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{{Short description|Star in the constellation Coma Berenices}}
{{Starbox begin {{Starbox begin
| name=] 108874 | name = HD 108874
}} }}
{{Starbox image {{Starbox image
| image = ] | image = ]
| caption = Orbits around the star HD108874 | caption = Orbits around the star HD108874
}} }}
{{Starbox observe {{Starbox observe
|epoch=J2000 | epoch = J2000
| constell=] | constell = ]<ref name=Anderson_Francis_2012/>
| ra={{RA|12|30|26.8829}} | ra = {{RA|12|30|26.882}}<ref name=GaiaDR3/>
| dec={{DEC|+22|52|47.383}} | dec = {{DEC|+22|52|47.38}}<ref name=GaiaDR3/>
| appmag_v = 8.76<ref name=Anderson_Francis_2012/>
| spectral=G5V
| appmag_v=8.76
}} }}
{{Starbox character {{Starbox character
| type =
| class=G5 V
| class = G5&nbsp;V<ref name="Vogt2005"/> or G9&nbsp;V<ref name=Yoss_Griffin_1997/>
| b-v=0.764
| b-v = 0.738{{±|0.018}}<ref name=Anderson_Francis_2012/>
| u-b=
| v-r=0.4 | u-b =
| r-i=0.4 | v-r =
| r-I =
| variable=”None”
| variable =
}} }}
{{Starbox astrometry {{Starbox astrometry
| radial_v = −30.052{{±|0.0028}}<ref name=Soubiran_et_al_2018/>
| radial_v=-30.7
| prop_mo_ra=-45.05 | prop_mo_ra = 127.469
| prop_mo_dec=-105.39 | prop_mo_dec = −89.912
| pm_footnote = <ref name=GaiaDR3/>
| parallax=14.59
| parallax = 16.7730
| p_error=1.24
| p_error = 0.0443
| absmag_v=3.72
| parallax_footnote = <ref name=GaiaDR3/>
| absmag_v = 4.79<ref name=Anderson_Francis_2012/>
}} }}
{{Starbox detail {{Starbox detail
| mass = 0.996{{±|0.032}}<ref name="Benatti2017"/>
| mass=1
| radius=1.22 | radius = 1.062{{±|0.070}}<ref name="Benatti2017"/>
| luminosity=1.14 | luminosity = 1.19<ref name=Anderson_Francis_2012/>
| gravity = 4.39{{±||0.12}}<ref name="Benatti2017"/>
| temperature=5407
| temperature = 5,585{{±|20}}<ref name="Benatti2017"/>
| metal=<nowiki></nowiki>=+0.14
| metal_fe = 0.18<ref name="Vogt2005"/>
| rotation=37.82 days
| rotation = {{val|40.20|0.15|s=&nbsp;days}}<ref name="Benatti2017"/>
| age=7.26 Giga-
| rotational_velocity = 1.36{{±|0.26}}<ref name="Benatti2017"/>
| age_gyr = 6.48{{±|3.47}}<ref name="Benatti2017"/>
}} }}
{{Starbox catalog {{Starbox catalog
| names=]+23°2466, ] 61028, ] 82344 | names = {{odlist | BD=+23°2466 | HD=108874 | HIP=61028 | PPM=101950 | SAO=82344 }}<ref name="Simbad"/>
}} }}
{{Starbox reference {{Starbox reference
| Simbad=HD+108874 | Simbad = HD+108874
| NSTED = HD+108874
| ARICNS=<!--code-->
}} }}
{{Starbox end}} {{Starbox end}}


'''HD 108874''' is a ] with a pair of orbiting ]s in the northern ] of ]. It is located 194.5&nbsp;]s from the Sun based on ] measurements, but is drifting closer with a ] of −30&nbsp;km/s.<ref name=Soubiran_et_al_2018/> The ] of this star is 4.79,<ref name=Anderson_Francis_2012/> but at that distance the star has an ] of 8.76,<ref name=Anderson_Francis_2012/> making it too faint to be visible to the naked eye. HD 108874 has a relatively large ], traversing the ] at an ] of {{val|0.157|u=arcsecond}}&nbsp;yr<sup>−1</sup>.<ref name=Lepine_Shara_2005/>
'''HD 108874''' is a ] ] (] G5 V) in the ] of ]. It is 223 ]s from Earth and has two ]s that are possibly in a 4:1 ].


