| Discovery[1] | |
|---|---|
| Discovered by | B. Jekhovsky |
| Discovery site | Algiers Obs. |
| Discovery date | 11 February 1927 |
| Designations | |
| (1181) Lilith | |
Named after | Lili Boulanger (Frenchcomposer)[2] |
| 1927 CQ · 1925 QF 1943 WC · 1953 CA 1964 PG · A914 BA | |
| main-belt · (middle)[3] background[4][5][6] | |
| Symbol | .svg) (astrological) |
| Orbital characteristics[7] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.50yr (32,689 d) |
| Aphelion | 3.1851AU |
| Perihelion | 2.1457 AU |
| 2.6654 AU | |
| Eccentricity | 0.1950 |
| 4.35 yr (1,589 d) | |
| 219.56° | |
| 0° 13m 35.4s / day | |
| Inclination | 5.6012° |
| 260.70° | |
| 156.05° | |
| Physical characteristics | |
| 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] | |
1181 Lilith (prov. designation:1927 CQ) is a metallicasteroid from the middle region of theasteroid belt, approximately 23 kilometers (14 miles) in diameter. It was discovered on 11 February 1927, by Russian–French astronomerBenjamin Jekhowsky atAlgiers Observatory in Algeria, Northern Africa, and named after French composerLili Boulanger.[2][1]
Lilith is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5][6] It orbits the Sun in themiddle asteroid belt at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,587 days). Its orbit has aneccentricity of 0.20 and aninclination of 6° with respect to theecliptic.[7] First observed asA914 BA atSimeiz Observatory in 1914,Lilith'sobservation arc begins 7 years after its official discovery observation, with its first used observation made atKonkoly Observatory in 1934.[1]
Thisminor planet was named by the discoverer for French composerMarie-Juliette Olga Lili Boulanger (1893–1918), younger sister of the noted conductor and composer,Nadia Boulanger. Her byname "Lili" originates fromLilith, Adam's first wife in Jewish mythology (H 110).[2]
Lilith is anX-type asteroid in the Bus–BinzelSMASS taxonomy. It has also been classified as aP-type asteroid by NASA's space-basedWide-field Infrared Survey Explorer (WISE).[3]
In February 2014, a rotationallightcurve ofLilith was obtained by Italian astronomer Andrea Ferrero at the Bigmuskie Observatory (B88) in Mombercelli, Italy. The photometric observations rendered aperiod of15.04±0.01 hours with a brightness amplitude of 0.11 inmagnitude (U=2).[10]
According to NASA's WISE telescope with its subsequent NEOWISE mission,Lilith measures (20.492±0.276) kilometers in diameter and its surface has analbedo of (0.106±0.011),[8][9] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.10, and calculates a diameter of 24.2 kilometers with anabsolute magnitude of 11.2.[7] The WISE team also published an alternativemean diameter (22.133±0.254 km) and an albedo of (0.116±0.022).[5]
