HD 22781

Short description: Star in the constellation Perseus

HD 22781  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Perseus[1]
Right ascension |  03h 40m 49.5246s[2]
Declination | +31° 49′ 34.6489″[2]
Apparent magnitude (V) | 8.78[3]
Characteristics
Evolutionary stage | main-sequence star[4]
Spectral type | K0[3]
Astrometry
Radial velocity (Rv)| 8.26[2] km/s
Proper motion (μ)|  RA: 40.576[2] mas/yr
Dec.: −94.254[2] mas/yr
Parallax (π)| 30.6433 ± 0.1071[5] mas
Distance| 106.4 ± 0.4 ly
(32.6 ± 0.1 pc)
Absolute magnitude (MV)| +6.21[1]
Details[6]
Mass| 0.75±0.02 M☉
Radius| 0.70±0.02 R☉
Surface gravity (log g)| 4.57±0.04 cgs
Temperature| 5175±15 K
Metallicity [Fe/H]| −0.35±0.02 dex
Rotational velocity (v sin i)| 1.73[4] km/s
Age| 4.14±3.63 Gyr
Other designations

BD+31 630, Gaia DR2 217334764042444288, HD 22781, HIP 17187, TYC 2355-246-1, GSC 02355-00246, 2MASS J03404953+3149345[2]

Database references
SIMBAD| data

HD 22781, is a single star about 106 light-years away. It is a K-type main-sequence star. The star’s age is poorly constrained at 4.14±3.63 billion years, but is likely similar to that of the Sun.[6] HD 22781 is heavily depleted in heavy elements, having just 45% of Sun's concentration of iron,[3] yet is comparatively rich in carbon, having 90% of Sun's abundance.[6]

An imaging survey in 2012 has failed to find any stellar companions, suggesting HD 22781 is a single star.[7]

## Planetary system

In 2011 a transiting superjovian planet or brown dwarf b was detected on an extremely eccentric orbit.[4] It is located just outside of the conservative habitable zone of the parent star.[8] Planets around such metal-poor stars are rare; the only three known similar cases are HD 111232 and HD 181720.[9]

In 2012, a radial velocity data review indicated there are no additional giant planets in the system.[10]

The HD 22781 planetary system[4] Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(days) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b | ≥13.65±0.97 MJ | 1.167±0.039 | 528.07±0.14 | 0.8191±0.0023 | —  | —

## References

1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "HD 22781". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22781.
3. ↑ 3.0 3.1 3.2 Maldonado, J.; Villaver, E.; Eiroa, C.; Micela, G. (2019), "Connecting substellar and stellar formation. The role of the host star's metallicity", Astronomy & Astrophysics 624: A94, doi:10.1051/0004-6361/201833827, Bibcode: 2019A&A...624A..94M
4. ↑ 4.0 4.1 4.2 4.3 Díaz, Rodrigo F.; Santerne, Alexandre; Sahlmann, Johannes; Hébrard, Guillaume; Eggenberger, Anne; Santos, Nuno C.; Moutou, Claire; Arnold, Luc et al. (2012), "The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary", Astronomy & Astrophysics A113: 538, doi:10.1051/0004-6361/201117935, Bibcode: 2012A&A...538A.113D
5. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
6. ↑ 6.0 6.1 6.2 Maldonado, J.; Villaver, E. (2017), "Searching for chemical signatures of brown dwarf formation", Astronomy & Astrophysics 602: A38, doi:10.1051/0004-6361/201630120, Bibcode: 2017A&A...602A..38M
7. ↑ Ginski, C.; Mugrauer, M.; Seeliger, M.; Eisenbeiss, T. (2012), "A lucky imaging multiplicity study of exoplanet host stars", Monthly Notices of the Royal Astronomical Society 421 (3): 2498–2509, doi:10.1111/j.1365-2966.2012.20485.x, Bibcode: 2012MNRAS.421.2498G
8. ↑ Agnew, Matthew T.; Maddison, Sarah T.; Thilliez, Elodie; Horner, Jonathan (2017), "Stable habitable zones of single Jovian planet systems", Monthly Notices of the Royal Astronomical Society 471 (4): 4494–4507, doi:10.1093/mnras/stx1449, Bibcode: 2017MNRAS.471.4494A
9. ↑ Adibekyan, Vardan (2019), "Heavy Metal Rules. I. Exoplanet Incidence and Metallicity", Geosciences 9 (3): 105, doi:10.3390/geosciences9030105, Bibcode: 2019Geosc...9..105A
10. ↑ Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J. et al. (2013), "Forever alone? Testing single eccentric planetary systems for multiple companions", The Astrophysical Journal Supplement Series 208 (1): 2, doi:10.1088/0067-0049/208/1/2, Bibcode: 2013ApJS..208....2W

