| Discovery[1] | |
|---|---|
| Discovered by | L. Zhuravleva |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 23 December 1979 |
| Designations | |
| (3724) Annenskij | |
Named after | Innokenty Annensky[1] (Russian poet) |
| 1979 YN8 · 1933 XB 1955 QQ · 1965 YM 1969 RF2 · 1974 VM2 1980 AE · 1985 DF1 | |
| main-belt[1][2] · (middle) Gefion[3] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.28yr (30,783 d) |
| Aphelion | 3.2198AU |
| Perihelion | 2.3123 AU |
| 2.7660 AU | |
| Eccentricity | 0.1640 |
| 4.60 yr (1,680 d) | |
| 176.15° | |
| 0° 12m 51.48s / day | |
| Inclination | 7.7351° |
| 269.19° | |
| 117.85° | |
| Physical characteristics | |
| 12.09±2.86 km[4] 13.55±0.37 km[5] 13.74±0.47 km[6] 14.15±1.3 km[7] 15.229±0.114 km[8] 15.386±0.248 km[9] | |
| 3.969±0.001 h[10] 3.974±0.002 h[10] | |
| 0.1744±0.0145[8] 0.19±0.09[4] 0.2021(derived)[11] 0.2022±0.043[7] 0.227±0.013[5] 0.235±0.028[6] | |
| S(family-based)[12] | |
| 11.47±0.33[13] 11.50[6] 11.60[2][5][7][8][11] 12.00[4] | |
3724 Annenskij, provisional designation1979 YN8, is a stony Gefionianasteroid from the central regions of theasteroid belt, approximately 14 kilometers (9 miles) in diameter. It was discovered on 23 December 1979, by Soviet astronomerLyudmila Zhuravleva at theCrimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[1] TheS-type asteroid has a rotation period of 3.97 hours.[11] It was named for Russian poetInnokenty Annensky.[1]
Annenskij is a member of theGefion family (516),[3] a largeasteroid family in the intermediate asteroid belt, named after1272 Gefion.[12] It is also known as the Ceres or Minerva family.
It orbits the Sun in thecentral main-belt at a distance of 2.3–3.2 AU once every 4 years and 7 months (1,680 days;semi-major axis of 2.77 AU). Its orbit has aneccentricity of 0.16 and aninclination of 8° with respect to theecliptic.[2] The body'sobservation arc begins with its first observation as1933 XB atHeidelberg Observatory in December 1933, or 46 years prior to its official discovery observation at Nauchnij.[1]
Based on its classification into the Gefion family,Annenskij is a stonyS-type asteroid.[12]: 23
Two rotationallightcurves ofAnnenskij were obtained fromphotometric observations by Italian and French amateur astronomersSilvano Casulli,Laurent Bernasconi andCyril Cavadore . Lightcurve analysis gave arotation period of 3.969 and 3.974 hours with a brightness amplitude of 0.30 and 0.28magnitude (U=3-/3).[10]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Annenskij measures between 12.09 and 15.386 kilometers in diameter and its surface has analbedo between 0.1744 and 0.235.[4][5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.2021 and a diameter of 14.15 kilometers based on anabsolute magnitude of 11.6.[11]
Thisminor planet was named after Russian poet and writerInnokenty Annensky (1855–1909).[1] The official naming citation was published by theMinor Planet Center on 4 June 1993 (M.P.C. 22246) with a correction on Annensky's date of death published on 4 February 1996 (M.P.C. 26439).[14]
