Coordinates: Sky map 20h 11m 11.93827s, −36° 06′ 04.3610″

HR 7703

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HR 7703
HR 7703 is located in the constellation Sagittarius
HR 7703 is located in the constellation Sagittarius
HR 7703
Location of HR 7703 in the constellation Sagittarius

Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
A
Right ascension 20h 11m 11.93877s[1]
Declination −36° 06′ 04.3517″[1]
Apparent magnitude (V) 5.31[2]
B
Right ascension 20h 11m 12.80289s[3]
Declination −36° 06′ 32.1661″[3]
Apparent magnitude (V) 11.50[4]
Characteristics
Spectral type K2.5 V[5] + M4 V[6]
U−B color index +0.43[2]
B−V color index +0.85[2]
Astrometry
A
Radial velocity (Rv)−129.27±0.12[1] km/s
Proper motion (μ) RA: +456.99[1] mas/yr
Dec.: −1574.64[1] mas/yr
Parallax (π)166.3272±0.1065 mas[1]
Distance19.61 ± 0.01 ly
(6.012 ± 0.004 pc)
Absolute magnitude (MV)+6.53[7]
B
Absolute magnitude (MV)+12.7[8]
Details
HR 7703 A
Mass0.65[9] M☉
Radius0.66[9] R☉
Luminosity0.26[9] L☉
Surface gravity (log g)4.48±0.17[9] cgs
Temperature5,075±43[9] K
Metallicity [Fe/H]−0.56±0.04[9] dex
Rotation45 days[10]
Rotational velocity (v sin i)1.8±0.2[7] km/s
Age7.7[11] Gyr
HR 7703 B
Mass0.24[12] M☉
Radius0.28[4] R☉
Luminosity0.0009[13] L☉
Other designations
279 G. Sagittarii, Gliese 783, CD−36°13940, GCTP 4782.00, HD 191408, HIP 99461, SAO 211885.[14]
HR 7703 A: LHS 486, LFT 1529, LTT 7988
HR 7703 B: LHS 487, LFT 1530, LTT 7989
Database references
SIMBADThe system
A
B

HR 7703 (Gliese 783, 279 G. Sagittarii) is a binary star system in the constellation of Sagittarius. The brighter component has an apparent visual magnitude of 5.31,[2] which means it is visible from suburban skies at night. The two stars are separated by an angle of 7.10″, which corresponds to an estimated semimajor axis of 56.30 AU for their orbit.[12]

Based upon an annual parallax shift of 0.16625 arc seconds as measured by the Hipparcos satellite, this system is 19.62 light-years (6.015 parsecs) from Earth. It is approaching the Solar System at a velocity of approximately 129 kilometers per second.[15] At this rate, it will make its closest approach in 41,100 years when it comes to within 6.7 light-years (2.05 parsecs) of the Sun.[16]

This star system has been examined for an excess of radiation in the infrared. The presence of an infrared excess can be taken as an indication of a debris disk orbiting the star. However, no such excess was discovered around HR 7703.[17] Radial velocity data collected over a period of 12 years was examined for signs of periodicity caused by a planet orbiting at a distance of 3–6 AU, but none was detected.[18] A slight linear trend in the radial velocities of the primary is probably due to the companion star.[19]

See also

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References

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  1. ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  3. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  4. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  11. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  12. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  15. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  16. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  17. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  18. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  19. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
[edit | edit source]
  • Indus and Pavo
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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