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1924 Horus
Discovery^[1]
Discovered by	C. J. van Houten I. van Houten G. T. Gehrels
Discovery site	Palomar Obs.
Discovery date	24 September 1960
Designations
MPC designation	(1924) Horus
Pronunciation	/ˈhɔːrəs/^[2]
Named after	Horus (Egyptian mythology)^[3]
Alternative designations	4023 P-L · 1951 BD 1969 BA
Minor planet category	main-belt
Orbital characteristics^[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	56.69 yr (20,707 days)
Aphelion	2.6465 AU
Perihelion	2.0331 AU
Semi-major axis	2.3398 AU
Eccentricity	0.1311
Orbital period (sidereal)	3.58 yr (1,307 days)
Mean anomaly	203.62°
Mean motion	0° 16^m 31.44^s / day
Inclination	2.7294°
Longitude of ascending node	350.27°
Time of perihelion	2022-Oct-26
Argument of perihelion	152.36°
Physical characteristics
Dimensions	12.3 km 12.986±0.135^[4]
Synodic rotation period	6.183±0.006^[5]^[6]
Geometric albedo	0.070±0.004^[4] 0.0888 ± 0.011
Absolute magnitude (H)	13.5

1924 Horus, provisional designation 4023 P-L, is a dark asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. Discovered during the Palomar–Leiden survey in 1960, it was later named after Horus from Egyptian mythology.^[3]^[7]

Orbit and classification

Horus was discovered on 24 September 1960, by Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden, on photographic plates taken by Tom Gehrels at Palomar. On the same date, the trio of astronomers also discovered 1912 Anubis, 1923 Osiris and 5011 Ptah.^[7]

The survey designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroid discoveries.^[8]

Physical characteristics

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Horus measures 12.986 kilometers in diameter and its surface has an albedo of 0.070.^[4] The body has a rotation period of 6.183 hours.^[5]^[6]

Naming

This minor planet was named after Horus, the falcon-headed king of the sky and the stars, and son of the Egyptian god Osiris.^[3] The official naming citation was published by the Minor Planet Center on 1 November 1979 (M.P.C. 5013).^[9]

References

^ ^a ^b "JPL Small-Body Database Browser: 1924 Horus (4023 P-L)". Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 14 June 2017.
^ "Horus". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b ^c Schmadel, Lutz D. (2007). "(1924) Horus". Dictionary of Minor Planet Names – (1924) Horus. Springer Berlin Heidelberg. p. 154. doi:10.1007/978-3-540-29925-7_1925. ISBN 978-3-540-00238-3.
^ ^a ^b ^c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 14 June 2017.
^ ^a ^b "LCDB Data for (1924) Horus". Asteroid Lightcurve Database (LCDB). Retrieved 14 June 2017.
^ ^a ^b Behrend, Raoul. "Asteroids and comets rotation curves – (1924) Horus". Geneva Observatory. Retrieved 14 June 2017.
^ ^a ^b "1924 Horus (4023 P-L)". Minor Planet Center. Retrieved 14 June 2017.
^ "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 14 June 2017.
^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 June 2017.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 21 July 2011 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
1924 Horus at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1924 Horus at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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