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Line 4: | Line 4: | ||
| epoch = J2000 |
| epoch = J2000 |
||
| constell = [[Leo (constellation)|Leo]] |
| constell = [[Leo (constellation)|Leo]] |
||
| ra = {{RA|09|23|47. |
| ra = {{RA|09|23|47.08737}}<ref name=GaiaDR3/> |
||
| dec = {{DEC|+20|21|52. |
| dec = {{DEC|+20|21|52.0349}}<ref name=GaiaDR3/> |
||
| appmag_v = +7.73<ref name=Earle2017/> |
| appmag_v = +7.73<ref name=Earle2017/> |
||
}} |
}} |
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Line 17: | Line 17: | ||
{{Starbox astrometry |
{{Starbox astrometry |
||
| radial_v = {{Val|+49.270|0.0017}}<ref name=Soubiran2018/> |
| radial_v = {{Val|+49.270|0.0017}}<ref name=Soubiran2018/> |
||
| prop_mo_ra = {{val|-151.265|0.045}} |
| prop_mo_ra = {{val|-151.265|0.045}} |
||
| prop_mo_dec = {{val|35.708|0.036}}<ref name=GaiaDR3/> |
| prop_mo_dec = {{val|35.708|0.036}} |
||
| pm_footnote = <ref name=GaiaDR3/> |
|||
| parallax = 29.0635 |
| parallax = 29.0635 |
||
| p_error = 0.0414 |
| p_error = 0.0414 |
||
| parallax_footnote = <ref name=GaiaDR3 |
| parallax_footnote = <ref name=GaiaDR3/> |
||
| absmag_v = 5.12<ref name=Anderson2012/> |
| absmag_v = 5.12<ref name=Anderson2012/> |
||
}} |
}} |
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{{Starbox detail |
{{Starbox detail |
||
| source = |
| source = |
||
| mass = 0. |
| mass = {{val|0.962|0.040}}<ref name="Winn2022"/> |
||
| radius = {{Val|0.91|0.01|0.03}}<ref name=GaiaDR2/> |
| radius = {{Val|0.91|0.01|0.03}}<ref name=GaiaDR2>{{Cite Gaia DR2|637329067477530368}}</ref> |
||
| luminosity = 0. |
| luminosity = {{val|0.838|0.018}}<ref name="Li2021"/> |
||
| gravity = 4.48 |
| gravity = 4.48<ref name=Earle2017/> |
||
| temperature = 5,753 |
| temperature = 5,753<ref name=Earle2017/> |
||
| metal_fe = {{Val|−0.06|0.03}}<ref name=Anderson2012/> |
| metal_fe = {{Val|−0.06|0.03}}<ref name=Anderson2012/> |
||
| rotation = {{val|15.98|ul=d}}<ref name="Li2021"/> |
|||
| rotational_velocity = 5.3 |
| rotational_velocity = 5.3<ref name=Earle2017/> |
||
| age_gyr = 8.68 |
|||
| age_gyr = {{val|1.79|0.30|0.26}}<ref name="Li2021"/> |
|||
}} |
}} |
||
{{Starbox catalog |
{{Starbox catalog |
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Line 49: | Line 51: | ||
__NOTOC__ |
__NOTOC__ |
||
== Planetary system == |
== Planetary system == |
||
On November 24, 2005, a [[superjovian]] [[planet]] was announced by Sozzetti et al.<ref name="Sozzetti2006"/> It was discovered using the radial velocity method. [[Astrometry|Astrometric]] measurements show that the inclination of its orbit is |
On November 24, 2005, a [[superjovian]] [[planet]] was announced by Sozzetti et al.<ref name="Sozzetti2006"/> It was discovered using the radial velocity method. [[Astrometry|Astrometric]] measurements using ''[[Gaia (spacecraft)|Gaia]]'', published in several papers, show that the inclination of its orbit is about 111 degrees, so its true mass is somewhat higher than that predicted from its [[minimum mass]].<ref name=Li2021/><ref>{{cite web |url=https://www.cosmos.esa.int/web/gaia/iow_20220131 |title=Image of the Week: Astrometric Orbit of the Exoplanet-Host Star HD81040 |date=31 January 2022 |website=cosmos.esa.int |publisher=[[ESA]]/Gaia/DPAC/CU4-CU3 |access-date=14 September 2022}}</ref><ref name="GaiaDR3Exoplanets"/><ref name="Feng2022"/><ref name="Winn2022"/> |
||
{{OrbitboxPlanet begin |
{{OrbitboxPlanet begin |
||
| table_ref = <ref name="Li2021"/> |
| table_ref = <ref name="Li2021"/><ref name="Winn2022"/> |
||
}} |
}} |
||
{{OrbitboxPlanet |
{{OrbitboxPlanet |
||
| exoplanet = [[HD 81040 b|b]] |
| exoplanet = [[HD 81040 b|b]] |
||
| mass = {{ |
| mass = {{val|7.53|0.032}} |
||
| period = {{ |
| period = {{val|1004.7|3.0|fmt=commas}} |
||
| semimajor = {{ |
| semimajor = {{val|1.946|0.014}} |
||
| eccentricity = {{ |
| eccentricity = {{val|0.525|0.024|0.026}} |
||
| inclination = {{val| |
| inclination = {{val|111.4|4.4|4.7}} |
||
}} |
}} |
||
{{Orbitbox end}} |
