Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Sagitta |
A | |
Right ascension | 20h 09m 56.6470s [1] |
Declination | +20° 54′ 54.094″ [1] |
Apparent magnitude (V) | +6.516 [2] |
B | |
Right ascension | 20h 09m 56.2405s [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 (Rv) | −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 (MV) | +3.24 [7] |
B | |
Radial velocity (Rv) | −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 (MV) | +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 | |
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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cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Sagitta |
A | |
Right ascension | 20h 09m 56.6470s [1] |
Declination | +20° 54′ 54.094″ [1] |
Apparent magnitude (V) | +6.516 [2] |
B | |
Right ascension | 20h 09m 56.2405s [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 (Rv) | −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 (MV) | +3.24 [7] |
B | |
Radial velocity (Rv) | −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 (MV) | +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 | |
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]
{{
cite web}}
: CS1 maint: postscript (
link)