1365 Henyey

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1365 Henyey
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date9 September 1928
MPC designation(1365) Henyey
Named after
Louis Henyey
(American astronomer)[2]
1928 RK · 1932 WL
1941 ME · 1973 YG4
1984 BA · A907 GK
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc109.96 yr (40,164 days)
Aphelion2.5248 AU
Perihelion1.9723 AU
2.2486 AU
3.37 yr (1,232 days)
0° 17m 32.28s / day
Physical characteristics
Dimensions10.31±1.91 km[4]
10.958±0.369 km[5]
11.31 km (calculated)[3]
18.986±0.002 h[6]
32.2±0.2 h[7]
0.24 (assumed)[3]
11.80[5] · 11.9[1][3] · 12.01±0.26[8] · 12.10[4]

1365 Henyey, provisional designation 1928 RK, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered by German astronomer Max Wolf at Heidelberg Observatory in southern Germany on 9 September 1928, and named for American astronomer Louis Henyey.[2][9]

Orbit and classification[edit]

Henyey is a member of the Flora family, a large population of stony S-type asteroids in the inner main-belt. It orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,232 days). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic.[1] It was first Identified as A907 GK at Heidelberg in 1907. The body's observation arc begins with its official discovery observation in 1928.[9]

Physical characteristics[edit]

Rotation period[edit]

In August 2012, a first rotational lightcurve of Henyey was obtained from photometric observations by Daniel Klinglesmith at Etscorn Campus Observatory (719) in New Mexico. It gave a rotation period of 18.986 hours with a brightness variation of 0.23 magnitude (U=2).[6] In November 2016, a divergent period solution of 32.2 hours with a change in brightness of 0.32 magnitude was found by French amateur astronomer René Roy (U=2).[7]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Henyey measures 10.31 and 10.96 kilometers in diameter and its surface has an albedo of 0.26 and 0.28. respectively.[4][5] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the family – and calculates a diameter of 11.31 kilometers with an absolute magnitude of 11.9.[3]


Based on a suggestion by William Westbrooke, this minor planet was named after American astronomer Louis Henyey (1910–1970), known for his contributions in the field of stellar structure and stellar evolution. The lunar crater Henyey is also named in his honour.[2] The official naming citation was published by the Minor Planet Center on 20 February 1971 (M.P.C. 3143).[10]

Further reading[edit]

  • Reddy, V.; Emery, J. P.; Gaffey, M. J.; Bottke, W. F.; Cramer, A.; Kelley, M. S. (January 2009). "Composition of 298 Baptistina: Implications for the K/T impactor link". Meteoritics & Planetary Science. 44 (12): 1917–1927. Bibcode:2009M&PS...44.1917R. doi:10.1111/j.1945-5100.2009.tb02001.x. Retrieved 22 November 2015.
  • Reddy, Vishnu; Carvano, Jorge M.; Lazzaro, Daniela; Michtchenko, Tatiana A.; Gaffey, Michael J.; Kelley, Michael S.; et al. (November 2011). "Mineralogical characterization of Baptistina Asteroid Family: Implications for K/T impactor source". Icarus. 216 (1): 184–197. arXiv:1110.3414. Bibcode:2011Icar..216..184R. doi:10.1016/j.icarus.2011.08.027. Retrieved 22 November 2015.


  1. ^ a b c d "JPL Small-Body Database Browser: 1365 Henyey (1928 RK)" (2017-03-21 last obs.). Jet Propulsion Laboratory. Retrieved 25 July 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1365) Henyey". Dictionary of Minor Planet Names – (1365) Henyey. Springer Berlin Heidelberg. p. 111. doi:10.1007/978-3-540-29925-7_1366. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1365) Henyey". Asteroid Lightcurve Database (LCDB). Retrieved 12 January 2017.
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 12 January 2017.
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 12 January 2017.
  6. ^ a b Klinglesmith, Daniel A., III; Hanowell, Jesse; Risley, Ethan; Turk, Janek; Vargas, Angelica; Warren, Curtis Alan (April 2013). "Asteroid Synodic Periods from Etscorn Campus Observatory". The Minor Planet Bulletin. 40 (2): 65–67. Bibcode:2013MPBu...40...65K. ISSN 1052-8091. Retrieved 12 January 2017.
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1365) Henyey". Geneva Observatory. Retrieved 12 January 2017.
  8. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 12 January 2017.
  9. ^ a b "1365 Henyey (1928 RK)". Minor Planet Center. Retrieved 12 January 2017.
  10. ^ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External links[edit]