1181 Lilith

1181 Lilith, provisional designation 1927 CQ, is a metallic asteroid from the middle region of the asteroid belt, approximately 23 kilometers in diameter.

1181 Lilith
Discovery [1]
Discovered byB. Jekhovsky
Discovery siteAlgiers Obs.
Discovery date11 February 1927
Designations
(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
Eccentricity0.1967
4.35 yr (1,587 days)
307.30°
0° 13m 36.48s / day
Inclination5.6027°
260.71°
156.15°
Physical characteristics
Dimensions20.492±0.276[4]
22.133±0.254 km[5]
24.18 km (calculated)[3]
15.04±0.01 h[6]
0.0910±0.0157[5]
0.10 (assumed)[3]
0.106±0.011[4]
SMASS = X [1] · P [5] · X [3]
11.2[1][3] · 11.5[5] · 11.56±0.52[7]

    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

    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

    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

    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

    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]

    Naming

    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]

    References
    1. "JPL Small-Body Database Browser: 1181 Lilith (1927 CQ)" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 9 December 2016.
    2. Schmadel, Lutz D. (2007). "(1181) Lilith". Dictionary of Minor Planet Names – (1181) Lilith. Springer Berlin Heidelberg. p. 99. doi:10.1007/978-3-540-29925-7_1182. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1181) Lilith". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016.
    4. 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. 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. 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. "1181 Lilith (1927 CQ)". Minor Planet Center. Retrieved 25 May 2016.

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