The ] of HD 108874 presents as a ] with a ] of G5&nbsp;V.<ref name="Vogt2005"/> (An alternate source gives a class of G9&nbsp;V.)<ref name=Yoss_Griffin_1997/> It is probably billions of years older than the ] although the age is not well constrained. The level of ] in the ] is lower than in the Sun and it is spinning with a low ] of 40&nbsp;days.<ref name="Benatti2017"/> The star has about the same mass as the Sun, but the radius is 6% larger. The abundance of iron, an indicator of the star's ], is 1.18 times that of the Sun.<ref name="Benatti2017"/><ref name="Vogt2005"/> The star is radiating 1.19<ref name=Anderson_Francis_2012/> times the luminosity of the Sun from its ] at an ] of about 5600&nbsp;K.<ref name="Benatti2017"/>
== Star ==
HD 108874 is 2.7 billion years older than our ]. The star has a temperature of 5407 K and luminosity 1.14 ]. It has ] 1.38 times ], meaning this star has greater ] abundance relative to ] and ]. It has mass about the same as the Sun, but the radius is 22% greater.


== Planetary system == ==Planetary system==
In 2003, the ] ] was discovered in the ] by ], ], ], and ].<ref>{{cite journal | url=http://www.iop.org/EJ/article/0004-637X/582/1/455/56131.html | author=Butler ''et al.'' | title=Seven New Keck Planets Orbiting G and K Dwarfs | journal=The ] | year=2003 | volume=582 | issue=1 | pages=455–466 | doi=10.1086/344570}}</ref> This planet receives the ] most similar to ] of any ]. In 2005, further observations revealed this star has another jovian planet orbiting further out, designated as ].<ref>{{cite journal | url=http://www.iop.org/EJ/article/0004-637X/632/1/638/62043.html | author=Vogt ''et al.'' | title=Five New Multicomponent Planetary Systems| journal=The ]| year=2005 | volume=632 | issue=1 | pages=638–658 | doi=10.1086/432901}}</ref> Those two planets are in a 4:1 orbital resonance. This means if HD 108874 b orbits the star four times, then HD 108874 c orbits only once, because the ] for planet c is four times longer than planet b. In 2003, the ] ] was discovered by the US-based team led by ], ], ], and ]. A total of 20 radial velocity observations, obtained at the ] between 1999 and 2002, were used to make the discovery.<ref name="Butler2003"/> In 2005, further observations revealed this star has another jovian planet orbiting further out, designated as ].<ref name="Vogt2005"/> The orbital parameters of both planets were updated in 2009 with additional observations.<ref name="Wright2009"/> There is an additional ] signal in the data at a period of 40 days however this likely caused by the ] period.<ref name="Benatti2017"/>

Those two planets are near, and possibly in a 9:2 ]. This means if HD 108874 b orbits the star nine times, then HD 108874 c orbits twice, because the ] for planet c is four and a half times longer than planet b.<ref name="Benatti2017"/>


{{OrbitboxPlanet begin {{OrbitboxPlanet begin
| table_ref = <ref name="Benatti2017"/>
| table_ref = <ref name="Wright2009"> {{cite journal | url=http://www.iop.org/EJ/abstract/0004-637X/693/2/1084/ | author=Wright ''et al.'' | title=Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems| journal=The ] | volume=693 | issue=2 | year=2009 | pages=1084–1099 | format=abstract | doi=10.1088/0004-637X/693/2/1084 }}()</ref>}}
}}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass = >1.34 ± 0.11 | mass = {{val|1.25|0.10|p=>}}
| period = 394.48 ± 0.60 | period = {{val|395.34|0.19}}
| semimajor = 1.053 ± 0.061 | semimajor = {{val|1.05|0.02}}
| eccentricity = 0.128 ± 0.022 | eccentricity = {{val|0.142|0.011}}
}} }}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass = >1.064 ± 0.099 | mass = {{val|1.09|0.16|p=>}}
| period = 1680 ± 24 | period = {{val|1732.2|9.8}}
| semimajor = 2.77 ± 0.16 | semimajor = {{val|2.81|0.06}}
| eccentricity = 0.273 ± 0.040 | eccentricity = {{val|0.229|0.032}}
}} }}
{{Orbitbox end}} {{Orbitbox end}}
Line 77: Line 84:
*] *]


