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1181 Lilith

Metallic main-belt asteroid

1181 Lilith
Discovery^[1]
Discovered by	B. Jekhovsky
Discovery site	Algiers Obs.
Discovery date	11 February 1927
Designations
MPC designation	(1181) Lilith
Named after	Lili Boulanger (French composer)^[2]
Alternative designations	1927 CQ · 1925 QF 1943 WC · 1953 CA 1964 PG · A914 BA
Minor planet category	main-belt · (middle)^[3] background^[4]^[5]^[6]
Symbol	(astrological)
Orbital characteristics^[7]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc	89.50 yr (32,689 d)
Aphelion	3.1851 AU
Perihelion	2.1457 AU
Semi-major axis	2.6654 AU
Eccentricity	0.1950
Orbital period (sidereal)	4.35 yr (1,589 d)
Mean anomaly	219.56°
Mean motion	0° 13^m 35.4^s / day
Inclination	5.6012°
Longitude of ascending node	260.70°
Argument of perihelion	156.05°
Physical characteristics
Mean diameter	20.492±0.276 km^[8]^[9]
Synodic rotation period	15.04±0.01 h^[10]
Geometric albedo	0.106±0.011^[9]
Spectral type	SMASS = X^[7]^[5]
Absolute magnitude (H)	11.3^[1]^[7]

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]

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 Jekhowsky for Marie Juliette Boulanger (1893–1918), nicknamed Lili. She was the younger sister of Nadia Boulanger and daughter of Ernest Boulanger.^[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]

References

1 2 3 4 "1181 Lilith (1927 CQ)". Minor Planet Center. Retrieved 21 July 2020.
1 2 3 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.
1 2 "MinorPlanet.info: One Asteroid Information". Asteroid Lightcurve Database (LCDB). Search using Number = "1181"
1 2 "Asteroid 1181 Lilith – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 July 2020.
1 2 3 4 "Asteroid 1181 Lilith – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 21 July 2020.
1 2 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)
1 2 3 4 5 "JPL Small-Body Database Browser: 1181 Lilith (1927 CQ)" (2020-06-17 last obs.). Jet Propulsion Laboratory. Retrieved 21 July 2020.
1 2 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.
1 2 3 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.
1 2 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.

External links

Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Dictionary of Minor Planet Names, Google books
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
1181 Lilith at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1181 Lilith at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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