HR 7703
{{Short description|Binary star system in the constellation of Sagittarius}}
{{Sky|20|11|11.93827|-|36|06|04.3610|19.61}}
{{Starbox begin
| name = HR 7703
}}
{{Starbox observe
| epoch = J2000
| constell = Sagittarius
| dec = {{DEC|–36|06|04.3610}}
| appmag_v = 5.31/11.50
}}
{{Starbox character
| class = K2.5 V + M4 V
| variable =
}}
{{Starbox astrometry
| parallax = 166.3272
| p_error = 0.1065
| parallax_footnote = {{Cite Gaia EDR3|6697578465310949376}}
}}
{{Starbox detail
| component1 = HR 7703 A
| metal_fe = {{nowrap|–0.56 ± 0.04}}
| gravity = {{nowrap|4.48 ± 0.17}}
| rotational_velocity = {{nowrap|1.8 ± 0.2}}
| temperature = {{nowrap|5,075 ± 43}}
| component2 = HR 7703 B
}}
{{Starbox catalog
| names=279 G. Sagittarii, Gliese 783, CD –36°13940, GCTP 4782.00, HD 191408, HIP 99461, SAO 211885.
| component1 = HR 7703 A
| names1 = LHS 486, LFT 1529, LTT 7988
| component2 = HR 7703 B
| names2 = LHS 487, LFT 1530, LTT 7989
}}
{{Starbox reference
| Simbad = CCDM+J20112-3605AB|sn=The system
| Simbad2 = TYC+7453-1391-1|sn2=A
| Simbad3 = LHS+487|sn3=B
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Celestial_map_Sgr.svg
|alt=HR 7703 is located in the constellation Sagittarius
|caption=Location of HR 7703 in the constellation Sagittarius|border=infobox|mark=Red_circle.svg|width=280
|label=HR 7703
|lat=29.4
|long=15.6
|float=center
}}|caption=
}}
{{Starbox end}}
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, 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.
Based upon an annual parallax shift of 0.16625 arc seconds as measured by the Hipparcos satellite, this system is {{Convert|6.015|pc|ly|abbr=off|lk=on|disp=flip}} from Earth. It is approaching the Solar System at a velocity of approximately 129 kilometers per second. At this rate, it will make its closest approach in 41,100 years when it comes to within {{Convert|2.05|pc|ly|abbr=off|disp=flip}} of the Sun.
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. 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. A slight linear trend in the radial velocities of the primary is probably due to the companion star.
References
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| title=HD 191408
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}}
}}
External links
- [https://web.archive.org/web/20050311085433/http://www.astronexus.com/3duniv/anim-pages/pm-pavo.php Indus and Pavo]
- {{citation | title=J. Herschel 5173 AB | work=SolStation | url=http://www.solstation.com/stars/hj5173ab.htm | access-date=November 6, 2005 }}
{{Nearest systems|4}}
{{Stars of Sagittarius}}
{{DEFAULTSORT:HR 7703}}
Category:Sagittarius (constellation)
Category:K-type main-sequence stars
Category:M-type main-sequence stars