== References == ==References==
{{Reflist|refs=
{{reflist}}

<ref name="Simbad">{{cite simbad | title=HD 108874 | access-date=2018-10-13 }}</ref>

<ref name=GaiaDR3>{{Cite Gaia DR3|3958951942642583936}}</ref>

<ref name=Soubiran_et_al_2018>{{cite journal
| title=Gaia Data Release 2. The catalogue of radial velocity standard stars
| last1=Soubiran | first1=C. | last2=Jasniewicz | first2=G.
| last3=Chemin | first3=L. | last4=Zurbach | first4=C.
| last5=Brouillet | first5=N. | last6=Panuzzo | first6=P.
| last7=Sartoretti | first7=P. | last8=Katz | first8=D.
| last9=Le Campion | first9=J. -F. | last10=Marchal | first10=O.
| last11=Hestroffer | first11=D. | last12=Thévenin | first12=F.
| last13=Crifo | first13=F. | last14=Udry | first14=S.
| last15=Cropper | first15=M. | last16=Seabroke | first16=G.
| last17=Viala | first17=Y. | last18=Benson | first18=K.
| last19=Blomme | first19=R. | last20=Jean-Antoine | first20=A.
| last21=Huckle | first21=H. | last22=Smith | first22=M.
| last23=Baker | first23=S. G. | last24=Damerdji | first24=Y.
| last25=Dolding | first25=C. | last26=Frémat | first26=Y.
| last27=Gosset | first27=E. | last28=Guerrier | first28=A.
| last29=Guy | first29=L. P. | last30=Haigron | first30=R.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=616 | pages=A7 | year=2018
| bibcode=2018A&A...616A...7S | arxiv=1804.09370
| doi=10.1051/0004-6361/201832795 | s2cid=52952408 }}</ref>

<ref name=Yoss_Griffin_1997>{{cite journal
| title=Radial Velocities and DDO, BV Photometry of Henry Draper G5-M Stars Near the North Galactic Pole
| last1=Yoss | first1=K. M. | last2=Griffin | first2=R. F.
| journal=Journal of Astrophysics and Astronomy
| volume=18 | page=161 | date=September 1997 | issue=2–3
| doi=10.1007/BF02714877 | bibcode=1997JApA...18..161Y | s2cid=123221180 }}</ref>

<ref name=Anderson_Francis_2012>{{cite journal
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | s2cid=119257644
| doi=10.1134/S1063773712050015 | arxiv=1108.4971 }}</ref>

<ref name="Benatti2017">{{cite journal
| title=The GAPS Programme with HARPS-N at TNG. XII. Characterization of the planetary system around HD 108874
| last1=Benatti | first1=S. | last2=Desidera | first2=S.
| last3=Damasso | first3=M. | last4=Malavolta | first4=L.
| last5=Lanza | first5=A. F. | last6=Biazzo | first6=K.
| last7=Bonomo | first7=A. S. | last8=Claudi | first8=R. U.
| last9=Marzari | first9=F. | last10=Poretti | first10=E.
| last11=Gratton | first11=R. | last12=Micela | first12=G.
| last13=Pagano | first13=I. | last14=Piotto | first14=G.
| last15=Sozzetti | first15=A. | last16=Boccato | first16=C.
| last17=Cosentino | first17=R. | last18=Covino | first18=E.
| last19=Maggio | first19=A. | last20=Molinari | first20=E.
| last21=Smareglia | first21=R. | last22=Affer | first22=L.
| last23=Andreuzzi | first23=G. | last24=Bignamini | first24=A.
| last25=Borsa | first25=F. | last26=Di Fabrizio | first26=L.
| last27=Esposito | first27=M. | last28=Martinez Fiorenzano | first28=A.
| last29=Messina | first29=S. | last30=Giacobbe | first30=P.
| display-authors=1 | journal=Astronomy and Astrophysics
| volume=599 | at=A90 | year=2017 | arxiv=1611.09873
| bibcode=2017A&A...599A..90B | doi=10.1051/0004-6361/201629484
| s2cid=119032711 }}</ref>

