1181 Lilith

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1181 Lilith
Discovery [1]
Discovered by B. Jekhovsky
Discovery site Algiers Obs.
Discovery date 11 February 1927
MPC designation 1181 Lilith
Named after
Lili Boulanger
(French composer)[2]
1927 CQ · 1925 QF
1943 WC · 1953 CA
1964 PG · A914 BA
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 85.40 yr (31,192 days)
Aphelion 3.1865 AU
Perihelion 2.1390 AU
2.6627 AU
Eccentricity 0.1967
4.35 yr (1,587 days)
0° 13m 36.48s / day
Inclination 5.6030°
Physical characteristics
Dimensions 22.133±0.254 km[4]
24.18 km (calculated)[3]
15.04±0.01 h[5]
0.10 (assumed)[3]
SMASS = X[1]
P[4] · X[3]

1181 Lilith, provisional designation 1927 CQ, is a dark asteroid from the middle region of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 11 February 1927, by Russian–French astronomer Benjamin Jekhowsky at Algiers Observatory in Algeria, Northern Africa.[7]

The X-type asteroid is also classified as a P-type by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer.[4] The asteroid orbits the Sun at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,587 days). Its orbit has an eccentricity of 0.20 and an inclination of 6° with respect to the ecliptic.[1] The first identification at Crimea-Simeis dates back to 1914 (A914 BA / 1914 BA), while the asteroid's first used observation was made at Konkoly Observatory in 1934, so its observation arc begins 7 years after its discovery.[7]

In February 2014, a rotational light-curve was obtained by Italian astronomer Andrea Ferrero at the Bigmuskie Observatory (B88) in Mombercelli, Italy. The photometric observations rendered a period of 15.04±0.01 hours with a brightness amplitude of 0.11 in magnitude (U=2).[5] According to preliminary results from NEOWISE, the asteroid has a low albedo of 0.09 and a diameter of 22.1 kilometers,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and calculates a diameter of 24.2 kilometers.[1]

The minor planet was named by the discoverer for French composer Marie-Juliette Olga Lili Boulanger (1893–1918), younger sister of the noted conductor and composer Nadia Boulanger. Her byname "Lili" originates from Lilith, Adam's first wife in Jewish mythology (H 110).[2]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1181 Lilith (1927 CQ)" (2016-05-12 last obs.). Jet Propulsion Laboratory. Retrieved May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1181) Lilith. Springer Berlin Heidelberg. p. 99. ISBN 978-3-540-00238-3. Retrieved May 2016. 
  3. ^ a b c d e "LCDB Data for (1181) Lilith". Asteroid Lightcurve Database (LCDB). Retrieved May 2016. 
  4. ^ a b c d e f Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved May 2016. 
  5. ^ a b Ferrero, Andrea (July 2014). "Period Determination of Six Main Belt Asteroids". The Minor Planet Bulletin 41 (3): 184–185. Bibcode:2014MPBu...41..184F. ISSN 1052-8091. Retrieved May 2016. 
  6. ^ 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 May 2016. 
  7. ^ a b "1181 Lilith (1927 CQ)". Minor Planet Center. Retrieved May 2016. 

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