4 Sagittarii

4 Sagittarii
Location of 4 Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 17h 59m 47.55132s
Declination −23° 48′ 58.0269″
Apparent magnitude (V) 4.74
Characteristics
Spectral type B9V
U−B color index −0.03
B−V color index -0.05
Astrometry
Radial velocity (Rv)−18.00 km/s
Proper motion (μ) RA: +3.673 mas/yr
Dec.: −50.327 mas/yr
Parallax (π)8.3677 ± 0.4521 mas
Distance390 ± 20 ly
(120 ± 6 pc)
Absolute magnitude (MV)−0.77
Details
Mass3.23 M
Luminosity240 L
Temperature9,661 K
Rotational velocity (v sin i)149 km/s
Other designations
4 Sgr, CD−23°13731, FK5 3430, GC 24483, HD 163955, HIP 88116, HR 6700, SAO 186061, GSC 06841-01403
Database references
SIMBADdata

4 Sagittarii is a suspected astrometric binary star system in the zodiac constellation of Sagittarius, located approximately 390 light years away based on parallax. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.74, The system is moving closer to the Earth with a heliocentric radial velocity of −18 km/s.

The visible component is a B-type main-sequence star with a stellar classification of B9 V. It has a high rate of spin, displaying a projected rotational velocity of 149 km/s. This is giving it an oblate shape with an equatorial bulge that is an estimated 14% larger than the polar radius. 4 Sagittarii has 3.23 times the mass of the Sun and is radiating 240 times the Sun's luminosity from its photosphere at an effective temperature of 9,661 K.


This page was last updated at 2024-03-17 02:55 UTC. Update now. View original page.

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