<ref name="Butler2003">{{cite journal
| title=Seven New Keck Planets Orbiting G and K Dwarfs
| last1=Butler | first1=R. Paul | last2=Marcy | first2=Geoffrey W.
| last3=Vogt | first3=Steven S. | last4=Fischer | first4=Debra A.
| last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Gregory
| last7=Wright | first7=Jason T. | display-authors=1
| journal=The Astrophysical Journal
| volume=582 | issue=1 | pages=455–466 | year=2003
| bibcode=2003ApJ...582..455B | doi=10.1086/344570
| citeseerx=10.1.1.7.6988 | s2cid=17608922 }}</ref>

<ref name="Vogt2005">{{cite journal
| title=Five New Multicomponent Planetary Systems
| last1=Vogt | first1=Steven S. | last2=Butler | first2=R. Paul
| last3=Marcy | first3=Geoffrey W. | last4=Fischer | first4=Debra A.
| last5=Henry | first5=Gregory W. | last6=Laughlin | first6=Greg
| last7=Wright | first7=Jason T. | last8=Johnson | first8=John A.
| display-authors=1 | journal=The Astrophysical Journal
| volume=632 | issue=1 | pages=638–658 | year=2005
| bibcode=2005ApJ...632..638V | doi=10.1086/432901
| s2cid=16509245 }}</ref>

<ref name="Wright2009">{{cite journal
| title=Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems
| last1=Wright | first1=J. T. | last2=Upadhyay | first2=S.
| last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A.
| last5=Ford | first5=Eric B. | last6=Johnson | first6=John Asher
| display-authors=1 | journal=The Astrophysical Journal
| volume=693 | issue=2| pages=1084–1099 | year=2009
| arxiv=0812.1582 | bibcode=2009ApJ...693.1084W
| doi=10.1088/0004-637X/693/2/1084 | s2cid=18169921 }}</ref>

<ref name=Lepine_Shara_2005>{{cite journal
| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)
| last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M.
| journal=The Astronomical Journal
| volume=129 | issue=3 | pages=1483–1522 | date=March 2005
| doi=10.1086/427854 | bibcode=2005AJ....129.1483L
| arxiv=astro-ph/0412070 | s2cid=2603568 }}</ref>

}}

==External links==
* {{Webarchive|url=https://web.archive.org/web/20160505160348/http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ |date=2016-05-05 }} by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona


== External links ==
* {{cite web|url=http://exoplanet.eu/star.php?st=HD+108874 |title=HD 108874 |work=The Extrasolar Planets Encyclopaedia}}
* {{cite web|url=http://www.extrasolar.net/startour.asp?StarCatId=normal&StarId=159 |title=HD 108874 |work=Extrasolar Visions}}
* by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
{{Sky|12|30|26.8829|+|22|52|47.383|223.4}} {{Sky|12|30|26.8829|+|22|52|47.383|223.4}}
] {{Stars of Coma Berenices}}
]
]
]
]


] {{DEFAULTSORT:HD 108874}}
<!-- Properties -->
]
]
]
]
]
<!-- Location/catalogues -->
]
]
]
]

