Wolf 424

Star in constellation of Virgo

Wolf 424

Wolf 424

Location of Wolf 424 in the constellation Virgo

Observation data
Epoch J2000      Equinox J2000
Constellation | Virgo[1]
Right ascension | 12h 33m 17.38s[2]
Declination | +09° 01′ 15.8″[2]
Apparent magnitude (V) | A: 13.22 ± 0.01
B: 13.21 ± 0.01[3]
Characteristics
Spectral type | dM6e/dM6e[4]
Variable type | Flare stars[4]
Astrometry
Radial velocity (Rv)| −2[5] km/s
Parallax (π)| 227.041±0.389 mas[6]
Distance| 14.37 ± 0.02 ly
(4.404 ± 0.008 pc)
Wolf 424 A
Proper motion (μ)|  RA: −1,795.661 mas/yr[7]
Dec.: 217.789 mas/yr[7]
Absolute magnitude (MV)| 15.03[8]
Wolf 424 B
Proper motion (μ)|  RA: −1,710.468 mas/yr[9]
Dec.: 203.098 mas/yr[9]
Absolute magnitude (MV)| 15.02[8]
Orbit[10]
Primary| Wolf 424 A
Companion| Wolf 424 B
Period (P)| 15.804±0.026 yr
Semi-major axis (a)| 0.9167″±0.0017″[10]
(4.062±0.098 AU)[3]
Eccentricity (e)| 0.301±0.002
Inclination (i)| 103.3±0.7°
Longitude of the node (Ω)| 143.5±0.1°
Periastron epoch (T)| 1992.297±0.056[3]
Argument of periastron (ω)
(secondary)| 350.7±0.5°
Details

Mass| 0.1379±0.0023[6] M☉
Radius| 0.150±0.019[11] R☉
Temperature| 2,966±7[12] K

Mass| 0.1258±0.0022[6] M☉
Radius| 0.153±0.019[11] R☉
Temperature| 2,966±7[12] K
Other designations
FL Vir, GJ 473, Ci 20 716, G 12-43, G 60-14, LFT 923, LHS 333, LTT 13546, PLX 2890, Wolf 424, GCRV 7553, GSC 00874-00306, Cl* Melotte 25 EGG 43, USNO-B1.0 0990-00217846, VVO 74, 2E 2769, JP11 5148, JP11 5149[13]
Database references
SIMBAD| The system
| A
| B
ARICNS| A
| B

Wolf 424 is a binary star system comprising two red dwarf stars. The stars are located at a distance of 14.37 light-years and hence are among the nearest stars, but due to their faint intrinsic brightness, they are not visible to the naked eye. Wolf 424 is located in the constellation Virgo, between the stars ε Virginis and ο Virginis.

## Description

[edit]

An ultraviolet band light curve for FL Virginis, adapted from Moffett (1972).[14] The plot shows intensity above the star's quiescent intensity.

The close binary nature of this star was discovered by Dutch American astronomer Dirk Reuyl in 1941, based upon an elongation of the star found in photographs.[3] The two stars in the Wolf 424 system orbit about each other with a semi-major axis of 4.1 AU and an eccentricity of 0.3. The stars have an orbital period of 15.5 years and have a combined apparent magnitude of about 12.5.

Wolf 424A and Wolf 424B are similar-spectrum and similar-size stars, both red dwarfs with masses of 0.138 and 0.126 M☉ and radii of 0.150 and 0.153 R☉, respectively.[11] In 1967, it was discovered that both are flare stars that undergo random increases in luminosity. The system has been designated FL Virginis, and may experience sunspot activity. The stars may undergo variation in the level of flare activity over periods lasting several years.[4]

## References

[edit]

1. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
2. ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C. S2CID 115529446.
3. ^ a b c d Torres, Guillermo; et al. (January 1999). "The Nearby Low-Mass Visual Binary Wolf 424". The Astronomical Journal. 117 (1): 562–573\. Bibcode:1999AJ....117..562T. doi:10.1086/300708.
4. ^ a b c Pettersen, B. R. (May 2006). "Flare variability in the close binary FL Vir". Monthly Notices of the Royal Astronomical Society. 368 (3): 1392–1394\. Bibcode:2006MNRAS.368.1392P. doi:10.1111/j.1365-2966.2006.10210.x.
5. ^ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
6. ^ a b c Chevalier, S.; Babusiaux, C.; et al. (October 2023). "Binary masses and luminosities with Gaia DR3". Astronomy & Astrophysics. 678: A19. arXiv:2307.16719. Bibcode:2023A&A...678A..19C. doi:10.1051/0004-6361/202347111.
7. ^ 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.
8. ^ a b Staff (January 1, 2010). "List of the Nearest 100 Stellar Systems". Research Consortium on Nearby Stars. Retrieved 2011-07-01.
9. ^ 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.
10. ^ a b Benedict, G. F.; Henry, T. J.; Franz, O. G.; McArthur, B. E.; Wasserman, L. H.; Jao, Wei-Chun; Cargile, P. A.; Dieterich, S. B.; Bradley, A. J.; Nelan, E. P.; Whipple, A. L. (2016). "The Solar Neighborhood. XXXVII. The Mass–Luminosity Relation for Main-Sequence M Dwarfs". The Astronomical Journal. 152 (5): 141. arXiv:1608.04775. Bibcode:2016AJ....152..141B. doi:10.3847/0004-6256/152/5/141. S2CID 54029447.
11. ^ a b c Cifuentes, C.; Caballero, J. A.; González-Payo, J.; Amado, P. J.; Béjar, V. J. S.; Burgasser, A. J.; Cortés-Contreras, M.; Lodieu, N.; Montes, D.; Quirrenbach, A.; Reiners, A.; Ribas, I.; Sanz-Forcada, J.; Seifert, W.; Zapatero Osorio, M. R. (January 2025). "CARMENES input catalogue of M dwarfs. IX. Multiplicity from close spectroscopic binaries to ultra-wide systems". Astronomy and Astrophysics. 693: A228. Bibcode:2025A&A...693A.228C. doi:10.1051/0004-6361/202452527. ISSN 0004-6361.
12. ^ a b Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass–Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 56. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104.
13. ^ "V* FL Vir". SIMBAD. Centre de données astronomiques de Strasbourg.
14. ^ Moffett, T. J. (January 1973). "Wolf 424: a neglected flare star". Monthly Notices of the Royal Astronomical Society. 164: 11–20\. Bibcode:1973MNRAS.164...11M. doi:10.1093/mnras/164.1.11.

## Further reading

[edit]

* W. D. Heintz, "Astrometric study of 4 binary stars", 1972, Astronomical Journal, 77, 160.
* Cohen, E. Richard; David R. Lide; George L. Trigg (2003). AIP Physics Desk Reference. Birkhäuser. p. 100\. ISBN 0-387-98973-0.

## External links

[edit]

* Wolf 424 Data page
* Wolf 424 AB
* A NASA image of Wolf 424 AB

* v
* t
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← Celestial objects within 10–15 light-years →

| Primary member type|

Celestial objects by systems.

| Subgiant stars|

| F-type|

* Procyon (Alpha Canis Minoris) (11.402±0.032 ly)
* white dwarf B

|

| Main-sequence
stars|

| G-type|

* Tau Ceti (11.9118±0.0074 ly)
* 4 (8?) planets: (b), (c), (d), e, f, g, h, (i)

|

K-type|

* Epsilon Eridani (Ran) (10.4749±0.0037 ly)
* 1 (2?) planets: b (Ægir), c?
* 61 Cygni (11.4039±0.0012 ly)
* K-type main-sequence star B
* Epsilon Indi (11.8670±0.0041 ly)
* 2 T-type brown dwarfs: Ba, Bb
* planet Ab

