# 104 Herculis

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**104 Herculis** is a solitary[1] [variable star](/source/Variable_star)[2] located around 560[3] [light years](/source/Light_year) away from the Sun in the northern [constellation](/source/Constellation) of [Hercules](/source/Hercules_(constellation)).[4] It has the [variable star designation](/source/Variable_star_designation) **V669 Herculis** and the [Bayer designation](/source/Bayer_designation) **A Herculis**, while *104 Herculis* is the [Flamsteed designation](/source/Flamsteed_designation). This object is visible to the [naked eye](/source/Naked_eye) as a dim, red-hued point of light with a baseline [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.96.[5] It is moving closer to the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of −1.2 km/s.[5]

The [variability](/source/Variable_star) of the brightness of 104 Herculis was announced by [Joel Stebbins](/source/Joel_Stebbins) and [Charles Morse Huffer](/source/Charles_Morse_Huffer) in 1928, based on observations made at [Washburn Observatory](/source/Washburn_Observatory).[6] It was given its variable star designation in 1977.[7]

This is an aging [red giant](/source/Red_giant) star on the [asymptotic giant branch](/source/Asymptotic_giant_branch)[8] with a [stellar classification](/source/Stellar_classification) of M3 III.[9] It is a [semiregular variable](/source/Semiregular_variable_star)[10] with an [amplitude](/source/Amplitude) of 0.14 in the [B-band](/source/UBV_photometric_system)[11] and pulsation periods of 22.9 and 24.0 days.[12] Having exhausted the hydrogen at its [core](/source/Stellar_core), the star has expanded to 86 times the [Sun's radius](/source/Sun's_radius).[3] It is radiating 1,202 times the [Sun's luminosity](/source/Sun's_luminosity)[3] from its swollen [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 3,535 K.[13]

## References

1. Eggleton, P. P. & Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*. **389** (2): 869–879, [arXiv:0806.2878](https://arxiv.org/abs/0806.2878). [Bibcode:2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E). [doi:10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111/j.1365-2966.2008.13596.x). [S2CID 14878976](https://api.semanticscholar.org/CorpusID:14878976)

1. Adelman, Saul J. & Harrell, William L. (2006), "BVRI Photometry of nz Gem, HD 73017, HD 77247, RT Vir and 104 Her", *Baltic Astronomy*. **15**: 363–381, [Bibcode:2006BaltA..15..363A](https://ui.adsabs.harvard.edu/abs/2006BaltA..15..363A)

1. "104 Her". Retrieved 2019-06-17.

1. Anderson, E. & Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*. **38** (5): 331, [arXiv:1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode:2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi:10.1134/S1063773712050015](https://doi.org/10.1134/S1063773712050015). [S2CID 119257644](https://api.semanticscholar.org/CorpusID:119257644)

1. Stebbins, Joel & Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". *Publications of the Washburn Observatory*. **15**: 137–174. [Bibcode:1928PWasO..15..137S](https://ui.adsabs.harvard.edu/abs/1928PWasO..15..137S)

1. Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). ["62nd Name-List of Variable Stars"](https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf). *Information Bulletin on Variable Stars*. **1248**: 1–25. [Bibcode:1977IBVS.1248....1K](https://ui.adsabs.harvard.edu/abs/1977IBVS.1248....1K). Retrieved 8 December 2024.

1. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", *Astronomical Journal*. **104** (1): 275–313, [Bibcode:1992AJ....104..275E](https://ui.adsabs.harvard.edu/abs/1992AJ....104..275E). [doi:10.1086/116239](https://doi.org/10.1086/116239)

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, [Bibcode:1989ApJS...71..245K](https://ui.adsabs.harvard.edu/abs/1989ApJS...71..245K). [doi:10.1086/191373](https://doi.org/10.1086/191373). [S2CID 123149047](https://api.semanticscholar.org/CorpusID:123149047)

1. Glass, I. S. & Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", *Monthly Notices of the Royal Astronomical Society*. **378** (4): 1543–1549, [arXiv:0704.3150](https://arxiv.org/abs/0704.3150). [Bibcode:2007MNRAS.378.1543G](https://ui.adsabs.harvard.edu/abs/2007MNRAS.378.1543G). [doi:10.1111/j.1365-2966.2007.11903.x](https://doi.org/10.1111/j.1365-2966.2007.11903.x). [S2CID 14332208](https://api.semanticscholar.org/CorpusID:14332208)

1. Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", *Astronomy Reports*. **61** (1): 80–88, 5.1, [Bibcode:2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S). [doi:10.1134/S1063772917010085](https://doi.org/10.1134/S1063772917010085). [S2CID 125853869](https://api.semanticscholar.org/CorpusID:125853869)

1. Tabur, V. et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*. **400** (4): 1945–1961, [arXiv:0908.3228](https://arxiv.org/abs/0908.3228). [Bibcode:2009MNRAS.400.1945T](https://ui.adsabs.harvard.edu/abs/2009MNRAS.400.1945T). [doi:10.1111/j.1365-2966.2009.15588.x](https://doi.org/10.1111/j.1365-2966.2009.15588.x). [S2CID 15358380](https://api.semanticscholar.org/CorpusID:15358380)

1. Prugniel, Ph. et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", *Astronomy & Astrophysics*. **531**: A165, [arXiv:1104.4952](https://arxiv.org/abs/1104.4952). [Bibcode:2011A&A...531A.165P](https://ui.adsabs.harvard.edu/abs/2011A%26A...531A.165P). [doi:10.1051/0004-6361/201116769](https://doi.org/10.1051/0004-6361/201116769). [S2CID 54940439](https://api.semanticscholar.org/CorpusID:54940439)

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Adapted from the Wikipedia article [104 Herculis](https://en.wikipedia.org/wiki/104_Herculis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/104_Herculis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.