1924 Horus

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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
MPC designation (1924) Horus
Named after
Horus (Egyptian mythology)[2]
4023 P-L · 1951 BD
1969 BA
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
2.3398 AU
Eccentricity 0.1311
3.58 yr (1,307 days)
0° 16m 31.44s / day
Inclination 2.7294°
Physical characteristics
Dimensions 12.3 km
0.0888 ± 0.011

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.[2][6]

Orbit and classification[edit]

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.[6]

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.[7]

Physical characteristics[edit]

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.[3] The body has a rotation period of 6.183 hours.[4][5]


This minor planet was named after Horus, the falcon-headed king of the sky and the stars, and son of the Egyptian god Osiris.[2] The official naming citation was published by the Minor Planet Center on 1 November 1979 (M.P.C. 5013).[8]


  1. ^ a b "JPL Small-Body Database Browser: 1924 Horus (4023 P-L)" (2017-06-04 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1924) Horus. Springer Berlin Heidelberg. p. 154. ISBN 978-3-540-00238-3. Retrieved 14 June 2017. 
  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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 14 June 2017. 
  4. ^ a b "LCDB Data for (1924) Horus". Asteroid Lightcurve Database (LCDB). Retrieved 14 June 2017. 
  5. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1924) Horus". Geneva Observatory. Retrieved 14 June 2017. 
  6. ^ a b "1924 Horus (4023 P-L)". Minor Planet Center. Retrieved 14 June 2017. 
  7. ^ "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 14 June 2017. 
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 June 2017. 

External links[edit]