1181 Lilith

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1181 Lilith
Discovery [1]
Discovered byB. Jekhovsky
Discovery siteAlgiers Obs.
Discovery date11 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 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc85.90 yr (31,375 days)
Aphelion3.1867 AU
Perihelion2.1393 AU
2.6630 AU
4.35 yr (1,587 days)
0° 13m 36.48s / day
Physical characteristics
22.133±0.254 km[5]
24.18 km (calculated)[3]
15.04±0.01 h[6]
0.10 (assumed)[3]
SMASS = X[1] · P[5] · X[3]
11.2[1][3] · 11.5[5] · 11.56±0.52[7]

1181 Lilith, provisional designation 1927 CQ, is a metallic 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, and named after French composer Lili Boulanger.[2][8]

Classification and orbit[edit]

The asteroid orbits the Sun in the middle main-belt 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]

First identified as A914 BA at Simeiz Observatory in 1914, Lilith's observation arc begins 7 years after its official discovery observation, with its first used observation made at Konkoly Observatory in 1934.[8]

Physical characteristics[edit]

Lilith is a X-type asteroid in the SMASS taxonomy. It has also been classified as a P-type asteroid by NASA's space-based Wide-field Infrared Survey Explorer.[5]

Rotation period[edit]

In February 2014, a rotational lightcurve of Lilith 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).[6]

Diameter and albedo[edit]

According to NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Lilith measures between 20.5 and 22.1 kilometers in diameter, and its surface has an albedo between 0.09 and 0.10,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10, and calculates a diameter of 24.2 kilometers with an absolute magnitude of 11.2.[1]


This 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)" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 9 December 2016.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1181) Lilith. Springer Berlin Heidelberg. p. 99. ISBN 978-3-540-00238-3. Retrieved 25 May 2016.
  3. ^ a b c d e "LCDB Data for (1181) Lilith". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016.
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 9 December 2016.
  5. ^ 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 25 May 2016.
  6. ^ 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 25 May 2016.
  7. ^ 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 25 May 2016.
  8. ^ a b "1181 Lilith (1927 CQ)". Minor Planet Center. Retrieved 25 May 2016.

External links[edit]