72 Leonis

Short description: Single, variable M-type giant star in the constellation Leo

72 Leonis

Location of 72 Leonis (circled)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Leo
Right ascension |  11h 15m 12.22709s[1]
Declination | +23° 05′ 43.8373″[1]
Apparent magnitude (V) | 4.63[2]
Characteristics
Spectral type | M3 IIb[3]
B−V color index | 1.657±0.003[4]
Variable type | LC[5]
Astrometry
Radial velocity (Rv)| 14.76±0.21[4] km/s
Proper motion (μ)|  RA: −25.56[1] mas/yr
Dec.: −6.00[1] mas/yr
Parallax (π)| 3.40 ± 0.65[1] mas
Distance| approx. 1,000 ly
(approx. 290 pc)
Absolute magnitude (MV)| −2.69[4]
Details
Mass| 3.11[6] M☉
Radius| 195[6] R☉
Luminosity| 5,770[7] L☉
Surface gravity (log g)| 1.16[6] cgs
Temperature| 3,613±48[6] K
Metallicity [Fe/H]| −0.03[6] dex
Age| 400[6] Myr
Other designations

72 Leo, FN Leo, BD+23°2322, FK5 2897, HD 97778, HIP 54951, HR 4362, SAO 81736[8]

Database references
SIMBAD| data
The bright giant star 72 Leonis

72 Leonis is a single[9] variable star in the zodiac constellation of Leo, located roughly 1,000 light years away from the Sun.[1] It has the variable star designation FN Leonis; 72 Leonis is the Flamsteed designation. In Chinese astronomy, 72 Leonis is called 虎賁, Pinyin: Hǔbēn, meaning Emperor’s Bodyguard, because this star is marking itself and stands alone in the Emperor’s Bodyguard asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[10]

This object is visible to the naked eye as a red-hued star with an apparent visual magnitude of 4.56.[4] It is an evolved bright giant with a stellar classification of M3 IIb and was listed as a spectral standard star for that class.[3] The star is classified as an irregular variable of type LC, ranging from Hipparcos magnitude 4.56 down to 4.64.[5] It has a radius 162 to 179[11] times that of the Sun and radiates 5,407[12] times the Sun's luminosity at an effective temperature of around 3,734 K.[13] The star is moving away from the Earth with a heliocentric radial velocity of 15 km/s.[4]

A light curve for FN Leonis, plotted from Hipparcos data [14]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
2. ↑ Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues 2237, Bibcode: 2002yCat.2237....0D.
3. ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
4. ↑ 4.0 4.1 4.2 4.3 4.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
5. ↑ 5.0 5.1 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Baines, Ellyn K.; Armstrong, J. Thomas; Schmitt, Henrique R.; Zavala, R. T.; Benson, James A.; Hutter, Donald J.; Tycner, Christopher; Van Belle, Gerard T. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B.
7. ↑ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society 471 (1): 770, doi:10.1093/mnras/stx1433, Bibcode: 2017MNRAS.471..770M.
8. ↑ "72 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=72+Leo.
9. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
10. ↑ Leo the Lion, Ian Ridpath's Startales, http://www.ianridpath.com/startales/leo.htm, retrieved 2019-02-10.
11. ↑ Kaler, James B. (May 11, 2012), 72 Leonis, http://stars.astro.illinois.edu/sow/72leo.html, retrieved 2017-10-09.
12. ↑ McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
13. ↑ Dyck, H. M. et al. (1998), "Radii and Effective Temperatures for K and M Giants and Supergiants. II", The Astronomical Journal 116 (2): 981, doi:10.1086/300453, Bibcode: 1998AJ....116..981D.
14. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.

* v
* t
* e

Stars of Leo

Bayer|

* α (Regulus)
* β (Denebola)
* γ (Algieba)
* δ (Zosma)
* ε (Algenubi)
* ζ (Adhafera)
* η
* θ (Chertan)
* ι
* κ (Al Minliar al Asad)
* λ (Alterf)
* μ (Rasalas)
* ν
* ξ
* ο (Subra)
* π
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

Flamsteed|

* 3
* 6 (h)
* 7
* 8
* 9
* 10
* 11
* 12
* 13
* 15 (f)
* 18
* 19
* 20
* 21
* 22 (g)
* 23
* 26
* 31 (A)
* 33
* 34
* 35
* 37
* 39
* 40
* 42
* 43
* 44
* 45
* 46
* 48
* 49
* 50
* 51 (m)
* 52 (k)
* 53 (l)
* 54
* 55
* 56
* 57
* 58 (d)
* 59 (c)
* 60 (b)
* 61 (p2)
* 62 (p3)
* 64
* 65 (p4)
* 66
* 67
* 69 (p5)
* 71
* 72
* 73 (n)
* 75
* 76
* 79
* 80
* 81
* 82
* 83
* 85
* 86
* 87 (e)
* 88
* 89
* 90
* 92
* 93
* 95 (o)
* 6 LMi
* 18 LMi
* 49 LMi
* 52 LMi
* 10 Sex
* 11 Sex
* 37 Sex
* 38 Sex

Variable|

* R
* S
* X
* Y
* RR
* RZ
* SS
* ST
* TU
* TV
* UV
* UZ
* XY
* XZ
* AD
* AM
* AP
* AQ
* CE
* CW
* DH
* DK
* DN
* DP
* DR
* DX
* DY
* EE
* EO
* EX
* GX
* HN

HR|

* 3736
* 3792
* 3804
* 3820
* 3869
* 3876
* 3942
* 3969
* 4006
* 4012
* 4032
* 4048
* 4097
* 4197
* 4244
* 4245
* 4249
* 4253 (p1)
* 4303
* 4341
* 4358
* 4394
* 4404
* 4419
* 4459
* 4465
* 4512
* 4531
* 4535
* 4543

HD|

* 81040
* 84680
* 86986
* 88133
* 89307
* 95089
* 96063
* 96372
* 97658
* 99109
* 100456
* 100659
* 100777
* 102272

Gliese|

* Gliese 408
* Gliese 410
* Gliese 436
* GJ 3685

Other|

* BD+20 2457
* HVS 7
* K2-3
* K2-18
* 2MASSI J0937347+293142
* MACS J1149 Lensed Star 1
* PG 1031+234
* PSR B0919+06
* PSR B0943+10
* PSR B0950+08
* PSR B1133+16
* PSR J1022+1001
* SDSS J102915+172927
* WD 1105-048
* Wolf 359 (CN)

* List

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