Latest revision as of 09:33, 3 July 2024

Star in the constellation Coma Berenices
HD 108874

Orbits around the star HD108874
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension 12 30 26.882
Declination +22° 52′ 47.38″
Apparent magnitude (V) 8.76
Characteristics
Spectral type G5 V or G9 V
B−V color index 0.738±0.018
Astrometry
Radial velocity (Rv)−30.052±0.0028 km/s
Proper motion (μ) RA: 127.469 mas/yr
Dec.: −89.912 mas/yr
Parallax (π)16.7730 ± 0.0443 mas
Distance194.5 ± 0.5 ly
(59.6 ± 0.2 pc)
Absolute magnitude (MV)4.79
Details
Mass0.996±0.032 M☉
Radius1.062±0.070 R☉
Luminosity1.19 L☉
Surface gravity (log g)4.39± cgs
Temperature5,585±20 K
Metallicity 0.18 dex
Rotation40.20±0.15 days
Rotational velocity (v sin i)1.36±0.26 km/s
Age6.48±3.47 Gyr
Other designations
BD+23°2466, HD 108874, HIP 61028, SAO 82344, PPM 101950
Database references
SIMBADdata
Exoplanet Archivedata

HD 108874 is a star with a pair of orbiting exoplanets in the northern constellation of Coma Berenices. It is located 194.5 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −30 km/s. The absolute magnitude of this star is 4.79, but at that distance the star has an apparent visual magnitude of 8.76, making it too faint to be visible to the naked eye. HD 108874 has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.157″ yr.

The spectrum of HD 108874 presents as a G-type main-sequence star with a stellar classification of G5 V. (An alternate source gives a class of G9 V.) It is probably billions of years older than the Sun although the age is not well constrained. The level of magnetic activity in the chromosphere is lower than in the Sun and it is spinning with a low rotation period of 40 days. The star has about the same mass as the Sun, but the radius is 6% larger. The abundance of iron, an indicator of the star's metallicity, is 1.18 times that of the Sun. The star is radiating 1.19 times the luminosity of the Sun from its photosphere at an effective temperature of about 5600 K.

Planetary system

In 2003, the jovian planet HD 108874 b was discovered by the US-based team led by Paul Butler, Geoffrey Marcy, Steven Vogt, and Debra Fischer. A total of 20 radial velocity observations, obtained at the W. M. Keck Observatory between 1999 and 2002, were used to make the discovery. In 2005, further observations revealed this star has another jovian planet orbiting further out, designated as HD 108874 c. The orbital parameters of both planets were updated in 2009 with additional observations. There is an additional radial velocity signal in the data at a period of 40 days however this likely caused by the stellar rotation period.

Those two planets are near, and possibly in a 9:2 orbital resonance. This means if HD 108874 b orbits the star nine times, then HD 108874 c orbits twice, because the orbital period for planet c is four and a half times longer than planet b.

The HD 108874 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >1.25±0.10 MJ 1.05±0.02 395.34±0.19 0.142±0.011 — —
c >1.09±0.16 MJ 2.81±0.06 1732.2±9.8 0.229±0.032 — —

See also

References

  1. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901. S2CID 16509245.
  4. ^ Yoss, K. M.; Griffin, R. F. (September 1997). "Radial Velocities and DDO, BV Photometry of Henry Draper G5-M Stars Near the North Galactic Pole". Journal of Astrophysics and Astronomy. 18 (2–3): 161. Bibcode:1997JApA...18..161Y. doi:10.1007/BF02714877. S2CID 123221180.
  5. ^ Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
  6. ^ Benatti, S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG. XII. Characterization of the planetary system around HD 108874". Astronomy and Astrophysics. 599. A90. arXiv:1611.09873. Bibcode:2017A&A...599A..90B. doi:10.1051/0004-6361/201629484. S2CID 119032711.
  7. "HD 108874". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-13.
  8. Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
  9. Butler, R. Paul; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal. 582 (1): 455–466. Bibcode:2003ApJ...582..455B. CiteSeerX 10.1.1.7.6988. doi:10.1086/344570. S2CID 17608922.
  10. Wright, J. T.; et al. (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal. 693 (2): 1084–1099. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084. S2CID 18169921.

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