HD 68988

Short description: Star in the constellation Ursa Major

HD 68988 / Násti  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Ursa Major[1]
Right ascension |  08h 18m 22.17286s[2]
Declination | +61° 27′ 38.5950″[2]
Apparent magnitude (V) | 8.20[1]
Characteristics
Spectral type | G0V[3] or G2V[4] or G2IV[1]
B−V color index | 0.652±0.015[1]
Astrometry
Radial velocity (Rv)| −69.45±0.11[1] km/s
Proper motion (μ)|  RA: 128.266[2] mas/yr
Dec.: 30.427[2] mas/yr
Parallax (π)| 16.5598 ± 0.0221[2] mas
Distance| 197.0 ± 0.3 ly
(60.39 ± 0.08 pc)
Absolute magnitude (MV)| 4.52[1]
Details[5]
Mass| 1.16±0.01 M☉
Radius| 1.08±0.01 R☉
Luminosity| 1.297±0.002 L☉
Surface gravity (log g)| 4.42±0.01 cgs
Temperature| 5919±11 K
Metallicity [Fe/H]| 0.29±0.01[1] dex
Rotational velocity (v sin i)| 6.4[6] km/s
Age| 1.0±0.4 Gyr
Other designations

Násti, BD+61°1038, HD 68988, HIP 40687, SAO 14494[7]

Database references
SIMBAD| data
Exoplanet Archive| data

HD 68988 is a star in the northern constellation of Ursa Major. It has the proper name Násti, which means star in the Northern Sami language. The name was selected in the NameExoWorlds campaign by Norway, during the 100th anniversary of the IAU.[8][9] HD 68988 is too faint to be seen with the naked eye, having an apparent visual magnitude of 8.20.[1] The star is located at a distance of 197 light-years from the Sun based on parallax. It is drifting closer with a radial velocity of −69 km/s and is predicted to come as close as 78 light-years in 617,000 years.[1]

The stellar classification of HD 68988 has been given as G0V,[3] G2V,[4] and G2IV.[1] The age of this star was estimated as six billion years in 2002,[4] but was later revised down to one billion years in 2015.[5] It is rotating slowly and is chromospherically inactive.[10] The star has 16% more mass than the Sun and an 8% greater radius with a high metallicity; what astronomers term the abundance of heavier elements. It is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,919 K.[5]

## Planetary system

There are two exoplanets: HD 68988 b was discovered in 2002[4] and HD 68988 c was discovered in 2006.[11] The orbit of the inner exoplanet is surprisingly eccentric for such a close in orbit, and over time it may become circularized,[10] although orbital parameters were significantly revised in 2021, resulting in wider orbit.[12] In 2025, the true mass of the planet was measured using astrometry, consistent with that of Rosenthal et al. (2021).[13]

The HD 68988 planetary system[13] Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(years) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b / Albmi | >1.972+0.017
−0.018 MJ | 0.0710+0.0012
−0.0014 | 0.017183893(34) | 0.1533+0.0049
−0.0048 | —  | —
c | 15.03+0.90
−0.75 MJ | 12.1±1.1 | 38.1+5.3
−4.9 | 0.399+0.046
−0.049 | 93+19
−23° | —

## See also

* List of extrasolar planets

## References

1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
3. ↑ 3.0 3.1 van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal 694 (2): 1085–1098. doi:10.1088/0004-637X/694/2/1085. Bibcode: 2009ApJ...694.1085V.
4. ↑ 4.0 4.1 4.2 4.3 Vogt, Steven S. et al. (2002). "Ten Low-Mass Companions from the Keck Precision Velocity Survey". The Astrophysical Journal 568 (1): 352–362. doi:10.1086/338768. Bibcode: 2002ApJ...568..352V.
5. ↑ 5.0 5.1 5.2 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html.
6. ↑ Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 19. doi:10.3847/1538-3881/153/1/21. 21. Bibcode: 2017AJ....153...21L.
7. ↑ "HD 68988". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+68988.
8. ↑ "Approved names" (in en). http://www.nameexoworlds.iau.org/final-results.
9. ↑ "International Astronomical Union | IAU". https://www.iau.org/news/pressreleases/detail/iau1912/.
10. ↑ 10.0 10.1 Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B.
11. ↑ Wright, J. T. et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal 657 (1): 533–545. doi:10.1086/510553. Bibcode: 2007ApJ...657..533W.
12. ↑ Rosenthal, Lee J.; Fulton, Benjamin J.; Hirsch, Lea A.; Isaacson, Howard T.; Howard, Andrew W.; Dedrick, Cayla M.; Sherstyuk, Ilya A.; Blunt, Sarah C. et al. (2021). "The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades". The Astrophysical Journal Supplement Series 255 (1): 8. doi:10.3847/1538-4365/abe23c. Bibcode: 2021ApJS..255....8R.
13. ↑ 13.0 13.1 An, Qier; Brandt, Timothy D.; Brandt, G. Mirek; Venner, Alexander (2025-08-11). "Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and A Validation of Gaia Non-Single Star Solutions". The Astrophysical Journal Supplement Series.