Coordinates:  03h 40m 49.5246s, +31° 49′ 34.6489″

* v
* t
* e

Stars of Perseus

Bayer|

* α (Mirfak)
* β (Algol)
* γ
* δ
* ε
* ζ
* η (Miram)
* θ
* ι
* κ (Misam)
* λ
* μ
* ν
* ξ (Menkib)
* ο (Atik)
* π (Gorgonea Secunda)
* ρ (Gorgonea Tertia)
* σ
* τ
* φ
* ψ
* ω (Gorgonea Quarta)
* b

Flamsteed|

* 1
* 2
* 3
* 4 (g)
* 5
* 7 (χ)
* 8
* 9 (i)
* 10
* 11
* 12
* 14
* 16
* 17
* 20
* 21
* 24
* 29
* 30
* 31
* 32 (l)
* 34
* 36
* 40 (o)
* 42 (n)
* 43 (A)
* 48 (c)
* 49
* 50
* 52 (f)
* 53 (d)
* 54
* 55
* 56
* 57 (m)
* 58 (e)
* 59
* 1 Aur

Variable|

* S
* T
* U
* V
* X
* Z
* RS
* RT
* RV
* RW
* RY
* ST
* SU
* SV
* TZ
* UV
* UX
* UY
* VX
* XX
* XY
* XZ
* YZ
* AB
* AG
* AR
* AS
* AW
* AX
* BM
* DM
* DY
* FO
* GK
* IK
* IP
* IQ
* IU
* IW
* IX
* IZ
* KP
* KS
* KT
* KW
* LX
* V351
* V356
* V357
* V361
* V376
* V380
* V386
* V396
* V392
* V400
* V423
* V432
* V440
* V459
* V461
* V471
* V472
* V473
* V480
* V490
* V492
* V493
* V505
* V509
* V520 (61 And)
* V521
* V545
* V551
* V572
* V573
* V575
* V576
* V621
* V718

HR|

* 470
* 526
* 529
* 538
* 540
* 621
* 641
* 787
* 792
* 810
* 820
* 831
* 842
* 846
* 849
* 864
* 865
* 876
* 885
* 886
* 890
* 894
* 918 (k)
* 920
* 923
* 930
* 949
* 950
* 956
* 964
* 966
* 969
* 973
* 975
* 979
* 986
* 991
* 1001
* 1019
* 1034
* 1037
* 1041
* 1047
* 1051
* 1056
* 1059
* 1074
* 1097
* 1113
* 1127
* 1130
* 1133
* 1141
* 1160
* 1164
* 1176
* 1191
* 1197
* 1198
* 1207
* 1215
* 1226
* 1234
* 1286
* 1301
* 1330
* 1333
* 1337
* 1344
* 1371
* 1390
* 1419
* 1424
* 1482
* 1489
* 1493
* 1500
* 1514

HD|

* 13519
* 14433
* 14434
* 16691
* 16760
* 17092
* 17245
* 17605
* 21684
* 22781
* 23301
* 23596
* 25329
* 26702
* 29587

Other|

* BD+31 643
* BD+48 740
* G 38-29
* G 95-57
* GD 61
* GRO J0422+32
* HAT-P-15
* HAT-P-29
* IRAS 04296+3429
* L1448-IRS2E
* LkHα 101
* LRLL 54361
* NGC 1333 13
* NGC 1333 IRAS 2A
* NGC 1333 IRAS 4A
* NGC 1333 IRAS 4B
* NSV 1436
* PSR B0355+54
* PSR J0357+3205

* List

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