{{Orbitbox end}} |
||
Line 70: | Line 72: | ||
{{Reflist|refs= |
{{Reflist|refs= |
||
<ref name= |
<ref name=GaiaDR3>{{Cite Gaia DR3|637329067477530368}}</ref> |
||
<ref name=SIMBAD>{{cite simbad | title=HD 81040 | access-date=2018-07-13}}</ref> |
<ref name=SIMBAD>{{cite simbad | title=HD 81040 | access-date=2018-07-13}}</ref> |
||
Line 125: | Line 127: | ||
| doi=10.1051/0004-6361:20054303 | s2cid=7647622 |
| doi=10.1051/0004-6361:20054303 | s2cid=7647622 |
||
}}</ref> |
}}</ref> |
||
<ref name=Li2021>{{cite journal|doi=10.3847/1538-3881/ac27ab|title=Precise Masses and Orbits for Nine Radial-velocity Exoplanets|year=2021|last1=Li|first1=Yiting|last2=Brandt|first2=Timothy D.|last3=Brandt|first3=G. Mirek|last4=Dupuy|first4=Trent J.|last5=Michalik|first5=Daniel|last6=Jensen-Clem|first6=Rebecca|last7=Zeng|first7=Yunlin|last8=Faherty|first8=Jacqueline|last9=Mitra|first9=Elena L.|journal=The Astronomical Journal|volume=162|issue=6|page=266|arxiv=2109.10422|bibcode=2021AJ....162..266L|s2cid=237592581}}</ref> |
|||
<ref name="GaiaDR3Exoplanets">{{cite arXiv | eprint = 2206.05595| last1 = Gaia Collaboration| last2 = Arenou| first2 = F.| last3 = Babusiaux| first3 = C.| last4 = Barstow| first4 = M. A.| last5 = Faigler| first5 = S.| last6 = Jorissen| first6 = A.| last7 = Kervella| first7 = P.| last8 = Mazeh| first8 = T.| last9 = Mowlavi| first9 = N.| last10 = Panuzzo| first10 = P.| last11 = Sahlmann| first11 = J.| last12 = Shahaf| first12 = S.| last13 = Sozzetti| first13 = A.| last14 = Bauchet| first14 = N.| last15 = Damerdji| first15 = Y.| last16 = Gavras| first16 = P.| last17 = Giacobbe| first17 = P.| last18 = Gosset| first18 = E.| last19 = Halbwachs| first19 = J. -L.| last20 = Holl| first20 = B.| last21 = Lattanzi| first21 = M. G.| last22 = Leclerc| first22 = N.| last23 = Morel| first23 = T.| last24 = Pourbaix| first24 = D.| last25 = Re Fiorentin| first25 = P.| last26 = Sadowski| first26 = G.| last27 = Ségransan| first27 = D.| last28 = Siopis| first28 = C.| last29 = Teyssier| first29 = D.| last30 = Zwitter| first30 = T.| title = Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure| year = 2022| class = astro-ph.SR| display-authors = 1}}</ref> |
|||
<ref name="Feng2022">{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=[[The Astrophysical Journal Supplement Series]] |volume=262 |issue=21 |pages= |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F}}</ref> |
|||
<ref name="Winn2022">{{cite arXiv |last=Winn |first=Joshua N. |eprint=2209.05516 |title=Joint Constraints on Exoplanetary Orbits from Gaia DR3 and Doppler Data |class=astro-ph.EP |date=September 2022}}</ref> |
|||
}} |
}} |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Leo |
Right ascension | 09h23m 47.08737s[1] |
Declination | +20° 21′ 52.0349″[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: −151.265±0.045 mas/yr[1] Dec.: 35.708±0.036 mas/yr[1] |
Parallax (π) | 29.0635 ± 0.0414 mas[1] |
Distance | 112.2 ± 0.2 ly (34.41 ± 0.05 pc) |
Absolute magnitude (MV) | 5.12[4] |
Details | |
Mass | 0.962±0.040[5] M☉ |
Radius | 0.91+0.01 −0.03[6] R☉ |
Luminosity | 0.838±0.018[7] L☉ |
Surface gravity (log g) | 4.48[2] cgs |
Temperature | 5,753[2] K |
Metallicity [Fe/H] | −0.06±0.03[4] dex |
Rotation | 15.98 d[7] |
Rotational velocity (v sin i) | 5.3[2] km/s |
Age | 1.79+0.30 −0.26[7] Gyr |
Other designations | |
BD+20°2374, FK5 4836, GC 12951, HD 81040, HIP 46076, SAO 80800, PPM 99541[8] | |
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.[9] 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.[9] It was discovered using the radial velocity method. Astrometric measurements using Gaia, published in several papers, show that the inclination of its orbit is about 111 degrees, so its true mass is somewhat higher than that predicted from its minimum mass.[7][10][11][12][5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 7.53±0.032 MJ | 1.946±0.014 | 1,004.7±3.0 | 0.525+0.024 −0.026 |
111.4+4.4 −4.7° |
— |
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