1181 Lilith

1181 Lilith (prov. designation: 1927 CQ) is a metallic asteroid from the middle region of the asteroid belt, approximately 23 kilometers (14 miles) 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][1]

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]
background [4][5][6]
Orbital characteristics [7]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc89.50 yr (32,689 d)
Aphelion3.1851 AU
Perihelion2.1457 AU
2.6654 AU
Eccentricity0.1950
4.35 yr (1,589 d)
219.56°
0° 13m 35.4s / day
Inclination5.6012°
260.70°
156.05°
Physical characteristics
Mean diameter
20.492±0.276 km[8][9]
15.04±0.01 h[10]
0.106±0.011[9]
SMASS = X [7][5]
11.3[1][7]

    Classification and orbit

    Lilith is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5][6] It orbits the Sun in the middle asteroid 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.[7] First observed 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.[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]

    Physical characteristics

    Lilith is an X-type asteroid in the Bus–Binzel SMASS taxonomy. It has also been classified as a P-type asteroid by NASA's space-based Wide-field Infrared Survey Explorer (WISE).[3]

    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).[10]

    Diameter and albedo

    According to NASA's WISE telescope with its subsequent NEOWISE mission, Lilith measures (20.492±0.276) kilometers in diameter and its surface has an albedo of (0.106±0.011),[8][9] 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.[7] The WISE team also published an alternative mean-diameter (22.133±0.254 km) and an albedo of (0.116±0.022).[5]

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    References
    1. "1181 Lilith (1927 CQ)". Minor Planet Center. Retrieved 21 July 2020.
    2. Schmadel, Lutz D. (2007). "(1181) Lilith". Dictionary of Minor Planet Names. 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. "Asteroid 1181 Lilith – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 July 2020.
    5. "Asteroid 1181 Lilith – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 21 July 2020.
    6. Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 21 July 2020. (PDS main page)
    7. "JPL Small-Body Database Browser: 1181 Lilith (1927 CQ)" (2020-06-17 last obs.). Jet Propulsion Laboratory. Retrieved 21 July 2020.
    8. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode:2016PDSS..247.....M. Retrieved 21 July 2020.
    9. 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.
    10. 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.
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