K2-371

Short description: Star in the constellation Cancer

K2-371  Observation data
Epoch J2000.0 Equinox (celestial coordinates)

Constellation | Cancer
Right ascension |  08h 32m 16.1124s[1]
Declination | +11° 37′ 50.5893″[1]
Apparent magnitude (V) | 14.64±0.06[2]
Characteristics
Spectral type | K3 V[3]
B−V color index | +1.00[2]
R−I color index | +0.28[2]
Variable type | Planetary transit[4]
Astrometry
Proper motion (μ)|  RA: −9.507[1] mas/yr
Dec.: −2.164[1] mas/yr
Parallax (π)| 2.235 ± 0.0232[1] mas
Distance| 1,460 ± 20 ly
(447 ± 5 pc)
Details
Mass| 0.96+0.44−0.30[5] M☉
Radius| 0.72+0.09−0.01[3] R☉
Luminosity| 0.304[6] L☉
Surface gravity (log g)| 4.68±0.15[5] cgs
Temperature| 4952±122[6] K
Metallicity [Fe/H]| −0.11±0.23[5] dex
Rotational velocity (v sin i)| 3.2[7] km/s
Other designations

EPIC 211399359, Gaia EDR3 602466302541172736, K2-371

Database references
SIMBAD| data
Exoplanet Archive| data
Extrasolar Planets
Encyclopaedia| data

K2-371 (EPIC 211399359) is a star in the equatorial zodiac constellation Cancer. It has an apparent magnitude of 14.64, requiring a powerful telescope to be seen. Parallax measurements place the object at a distance of 1,460 light years.

K2-371 has a stellar classification of K3 V,[3] indicating that it is an ordinary K-type main-sequence star. It has 96% the mass of the Sun[5] and 72% the radius of the Sun.[5] It shines with a luminosity 30.4% that of the Sun[6] from its photosphere at an effective temperature of 4,952 K,[6] giving an orange hue. Unlike most planetary hosts, K2-371 is slightly metal deficent with a poorly constrained iron abundance 77% that of the Sun,[5] and spins modestly with a projected rotational velocity of 3.2 km/s.[7]

## Planetary System

In 2016, K2-371 was selected as a target for exoplanets. A group of astronomers happened to find a hot Jupiter orbiting the star with a period of 3.115 days.[8] Unlike most transiting planets, K2-371b's orbital eccentricity and inclination is unknown.[5]

The K2-371 planetary system  Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(days) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b (unconfirmed) | —  | 0.08518[5] | 3.115[8] | —  | —  | 1.16±0.08[5] RJ

## Reference

1. ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (14 January 2013). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal 145 (2): 44. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z.
3. ↑ 3.0 3.1 3.2 Dressing, Courtney D.; Hardegree-Ullman, Kevin; Schlieder, Joshua E.; Newton, Elisabeth R.; Vanderburg, Andrew; Feinstein, Adina D.; Duvvuri, Girish M.; Arnold, Lauren et al. (30 July 2019). "Characterizing K2 Candidate Planetary Systems Orbiting Low-mass Stars. IV. Updated Properties for 86 Cool Dwarfs Observed during Campaigns 1–17". The Astronomical Journal 158 (2): 87. doi:10.3847/1538-3881/ab2895. PMID 35095106. Bibcode: 2019AJ....158...87D.
4. ↑ Barros, S. C. C.; Demangeon, O.; Deleuil, M. (October 2016). "New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission". Astronomy & Astrophysics 594: A100. doi:10.1051/0004-6361/201628902. ISSN 0004-6361. Bibcode: 2016A&A...594A.100B.
5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Christiansen, Jessie L. et al. (9 May 2022). "Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2–18". The Astronomical Journal 163 (6): 244. doi:10.3847/1538-3881/ac5c4c. ISSN 0004-6256. Bibcode: 2022AJ....163..254C.
6. ↑ 6.0 6.1 6.2 6.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
7. ↑ 7.0 7.1 Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Fulton, Benjamin J.; Howard, Andrew W. et al. (14 December 2017). "Planet Candidates from K2 Campaigns 5–8 and Follow-up Optical Spectroscopy". The Astronomical Journal 155 (1): 21. doi:10.3847/1538-3881/aa9b83. Bibcode: 2018AJ....155...21P.
8. ↑ 8.0 8.1 Pope, Benjamin J. S.; Parviainen, Hannu; Aigrain, Suzanne (8 June 2016). "Transiting exoplanet candidates fromK2Campaigns 5 and 6". Monthly Notices of the Royal Astronomical Society 461 (4): 3399–3409. doi:10.1093/mnras/stw1373. ISSN 0035-8711. Bibcode: 2016MNRAS.461.3399P.