M-type
(red dwarfs)|

* Ross 248 (10.3057±0.0014 ly)
* Lacaille 9352 (10.7241±0.0007 ly)
* 2 (3?) planets: b, c, d?
* Ross 128 (11.0074±0.0011 ly)
* planet b
* EZ Aquarii (11.109±0.034 ly)
* 2 red dwarfs: B, C
* Struve 2398 (11.4908±0.0009 ly)
* red dwarf B
* 1 (3?) planets: Ab, Bb?, Bc?
* Groombridge 34 (11.6191±0.0008 ly)
* red dwarf B
* 2 planets: Ab, Ac
* DX Cancri (11.6797±0.0027 ly)
* GJ 1061 (11.9839±0.0014 ly)
* 3 planets: b, c, d
* YZ Ceti (12.1222±0.0015 ly)
* 3 planets: b, c, d
* Luyten's Star (12.3485±0.0019 ly)
* 2 (4?) planets: b, c, d?, e?
* Teegarden's Star (12.4970±0.0045 ly)
* 3 planets: b, c, d
* Kapteyn's Star (12.8308±0.0008 ly)
* Lacaille 8760 (12.9472±0.0018 ly)
* SCR 1845−6357 (13.0638±0.0070 ly)
* T-type brown dwarf B
* Kruger 60 (13.0724±0.0052 ly)
* red dwarf B
* DENIS J1048−3956 (13.1932±0.0027 ly)
* Ross 614 (13.363±0.040 ly)
* red dwarf B
* Wolf 1061 (14.0500±0.0016 ly)
* 3 planets: b, c, d
* Gliese 1 (14.1747±0.0022 ly)
* TZ Arietis (14.5780±0.0046 ly)
* planet b
* Wolf 424 (14.595±0.031 ly)
* red dwarf B
* Gliese 687 (14.8395±0.0014 ly)
* 2 planets: b, c
* Gliese 674 (14.8492±0.0018 ly)
* planet b
* LHS 292 (14.8706±0.0041 ly)

| Degenerate
stars|

| White dwarfs|

* van Maanen 2 (14.0718±0.0011 ly)

|

| Brown dwarfs|

| T-type|

* UGPS J0722-0540 (13.43±0.13 ly)

|

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Constellation of Virgo

* List of stars in Virgo

Stars|

| Bayer|

* α (Spica)
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* γ (Porrima)
* δ (Minelauva)
* ε (Vindemiatrix)
* ζ (Heze)
* η (Zaniah)
* θ
* ι (Syrma)
* κ (Kang)
* λ (Khambalia)
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ
* υ
* φ (Elgafar)
* χ
* ψ
* ω

|

Flamsteed|

* 4 (A1)
* 6 (A2)
* 7 (b)
* 10
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* 12
* 13
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* 16 (c)
* 17
* 20
* 21 (q)
* 25 (f)
* 27
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* 31 (d1)
* 32 (d2)
* 33
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* 35
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* 39
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* 44 (k)
* 46
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* 50
* 53
* 54
* 55
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* 57
* 58
* 59 (e)
* 61
* 62
* 63
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* 69
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* 73
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* 75
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* 77
* 78 (o)
* 80
* 81
* 82 (m)
* 83
* 84
* 85
* 86
* 87
* 88
* 89
* 90 (p)
* 92
* 94
* 95
* 96
* 97
* 103
* 104
* 106
* 108
* 109
* 110
* 1 Ser (M Ser)
* 2 Ser

Variable|

* R
* S
* W
* RT
* SS
* SW
* AG
* AH
* BH
* CS
* CU
* EQ
* ET
* FG
* GL
* GW
* HW
* NY
* QS

HR|

* 4587
* 5183
* 5384

HD|

* 102195 (Flegetonte)
* 106252
* 106315
* 106515
* 107148
* 109271
* 114783
* 125612
* 126614
* 130322 (Mönch)
* 133600

