar radius
Luminosity54.7[11] Template:Solar luminosity
Surface gravity (log g)2.65[9] cgs
Temperature5194±124[10] K
Metallicity [Fe/H]−0.17[9] dex
Rotational velocity (v sin i)3.6±1[12] km/s
B
Mass1.41[9] Template:Solar mass
Radius2.8[13] Template:Solar radius
Luminosity7.5[14] Template:Solar luminosity
Surface gravity (log g)3.96[9] cgs
Temperature6,601[9] K
Metallicity [Fe/H]−0.18[9] dex
Other designations
Template:Odlist[15]
Database references
SIMBADdata

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HD 130458 (HR 5520) is a double star[16] in the southern circumpolar constellation of Apus. The pair has a combined apparent magnitude of 5.8,[6] making it faintly visible to the naked eye under ideal conditions. Parallax measurements place the system 310-24 light years away[1] and it is receding with a heliocentric radial velocity of Script error: No such module "val"..[7]

The primary is a red giant with a stellar classification of G7 IIIa. It was earlier classified as G8 IIb, indicating a bright giant.The dimmer component has a stellar classification of F9 IV, indicating that it is an F-type subgiant evolving onto the red giant branch. As of 2008, the pair has an angular separation of 2.167″.[16]

At present the primary has 1.5 times the mass of the Sun[9] but has expanded to 8.9[10] times its girth. It radiates at 55[11] times the luminosity of the Sun from its enlarged photosphere at an effective temperature 5,194 K,[10] which gives it a yellow glow. Currently it spins leisurely with a projected rotational velocity of Script error: No such module "val".,[12] common for giants. HD 130458A is believed to be on the horizontal branch.[4]

As for the secondary component, it has 1.4 times the mass of the Sun and an effective temperature of Script error: No such module "val"., giving a yellowish white hue.[9]

References

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  1. ↑ a b c d e f Template:Cite Gaia EDR3
  2. ↑ a b Script error: No such module "Citation/CS1".
  3. ↑ a b c d e Template:Cite Gaia EDR3
  4. ↑ a b c Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b c Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
  10. ↑ a b c d Script error: No such module "Citation/CS1".
  11. ↑ a b Script error: No such module "Citation/CS1".
  12. ↑ a b Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Template:Cite Gaia DR2
  15. ↑ Template:Cite simbad
  16. ↑ a b Script error: No such module "Citation/CS1".
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External links

Template:Stars of Apus

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