| Discovery[1] | |
|---|---|
| Discovered by | T. Smirnova |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 13 January 1975 |
| Designations | |
| (7369) Gavrilin | |
| Pronunciation | /ɡəvˈriːlɪn/ |
Named after | Valery Gavrilin (Гаври́лин)[1] (Russian composer) |
| 1975 AN · 1975 AX 1985 YU · 1986 AG | |
| Mars-crosser[1][2] Phocaea[3] · binary[4] | |
| Orbital characteristics[2] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 43.79yr (15,995 d) |
| Aphelion | 3.1269AU |
| Perihelion | 1.6119 AU |
| 2.3694 AU | |
| Eccentricity | 0.3197 |
| 3.65 yr (1,332 d) | |
| 86.439° | |
| 0° 16m 12.72s / day | |
| Inclination | 21.817° |
| 278.24° | |
| 113.26° | |
| Knownsatellites | 1(D: 2.41 km; P: 49.2 h)[4][a] |
| Earth MOID | 0.7338 AU (286LD) |
| Physical characteristics | |
| 4.91±0.88 km[5] 5.49±1.41 km[6][7] 5.51±0.55 km[8] | |
| 49.12 h[9][a][b] | |
| 0.27[5] 0.28[6][7] 0.305[8] | |
| S(assumed)[10] | |
| 13.10[6][7] 13.12[9] 13.20[1][2][8] 13.53[5] | |
7369 Gavrilin, provisional designation1975 AN, is a stony Phocaeanasteroid, sizableMars-crosser, andbinary system on an eccentric orbit from the inner regions of theasteroid belt, approximately 5.5 kilometers (3.4 miles) in diameter. It was discovered on 13 January 1975, by Russian astronomerTamara Smirnova at theCrimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[1] The assumedS-type asteroid has a longrotation period of 49.1 hours.[10] It was named after Russian composerValery Gavrilin.[1] The discovery of its 2.4-kilometer sizedminor-planet moon was announced in October 2008.[4]
Gavrilin is both a member of the main belt'sPhocaea family (701) and a member of theMars-crossing asteroids, a dynamically unstablegroup between themain belt and thenear-Earth populations, crossing the orbit ofMars at 1.66 AU.[1][3]
It orbits the Sun in theinner asteroid belt at a distance of 1.6–3.1 AU once every 3 years and 8 months (1,332 days;semi-major axis of 2.37 AU). Its orbit has aneccentricity of 0.32 and aninclination of 22° with respect to theecliptic.[2] The body'sobservation arc begins with its first observation as1975 AN at thePurple Mountain Observatory in January 1975, eleven days prior to its official discovery observation,1975 AX byTamara Smirnova at Nauchnyj.[1]
Thisminor planet was numbered on 23 January 1997 (M.P.C. 28818).[11] It was named after the awarded Russian composerValery Gavrilin (1939–1999). The asteroid's name was suggested by the Union of Concert Workers of Russia, and its officialnaming citation was published by theMinor Planet Center on 24 January 2000 (M.P.C. 38196).[11]
Gavrilin is an assumed, stonyS-type asteroid,[10] the most commonspectral type in the inner asteroid belt. The assumption also agrees with the overall spectral type for the Phocaea family.[12]
In January 2008, rotationallightcurves ofGavrilin were obtained fromphotometric observations by the BINAST group includingDavid Higgins at the Hunters Hill Observatory (E14) in Australia andPetr Pravec at theOndřejov Observatory in the Czech Republic. Lightcurve analysis gave arotation period of 49.12 hours with a brightness amplitude of 0.25magnitude (U=3/3).[9][a][b]The photometric observation also revealed thatGavrilin is a synchronousbinary asteroid with aminor-planet moon in its orbit. The discovery was announced in October 2008. The satellite measures approximately 2.41 kilometers in diameter (a secondary-to-primary diameter-ratio of at least 0.32) and has anorbital period identical to that of the primary's rotation, 49.12 hours.[4][10][a]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer (WISE),Gavrilin measures 4.91 and 5.49 kilometers in diameter and its surface has analbedo of 0.27 and 0.28, respectively.[5][6][7] A 2017-WISE-study dedicated to Mars-crossing asteroids determined a diameter of 5.51 kilometers despite a higher albedo of 0.305.[8] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 5.74 kilometers based on anabsolute magnitude of 13.61, while the Johnston's Archive estimates a diameter of 7.54 kilometers for the primary.[4][10]
With a diameter of 5.5 kilometers,Gavrilin is one of the smallest "sizable" Mars-crossers (5–15 km). These include3581 Alvarez (13.7 km)1065 Amundsenia (9.8 km),1139 Atami (9.4 km),3737 Beckman (14.4 km),1474 Beira (15.5 km),5682 Beresford (7.3 km),1011 Laodamia (7.4 km),6170 Levasseur (5.7 km),1727 Mette (5.4 km),1131 Porzia (7.1 km),1235 Schorria (5.6 km),985 Rosina (8.2 km),1310 Villigera (15.2 km), and1468 Zomba (7 km), which are themselves smaller than the largest members of this dynamical group, namely,132 Aethra,323 Brucia (former Mars-crosser),1508 Kemi,2204 Lyyli and512 Taurinensis, all larger than 20 kilometers.
