62 Sagittarii information

62 Sagittarii
	; The four stars of the Terebellum
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Sagittarius
Right ascension	20h 02m 39.48097s
Declination	−27° 42′ 35.4443″
Apparent magnitude (V)	4.45 to 4.64
Characteristics
Spectral type	M4.5III
U−B color index	+1.80
B−V color index	+1.65
R−I color index	+1.56
Variable type	LB
Astrometry
Radial velocity (Rv)	+9.9±0.8 km/s
Proper motion (μ)	RA: +32.97 mas/yr ; Dec.: +14.00 mas/yr
Parallax (π)	7.27 ± 0.18 mas
Distance	450 ± 10 ly ; (138 ± 3 pc)
Absolute magnitude (MV)	−1.26
Details
Radius	72+16; −6 R☉
Luminosity	1,107±74 L☉
Temperature	3,915+168; −380 K
Rotational velocity (v sin i)	1.5±1.5 km/s
Other designations
	c Sgr, 62 Sgr, V3872 Sagittarii, CD−28°16355, CPD−28°7105, FK5 753, GC 27763, HD 189763, HIP 98688, HR 7650, SAO 188844, PPM 270603
Database references
SIMBAD	data

62 Sagittarii is a single,^[10] variable star in the constellation of Sagittarius. It has the Bayer designation c Sagittarii and the variable star designation V3872 Sagittarii, while 62 Sagittarii is its Flamsteed designation. This object forms the southwest corner of the asterism called the Terebellum. It is visible to the naked eye with an apparent visual magnitude that varies between 4.45 and 4.64,^[2] and, at its peak, it is the brightest of the four stars in the Terebellum. 62 Sagittarii is the star in the Terebellum which is most distant from its centre; it is 1.72° from its northwest corner, 60 Sagittarii, and 1.37° from its southeast corner, 59 Sagittarii. This star is located approximately 450 light-years from the Sun based on parallax,^[1] and is drifting further away with a radial velocity of +10 km/s.^[5]

A visual band light curve for V3872 Sagittarii, adapted from data published by Tabur *et al.* (2009)^[11]

This is an aging red giant with a stellar classification of M4.5III,^[3] a star that has exhausted the supply of hydrogen at its core and expanded to around 72^[7] times the Sun's radius. It is a slow irregular variable with multiple pulsation periods.^[11] The star is radiating about 1,100^[7] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,915 K.^[7]

Pulsation periods of 62 Sagittarii^[11]
Period (days)	24.0	30.4	31.3	42.8	50.5	234.7
Amplitude (mag.)	0.027	0.019	0.043	0.042	0.022	0.018

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[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[gcvs1-2] Cite error: The named reference gcvs1 was invoked but never defined (see the help page).

[perkins1989-3] Cite error: The named reference perkins1989 was invoked but never defined (see the help page).

[bsc2-4] Cite error: The named reference bsc2 was invoked but never defined (see the help page).

[Gontcharov2006-5] Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).

[Anderson2012-6] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[GaiaDR2-7] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).

[Zamanov2008-8] Cite error: The named reference Zamanov2008 was invoked but never defined (see the help page).

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[Eggleton2008-10] Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

[Tabur2009-11] Cite error: The named reference Tabur2009 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
The four stars of the Terebellum
Constellation	Sagittarius
Right ascension	20^h 02^m 39.48097^s^[1]
Declination	−27° 42′ 35.4443″^[1]
Apparent magnitude (V)	4.45 to 4.64^[2]
Characteristics
Spectral type	M4.5III^[3]
U−B color index	+1.80^[4]
B−V color index	+1.65^[4]
R−I color index	+1.56^[4]
Variable type	LB^[2]
Astrometry

Radial velocity (R_v)	+9.9±0.8^[5] km/s
Proper motion (μ)	RA: +32.97^[1] mas/yr Dec.: +14.00^[1] mas/yr
Parallax (π)	7.27 ± 0.18 mas^[1]
Distance	450 ± 10 ly (138 ± 3 pc)
Absolute magnitude (M_V)	−1.26^[6]

Details

Radius	72+16 −6^[7] `R`_☉
Luminosity	1,107±74^[7] `L`_☉
Temperature	3,915+168 −380^[7] K
Rotational velocity (v sin i)	1.5±1.5^[8] km/s

Other designations
c Sgr, 62 Sgr, V3872 Sagittarii, CD−28°16355, CPD−28°7105, FK5 753, GC 27763, HD 189763, HIP 98688, HR 7650, SAO 188844, PPM 270603^[9]
Database references
SIMBAD	data

62 Sagittarii information

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