## External links

* "Notes for star HD 68988". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+68988. Retrieved 2008-08-25.

Coordinates:  08h 18m 22.1731s, +61° 27′ 38.599″

* v
* t
* e

Stars of Ursa Major

Bayer|

* α (Dubhe)
* β (Merak)
* γ (Phecda)
* δ (Megrez)
* ε (Alioth)
* ζ (Mizar)
* η (Alkaid)
* θ
* ι (Talitha)
* κ (Alkaphrah)
* λ (Tania Borealis)
* μ (Tania Australis)
* ν (Alula Borealis)
* ξ (Alula Australis)
* ο (Muscida)
* π1
* π2
* ρ
* σ1
* σ2
* τ
* υ
* φ
* χ (Taiyangshou)
* ψ
* ω

Flamsteed|

* 2 (A)
* 5 (b)
* 6
* 15 (f)
* 16 (c)
* 17
* 18 (e)
* 19
* 20
* 21
* 22
* 23 (h)
* 24 (d)
* 26
* 27
* 28
* 31
* 32
* 35
* 36
* 37
* 38
* 39
* 40
* 41
* 42
* 43
* 44
* 46
* 47 (Chalawan)
* 49
* 51
* 55
* 56
* 57
* 58
* 59
* 60
* 61
* 62
* 65
* 66
* 67
* 68
* 70
* 71
* 72
* 73
* 74
* 75
* 76
* 78
* 80 (Alcor)
* 81
* 82
* 83
* 84
* 86
* 55 Cam
* 56 Cam
* 57 Cam
* 1 CVn
* 14 LMi
* 15 LMi
* 25 LMi
* 47 LMi
* 37 Lyn
* 39 Lyn
* 41 Lyn (Intercrus)
* 44 Lyn

Variable|

* R
* T
* U
* W
* Z
* RV
* ST
* SU
* SW
* SX
* TU
* TX
* TY
* UX
* UY
* VV
* VX
* VY
* XY
* ZZ
* AA
* AB
* AE
* AN
* AR
* AW
* BC
* BE
* BM
* BZ
* CG
* CH
* CO
* CQ
* CY
* DH
* DI
* DM
* DN
* DV
* DW
* EE
* EG
* EI
* EK
* EN
* EP
* ER
* ET
* EU
* EV
* EZ
* IY
* KS
* NQ
* NY

HR|

* 3236
* 3263
* 3303
* 3332
* 3400
* 3401
* 3405
* 3408
* 3436
* 3470
* 3506
* 3592
* 3603
* 3608
* 3645
* 3676
* 3725
* 3747
* 3824
* 3838
* 3854
* 3855
* 3859
* 3885
* 3911
* 3918
* 3922
* 3929
* 3939
* 3954
* 3958
* 4044
* 4046
* 4051
* 4052
* 4067
* 4096
* 4098
* 4103
* 4108
* 4132
* 4165
* 4176
* 4181
* 4191
* 4215
* 4242
* 4243
* 4264
* 4275
* 4278
* 4280
* 4283
* 4285
* 4286
* 4336
* 4340
* 4345
* 4351
* 4367
* 4383
* 4388
* 4391
* 4407
* 4412
* 4421
* 4424
* 4435
* 4439
* 4452
* 4457
* 4474
* 4481
* 4482
* 4486
* 4493
* 4500
* 4521
* 4536
* 4545
* 4562
* 4569
* 4574
* 4581
* 4584
* 4593
* 4610
* 4672
* 4767
* 4840
* 4859
* 4867
* 4917
* 4936
* 4953
* 5070
* 5076
* 5085
* 5126
* 5148
* 5169
* 5077
* 5213
* 5216
* 5256
* 5280
* 5302

HD|

* 68988
* 74389
* 80461
* 80606
* 80607
* 82408
* 82969
* 83564
* 88609
* 89221
* 93551
* 95572
* 96127
* 98618
* 99706
* 100018
* 102956
* 115043
* 118203
* 118970
* 233604

Gliese|

* GJ 3512
* Gliese 338
* Gliese 412
* Gliese 424
* Gliese 450

Other|

* ADS 7251
* Feige 34
* Feige 48
* Feige 55
* G 119-62
* G 195-19
* G 196-3
* Groombridge 1618
* Groombridge 1830
* HAT-P-3
* HAT-P-13
* HAT-P-21
* HAT-P-22
* HIP 57050
* HIP 57274
* Holmberg IX X-1
* Lalande 21185
* M82 X-1
* M82 X-2
* PG 1219+534
* PG 1351+489
* PSR B1112+50
* PSR J1012+5307
* Sidus Ludoviciana
* Winnecke 4
* WISE 1405+5534
* XTE J1118+480

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