* v
* t
* e

Cancer constellation

Stars (list)|

| Bayer|

* α (Acubens)
* β (Tarf)
* γ (Asellus Borealis)
* δ (Asellus Australis)
* ε (Meleph)
* ζ (Tegmine)
* η
* θ
* ι
* κ
* λ (Piautos)
* μ1
* μ2
* ν
* ξ (Nahn)
* ο1
* ο2
* π1
* π2
* ρ1 (Copernicus)
* ρ2
* σ1
* σ2
* σ3
* τ
* υ1
* υ2
* φ1
* φ2
* χ
* ψ1
* ψ2
* ω1

|

Flamsteed|

* 1
* 3
* 4 (ω2)
* 5
* 7
* 8
* 11
* 12
* 15
* 20 (d1)
* 21
* 24
* 25 (d2)
* 27
* 28
* 29
* 34
* 35
* 36 (c)
* 37
* 38
* 39
* 40
* 42
* 44
* 45 (A1)
* 46
* 49 (b)
* 50 (A2)
* 52
* 53
* 54
* 57
* 60
* 61
* 66
* 67
* 68
* 70
* 71
* 75
* 78
* 79
* 80
* 83
* 1 LMi
* 2 LMi
* 3 LMi
* 4 LMi

Variable|

* R
* S
* T
* U
* V
* X
* RS
* RU
* RX
* RZ
* SS
* SY
* TT
* TU
* TW
* TX
* UU
* VZ
* WY
* YZ
* AC
* AD
* AH
* AK
* AR
* AT
* AZ
* BN
* BQ
* BR
* BS
* BU
* BW
* BX
* CC
* CU
* CY
* DW
* DX
* EG
* EP
* ES
* EV
* EW
* EX
* FZ
* GY
* HU
* HV

HR|

* 3104
* 3115
* 3125
* 3127
* 3158
* 3164
* 3198
* 3201
* 3222
* 3228
* 3231
* 3252
* 3264
* 3306
* 3376
* 3380
* 3394
* 3395
* 3424
* 3428
* 3504
* 3558
* 3567
* 3599
* 3606
* 3617
* 3620
* 3635
* 3657
* 3689
* 3707

HD|

* 67542
* 69629
* 72115
* 73534
* 74721
* 76908
* 79498

Other|

* ADS 7284
* G 9-38
* HAT-P-31
* HIP 41378
* LHS 2090
* PSR B0823+26
* RX J0806.3+1527
* YBP 1194
* WDJ0914+1914

Star clusters|

| Open|

* Beehive Cluster
* Messier 67
* NGC 2664
* NGC 2678

|

Nebulae|

| Planetary|

* Abell 30

|

Galaxies|

| NGC|

* 2503
* 2507
* 2512
* 2513
* 2514
* 2522
* 2526
* 2530
* 2535
* 2536
* 2540
* 2545
* 2553
* 2554
* 2556
* 2557
* 2558
* 2560
* 2562
* 2563
* 2565
* 2569
* 2570
* 2572
* 2575
* 2576
* 2577
* 2581
* 2582
* 2592
* 2593
* 2594
* 2595
* 2596
* 2598
* 2599
* 2604
* 2604B
* 2607
* 2608
* 2611
* 2619
* 2620
* 2621
* 2622
* 2623
* 2624
* 2625
* 2628
* 2647
* 2648
* 2651
* 2657
* 2661
* 2667
* 2672
* 2673
* 2677
* 2679
* 2680
* 2711
* 2720
* 2725
* 2728
* 2730
* 2731
* 2734
* 2735
* 2735A
* 2737
* 2738
* 2741
* 2743
* 2744
* 2744A
* 2745
* 2747
* 2749
* 2750
* 2751
* 2752
* 2753
* 2761
* 2764
* 2766
* 2773
* 2774
* 2775
* 2777
* 2783
* 2783B
* 2786
* 2789
* 2790
* 2791
* 2794
* 2795
* 2796
* 2797
* 2801
* 2802
* 2803
* 2804
* 2807
* 2807A
* 2809
* 2812
* 2813
* 2819
* 2824
* 2843

|

Other|

* B2 0827+243
* 3C 190
* 3C 191
* 3C 192
* 3C 207
* 3C 212
* 3C 215
* 4C +29.30
* Mrk 704
* OI 090.4
* OJ 287
* QSO B0820+225
* QSO B0839+187

Galaxy
clusters|

* Abell 671
* Cancer Cluster
* Musket Ball Cluster

Other|

* GRB 021211
* SN 1999aa
* SN 2002lt

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