Theta Sagittae information

θ Sagittae
	Location of θ Sagittae (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Sagitta
	A
Right ascension	20h 09m 56.6470s
Declination	+20° 54′ 54.094″
Apparent magnitude (V)	+6.516
	B
Right ascension	20h 09m 56.2405s
Declination	+20° 55′ 04.228″
Apparent magnitude (V)	+8.769
Characteristics
A
Spectral type	F3V
U−B color index	−0.04
B−V color index	+0.38
B
Spectral type	G5V
B−V color index	+0.732
Astrometry
A
Radial velocity (Rv)	−40.92 km/s
Proper motion (μ)	RA: +58.387 mas/yr ; Dec.: +98.274 mas/yr
Parallax (π)	22.3262 ± 0.0326 mas
Distance	146.1 ± 0.2 ly ; (44.79 ± 0.07 pc)
Absolute magnitude (MV)	+3.24
B
Radial velocity (Rv)	−43.0 km/s
Proper motion (μ)	RA: +64.726 mas/yr ; Dec.: +101.800 mas/yr
Parallax (π)	22.3841 ± 0.0305 mas
Distance	145.7 ± 0.2 ly ; (44.67 ± 0.06 pc)
Absolute magnitude (MV)	+5.58
Details
A
Mass	1.52 M☉
Radius	1.45 R☉
Luminosity	4.0 L☉
Surface gravity (log g)	4.32 cgs
Temperature	6,750±229 K
Metallicity [Fe/H]	−0.17 dex
Rotational velocity (v sin i)	33.6 km/s
Age	2.089 Gyr
B
Mass	0.95 M☉
Radius	0.82 R☉
Luminosity	0.516 L☉
Surface gravity (log g)	4.526 cgs
Temperature	5,394 K
Other designations
	θ Sge, 17 Sge, BD+20°4453, HD 191570, WDS J20099+2055
	A: HIP 99352, HR 7705, SAO 88276
	B: HIP 99351, SAO 88275
Database references
SIMBAD	A
	B

Theta Sagittae (θ Sagittae) is a double star in the northern constellation of Sagitta.^[14] With a combined apparent visual magnitude of +6, it is near the limit of stars that can be seen with the naked eye. According to the Bortle scale the star is visible in dark suburban/rural skies. Based upon an annual parallax shift of 22.15 mas as seen from Earth,^[15] it is located roughly 147 light years from the Sun.

The binary pair consists of two stars separated by 502 AU.^[16] The primary, component A,^[17] is an F-type main sequence star with a stellar classification of F3V.^[4] This star is about two billion years old^[9] with 52% more mass than the Sun.^[9] It forms a double star with a magnitude 8.85 companion,^[17] which is located at an angular separation of 11.58 arc seconds along a position angle of 331.1°, as of 2011.^[14] The star is sometimes described as a triple star, with a 7th magnitude companion 91″ away.^[17] This is an unrelated giant star much further away than the close pair.^[18] A fainter star separated by nearly 3′ was also listed as a companion by Struve,^[17] again just an accidental optical association.^[19]

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^ ^a ^b ^c Cite error: The named reference tycho2 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference dr2b was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference abt1985 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference hr was invoked but never defined (see the help page).
^ Cite error: The named reference adams1935 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference David2015 was invoked but never defined (see the help page).
^ Cite error: The named reference doNascimento2003 was invoked but never defined (see the help page).
^ Cite error: The named reference ap1999 was invoked but never defined (see the help page).
^ Cite error: The named reference mcdonald2017 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Mason2012 was invoked but never defined (see the help page).
^ Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ Cite error: The named reference halbwachs2012 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
^ Cite error: The named reference dr2c was invoked but never defined (see the help page).
^ Cite error: The named reference dr2d was invoked but never defined (see the help page).

[Gaia-DR2-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference Gaia-DR2 was invoked but never defined (see the help page).

[tycho2-2] Cite error: The named reference tycho2 was invoked but never defined (see the help page).

[dr2b-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference dr2b was invoked but never defined (see the help page).

[abt1985-4] Cite error: The named reference abt1985 was invoked but never defined (see the help page).

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

[adams1935-6] Cite error: The named reference adams1935 was invoked but never defined (see the help page).

[Anderson2012-7] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[Casagrande2011-8] Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).

[David2015-9] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference David2015 was invoked but never defined (see the help page).

[doNascimento2003-10] Cite error: The named reference doNascimento2003 was invoked but never defined (see the help page).

[ap1999-11] Cite error: The named reference ap1999 was invoked but never defined (see the help page).

[mcdonald2017-12] Cite error: The named reference mcdonald2017 was invoked but never defined (see the help page).

[SIMBAD-13] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Mason2012-14] Cite error: The named reference Mason2012 was invoked but never defined (see the help page).

[vanLeeuwen2007-15] Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[halbwachs2012-16] Cite error: The named reference halbwachs2012 was invoked but never defined (see the help page).

[WDSC2014-17] Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).

[dr2c-18] Cite error: The named reference dr2c was invoked but never defined (see the help page).

[dr2d-19] Cite error: The named reference dr2d was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of θ Sagittae (circled)
Constellation	Sagitta
A
Right ascension	20^h 09^m 56.6470^s^[1]
Declination	+20° 54′ 54.094″^[1]
Apparent magnitude (V)	+6.516^[2]
B
Right ascension	20^h 09^m 56.2405^s^[3]
Declination	+20° 55′ 04.228″^[3]
Apparent magnitude (V)	+8.769^[2]
Characteristics
A
Spectral type	F3V^[4]
U−B color index	−0.04^[5]
B−V color index	+0.38^[5]
B
Spectral type	G5V^[6]
B−V color index	+0.732^[2]
Astrometry
A
Radial velocity (R_v)	−40.92^[1] km/s
Proper motion (μ)	RA: +58.387^[1] mas/yr Dec.: +98.274^[1] mas/yr
Parallax (π)	22.3262 ± 0.0326 mas^[1]
Distance	146.1 ± 0.2 ly (44.79 ± 0.07 pc)
Absolute magnitude (M_V)	+3.24^[7]
B
Radial velocity (R_v)	−43.0^[8] km/s
Proper motion (μ)	RA: +64.726^[3] mas/yr Dec.: +101.800^[3] mas/yr
Parallax (π)	22.3841 ± 0.0305 mas^[3]
Distance	145.7 ± 0.2 ly (44.67 ± 0.06 pc)
Absolute magnitude (M_V)	+5.58^[7]
Details
A
Mass	1.52^[9] `M`_☉
Radius	1.45^[1] `R`_☉
Luminosity	4.0^[1] `L`_☉
Surface gravity (log g)	4.32^[9] cgs
Temperature	6,750±229^[9] K
Metallicity [Fe/H]	−0.17^[8] dex
Rotational velocity (v sin i)	33.6^[10] km/s
Age	2.089^[9] Gyr
B
Mass	0.95^[11] `M`_☉
Radius	0.82^[3] `R`_☉
Luminosity	0.516^[3] `L`_☉
Surface gravity (log g)	4.526^[12] cgs
Temperature	5,394^[3] K
Other designations
θ Sge, 17 Sge, BD+20°4453, HD 191570, WDS J20099+2055^[13]
A: HIP 99352, HR 7705, SAO 88276
B: HIP 99351, SAO 88275
Database references
SIMBAD	A
	B

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