HD 183143

HD 183143

A visual band light curve for HT Sagittae, plotted from ASAS-SN data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagitta
Right ascension 19h 27m 26.5636s[2]
Declination +18° 17′ 45.193″[2]
Apparent magnitude (V) 6.71 - 6.95[3]
Characteristics
Spectral type B6-8 Ia-0[4]
Apparent magnitude (B) 8.08
Apparent magnitude (J) 4.13
Apparent magnitude (K) 3.46
U−B color index +0.2[5]
B−V color index +1.2[5]
Variable type α Cyg?[3]
Astrometry
Proper motion (μ) RA: −1.004[2] mas/yr
Dec.: −5.703[2] mas/yr
Parallax (π)0.4296 ± 0.0243 mas[2]
Distance7,600 ± 400 ly
(2,300 ± 100 pc)
Absolute magnitude (MV)−8.7[4]
Details
Mass24.2[5] M☉
Radius109[5] R☉
Luminosity288,000[5] L☉
Surface gravity (log g)1.40[6] cgs
Temperature11,500[6] K
Rotational velocity (v sin i)37[6] km/s
Age7.6[5] Myr
Other designations
HT Sge, BD+18°4085, HD 183143, HIP 95657, SAO 104860
Database references
SIMBADdata

HD 183143 (HT Sagittae) is a blue hypergiant star located in the constellation of Sagitta.

This star has an apparent magnitude of 6.9, meaning that can be seen with the naked eye under very dark skies and that is an easy target for binoculars or a small telescope.

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  3. ^ a b Cite error: The named reference vsx was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference chentsov was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference webmayer2022 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference galazutdinov was invoked but never defined (see the help page).