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Sigma Draconis information


Sigma Draconis

Photograph of Sigma Draconis (center)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 19h 32m 21.59021s[1]
Declination +69° 39′ 40.2358″[1]
Apparent magnitude (V) 4.674[2]
Characteristics
Evolutionary stage Main sequence
Spectral type K0 V[3]
U−B color index +0.386[2]
B−V color index +0.791[2]
Variable type None[4]
Astrometry
Radial velocity (Rv)26.55±0.13[1] km/s
Proper motion (μ) RA: 597.384 mas/yr[1]
Dec.: −1738.286 mas/yr[1]
Parallax (π)173.4939 ± 0.0748 mas[1]
Distance18.799 ± 0.008 ly
(5.764 ± 0.002 pc)
Absolute magnitude (MV)5.89[5]
Details
Mass0.85+0.01
−0.03
[6] M
Radius0.776±0.008[7] R
Luminosity0.410±0.006[7] L
Surface gravity (log g)4.59±0.02[6] cgs
Temperature5,255±31[7] K
Metallicity [Fe/H]−0.20±0.04[6] dex
Rotational velocity (v sin i)1.4[8] km/s
Age3.00±0.60[6] Gyr
Other designations
Alsafi, σ Draconis, Sig Dra, σ Dra, 61 Draconis, BD+69°1053, GJ 764, HD 185144, HIP 96100, HR 7462, LHS 477[9]
Database references
SIMBADdata
ARICNSdata
Sigma Draconis is located in the constellation Draco
Sigma Draconis is located in the constellation Draco
σ
Location of Sigma Draconis (in red circle).

Sigma Draconis is a single star in the northern constellation of Draco. It has the proper name Alsafi /ælˈsfi/,[10] while Sigma Draconis, which is latinised from σ Draconis and abbreviated Sig Dra or σ Dra, is the Bayer designation. It has an apparent visual magnitude of 4.7,[2] which is bright enough to be faintly visible to the naked eye. Based on parallax measurements, this star is located at a distance of 18.8 light years from the Sun. It is receding from the Sun with a radial velocity of 26.6 km/s.[11]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aaass65_2_405 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Keenan89 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Radick1998 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Kim2016 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Ramirez2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference apj746_1_101 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa555_A104 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. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
  11. ^ Cite error: The named reference Bailer_et_al_2018 was invoked but never defined (see the help page).

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A-type Altair (Alpha Aquilae) (16.730±0.049 ly) G-type Alsafi (Sigma Draconis) (18.7993±0.0081 ly) Achird (Eta Cassiopeiae) (19.3314±0.0025 ly) K-type...

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Stellar classification

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compared to those with the broadest such zones. Spectral standards: K0V – Sigma Draconis K0III – Pollux K0III – Epsilon Cygni K2V – Epsilon Eridani K2III – Kappa...

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GJ 1061

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