13 Delphini

13 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
A
Right ascension 20h 47m 48.3330s[1]
Declination +06° 00′ 29.551″[1]
Apparent magnitude (V) 5.66[2]
B
Right ascension 20h 47m 48.3012s[1]
Declination +06° 00′ 28.127″[1]
Apparent magnitude (V) 8.51[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A0 V[4]
U−B color index −0.09[5]
B−V color index −0.01[5]
Astrometry
Radial velocity (Rv)−7±4.3[6] km/s
Absolute magnitude (MV)−0.01[7]
A
Proper motion (μ) RA: +8.255 mas/yr[1]
Dec.: −13.162 mas/yr[1]
Parallax (π)6.9265 ± 0.0489 mas[1]
Distance471 ± 3 ly
(144 ± 1 pc)
B
Proper motion (μ) RA: +5.663 mas/yr[8]
Dec.: −12.280 mas/yr[8]
Parallax (π)6.6697 ± 0.0989 mas[8]
Distance489 ± 7 ly
(150 ± 2 pc)
Details
Mass2.51+0.31
−0.36[9] M☉
Radius3.7±0.4[9] R☉
Luminosity119+20
−17[3] L☉
Surface gravity (log g)3.69+0.61
−0.69[9] cgs
Temperature9,840+91
−90[3] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)170[11] km/s
Age307[10] Myr
Other designations
13 Del, 18 G. Delphini, AG+05°3035, BD+05°4613, GC 28986, HD 198069, HIP 102633, HR 7953, SAO 126222, WDS J20478+0600A
Database references
SIMBADdata

13 Delphini is a binary star[2] in the equatorial constellation Delphinus, with a combined apparent magnitude of 5.64.[12] The system is located at a distance of 471 light years but is approaching the Solar System with a heliocentric radial velocity of about −7 km/s.[6]

13 Delphini A has an apparent magnitude of 5.66, while its companion has an apparent magnitude of 8.51.[2] As of 2016, the pair have a separation of 1.5″ located at a position angle of 200°.[13]

13 Delphini has a blended stellar classification of A0 V,[4] indicating that it is an ordinary A-type main-sequence star. However, when the components are analysed individually, the primary star is given a class of B9V.[14] It has 2.51 times the mass of the Sun[9] and has an effective temperature of 9,840 K.[3] However, the star is large for its class, having a radius almost 4 times that of the Sun[9] and a luminosity 119 times greater.[3] This is due to 13 Delphini having completed 86.1% of its main sequence lifetime[3] and has led one source to classify it as a subgiant instead.[15] It spins rapidly with a projected rotational velocity of 170 km/s[11] and has an age of 307 million years.[10]

  1. ^ a b c d e f Cite error: The named reference EDR3a was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Eggelton2008 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Paunzen2001 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Cousins1971 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference EDR3b was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Royer2006 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference tycho was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Palmer1968 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Abt1995 was invoked but never defined (see the help page).