Other|

* Gliese 486 (Gar)
* Gliese 514
* HAT-P-26 (Guahayona)
* HAT-P-27
* HE 1219-0312
* K2-19
* K2-229
* PSR B1257+12 (Lich)
* Qatar-2
* Ross 128
* Ross 458
* SDSS J1229+1122
* ULAS J133553.45+113005.2
* WASP-16
* WASP-24
* WASP-37
* WASP-39 (Malmok)
* WASP-54
* WASP-55
* WD 1145+017
* Wolf 424
* Wolf 489

| Exoplanets|

* 38 Virginis b
* 61 Virginis b
* c
* 70 Virginis b
* Gliese 504 b
* Gliese 536 b
* HD 102195 b (Lete)
* HD 106252 b
* HD 107148 b
* HD 114783 b
* HD 125612 b
* c
* d
* HD 126614 Ab
* HD 130322 b (Eiger)
* HR 5183 b
* K2-137b
* K2-229b
* KELT-21b
* PSR B1257+12 A (Draugr)
* B (Poltergeist)
* C (Phobetor)
* Ross 128 b
* WASP-16b
* WASP-24b
* WASP-39b (Bocaprins)
* WASP-85 Ab
* WASP-107b
* WD 1145+017 b

|

| Star clusters|

* HVGC-1
* Koposov 1
* NGC 5634

|

| Nebulae|

* Abell 36

|

Galaxies|

| Messier|

* 49
* 58
* 59
* 60
* 61
* 84
* 86
* 87
* 89
* 90
* 104 (Sombrero Galaxy)

|

NGC|

* 3776
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* 3818
* 3833
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* 3848
* 3852
* 3914
* 3915
* 4030
* 4123
* 4129
* 4178
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* 4380
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* 4451
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* 4458
* 4461
* 4464
* 4466
* 4467
* 4469
* 4470
* 4476
* 4478
* 4482
* 4483
* 4487
* 4488
* 4491
* 4492
* 4496
* 4497
* 4503
* 4504
* 4517
* 4519
* 4522
* 4526
* 4527
* 4528
* 4531
* 4535
* 4536
* 4544
* 4546
* 4550
* 4551
* 4564
* 4567
* 4568
* 4570
* 4578
* 4580
* 4586
* 4593
* 4596
* 4598
* 4606
* 4607
* 4608
* 4612
* 4620
* 4623
* 4630
* 4632
* 4636
* 4637
* 4638
* 4639
* 4643
* 4647 (Arp 116)
* 4654
* 4658
* 4660
* 4664
* 4666
* 4674
* 4680
* 4691
* 4694
* 4697
* 4698
* 4699
* 4700
* 4701
* 4713
* 4731
* 4733
* 4734
* 4746
* 4753
* 4754
* 4762
* 4772
* 4775
* 4777
* 4780
* 4781
* 4790
* 4818
* 4825
* 4845
* 4856
* 4866
* 4900
* 4902
* 4918
* 4939
* 4941
* 4958
* 4984
* 4991
* 4995
* 4999
* 5006
* 5010
* 5018
* 5030
* 5050
* 5054
* 5068
* 5084
* 5087
* 5170
* 5174
* 5177
* 5235
* 5247
* 5252
* 5300
* 5331
* 5334
* 5335
* 5343
* 5363
* 5364
* 5384
* 5468
* 5470
* 5501
* 5506
* 5555
* 5566
* 5575
* 5584
* 5619
* 5668
* 5679
* 5701
* 5705
* 5713
* 5719
* 5746
* 5750
* 5765
* 5774
* 5775
* 5806
* 5838
* 5846
* 5850

Other|

* A1689-zD1
* Abell 1835 IR1916
* Arp 240 (NGC 5257 and NGC 5258)
* Arp 271 (NGC 5426 and NGC 5427)
* 3C 273
* 3C 279
* 4C 03.24
* Eyes Galaxies
* GR 8
* Hedgehog
* IC 1011
* IC 1101
* IC 3078
* IC 3430
* IC 3583
* IRAS 12112+0305
* LEDA 1245565
* M60-UCD1
* PKS 1148-001
* PKS 1302–102
* PKS 1335−127
* PKS 1402+044

| Galaxy clusters|

* Abell 1689
* Abell 1835
* Abell 2029
* Abell 2147
* IRAS 13218+0552
* RX J1347.5−1145
* Virgo Cluster

|

| Astronomical events|

* North Polar Spur
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* U1.11

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template
*[Primary]: Primary member of a system is the brightest one (and, in most cases, also the most massive one).