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== Properties == |
== Properties == |
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This is an ordinary [[G-type main-sequence star]] with a [[stellar classification]] of G0V.<ref name=Earle2017/> The Sun somewhat dwarfs HD 81040 in terms of physical characteristics: it has 87% of the [[Sun's mass]] and 91% of the [[radius of the Sun]]. It is spinning with a [[projected rotational velocity]] of 5.3 km/s,<ref name=Earle2017/> and has near solar [[metallicity]].<ref name=Anderson2012/> The age of the star is not precisely known; the [[ELODIE spectrograph]] suggested 0.8 Gyr and found it to have a young [[debris disk|dust disk]].<ref name="Sozzetti2006"/> Later measurements by modelling [[chromosphere|chromosperic]] activity suggested an age of 4.18 Gyr.{{cn|date=July 2020}} |
This is an ordinary [[G-type main-sequence star]] with a [[stellar classification]] of G0V.<ref name=Earle2017/> The Sun somewhat dwarfs HD 81040 in terms of physical characteristics: it has 87% of the [[Sun's mass]] and 91% of the [[radius of the Sun]]. It is spinning with a [[projected rotational velocity]] of 5.3 km/s,<ref name=Earle2017/> and has near solar [[metallicity]].<ref name=Anderson2012/> The age of the star is not precisely known; the [[ELODIE spectrograph]] suggested 0.8 Gyr and found it to have a young [[debris disk|dust disk]].<ref name="Sozzetti2006"/> Later measurements by modelling [[chromosphere|chromosperic]] activity suggested an age of 4.18 Gyr.{{cn|date=July 2020}} |
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On November 24, 2005, a [[superjovian]] [[planet]] was announced by Sozzetti et al.<ref name="Sozzetti2006"/> It was discovered using the radial velocity method. The inclination of its orbit is either 73 or 107 degrees, so its true mass is higher than that predicted from its [[m sin i]].<ref name=Li2021>{{cite journal|doi=10.3847/1538-3881/ac27ab}}</ref> |
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On November 24, 2005, a [[superjovian]] [[planet]] was announced by Sozzetti. |
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{{OrbitboxPlanet begin |
{{OrbitboxPlanet begin |
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| table_ref = <ref name=" |
| table_ref = <ref name="Li2021"/> |
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}} |
}} |
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{{OrbitboxPlanet |
{{OrbitboxPlanet |
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| exoplanet = [[HD 81040 b|b]] |
| exoplanet = [[HD 81040 b|b]] |
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| mass = {{Val| |
| mass = {{Val|7.24|1.0|0.37}} |
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| period = {{Val|1001. |
| period = {{Val|1001.998|4.0|3.39|fmt=commas}} |
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| semimajor = 1. |
| semimajor = {{Val|1.946|0.014}} |
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| eccentricity = {{Val|0. |
| eccentricity = {{Val|0.525|0.024|0.026}} |
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}} |
}} |
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{{Orbitbox end}} |
{{Orbitbox end}} |
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{{Stars of Leo}} |
{{Stars of Leo}} |
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{{Sky|10|38|45.1|-|59|10|59|1000000000}} |
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{{DEFAULTSORT:HD 81040}} |
{{DEFAULTSORT:HD 81040}} |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Leo |
Right ascension | 09h23m 47.08736s[1] |
Declination | +20° 21′ 52.0282″[1] |
Apparent magnitude (V) | +7.73[2] |
Characteristics | |
Spectral type | G0V[2] |
B−V color index | 0.680±0.012 |
Astrometry | |
Radial velocity (Rv) | +49.270±0.0017[3] km/s |
Proper motion (μ) | RA: −151.258±0.093[1] mas/yr Dec.: +36.125±0.065[1] mas/yr |
Parallax (π) | 29.0122 ± 0.0649 mas[1] |
Distance | 112.4 ± 0.3 ly (34.47 ± 0.08 pc) |
Absolute magnitude (MV) | 5.12[4] |
Details[2] | |
Mass | 0.87 M☉ |
Radius | 0.91+0.01 −0.03[1] R☉ |
Luminosity | 0.76 L☉ |
Surface gravity (log g) | 4.48 cgs |
Temperature | 5,753 K |
Metallicity [Fe/H] | −0.06±0.03[4] dex |
Rotational velocity (v sin i) | 5.3 km/s |
Age | 8.68 Gyr |
Other designations | |
BD+20°2374, FK5 4836, GC 12951, HD 81040, HIP 46076, SAO 80800, PPM 99541[5] | |
Database references | |
SIMBAD | data |
HD 81040 is a star in the equatorial constellationofLeo. With an apparent visual magnitude of +7.73[2] it is too dim to be visible to the naked eye but can be viewed with a small telescope. The star is located at a distance of 112 light years from the Sun based on parallax. It is drifting further away with a radial velocity of +49 km/s,[3] having come to within 48 light-years some 527,000 years ago.
This is an ordinary G-type main-sequence star with a stellar classification of G0V.[2] The Sun somewhat dwarfs HD 81040 in terms of physical characteristics: it has 87% of the Sun's mass and 91% of the radius of the Sun. It is spinning with a projected rotational velocity of 5.3 km/s,[2] and has near solar metallicity.[4] The age of the star is not precisely known; the ELODIE spectrograph suggested 0.8 Gyr and found it to have a young dust disk.[6] Later measurements by modelling chromosperic activity suggested an age of 4.18 Gyr.[citation needed]
On November 24, 2005, a superjovian planet was announced by Sozzetti et al.[6] It was discovered using the radial velocity method. The inclination of its orbit is either 73 or 107 degrees, so its true mass is higher than that predicted from its m sin i.[7]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 7.24+1.0 −0.37 MJ |
1.946±0.014 | 1,001.998+4.0 −3.39 |
0.525+0.024 −0.026 |
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