.png) Lightcurve-based 3D-model ofPhryne | |
| Discovery[1] | |
|---|---|
| Discovered by | E. Delporte |
| Discovery site | Uccle Obs. |
| Discovery date | 15 September 1933 |
| Designations | |
| (1291) Phryne | |
| Pronunciation | /ˈfraɪniː/ |
Named after | ΦρύνηPhrȳnē[2] (ancient Greek courtesan) |
| 1933 RA · 1931 DX 1932 KJ · 1953 JS A907 TA · A922 NA | |
| main-belt · (outer) Eos[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.08 yr (39,843 days) |
| Aphelion | 3.2977AU |
| Perihelion | 2.7292 AU |
| 3.0134 AU | |
| Eccentricity | 0.0943 |
| 5.23yr (1,911 days) | |
| 29.198° | |
| 0° 11m 18.24s / day | |
| Inclination | 9.1061° |
| 215.38° | |
| 118.83° | |
| Physical characteristics | |
| Dimensions | 24.954±0.275 km[5] 26.52 km(derived)[3] 26.78±2.2 km[6] 27.418±0.149 km[7] 31.13±0.52 km[8] |
| 5.55h[9] 5.58410±0.00007 h[10] 5.584139±0.000001 h[11] 5.58414±0.00005 h[12] | |
| 0.127±0.019[7] 0.1355(derived)[3] 0.141±0.005[8] 0.1537±0.0198[5] 0.1818±0.033[6] | |
| S[3] B–V = 0.835[1] U–B = 0.395[1] | |
| 10.3[1] · 10.33[6][8] · 10.67[3][5][9] | |
1291 Phryne, provisional designation1933 RA, is an Eoanasteroid from the outer regions of theasteroid belt, approximately 27 kilometers in diameter. It was discovered on 15 September 1933, by Belgian astronomerEugène Delporte at theRoyal Observatory of Belgium in Uccle.[13] The asteroid was named after the ancient Greek courtesanPhryne.
Phryne is a member theEos family (606),[4] the largestasteroid family in theouter main belt consisting of nearly 10,000 asteroids.[14]: 23 It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,911 days). Its orbit has aneccentricity of 0.09 and aninclination of 9° with respect to theecliptic.[1] The body'sobservation arc begins with its first identification asA907 TA atHeidelberg Observatory in October 1907.[13]
Phryne is an assumed stonyS-type asteroid,[3] while the Eon family's overallspectral type is that of aK-type.[14]: 23
In May 1984, a rotationallightcurve ofPhryne was obtained by astronomerRichard Binzel. Lightcurve analysis gave a well-definedrotation period of 5.55 hours with a brightness variation of 0.86magnitude (U=3).[9] In August 2006, from photometric observations by French amateur astronomerPierre Antonini gave a period of 5.58410 hours and an amplitude of 0.38 magnitude (U=3)[10]
In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a period 5.58414 hours, as well as two spin axis of (106.0°, 35.0°) and (277.0°, 59.0°) inecliptic coordinates (λ, β).[12] In 2017, a new study of the same international collaboration about the rotational states of Eoan asteroids gave a revised shape model with a period of 5.584139 hours and two spin axis of (109.0°, 33.0°) and (281.0°, 56.0°).[11]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Phryne measures between 24.954 and 31.13 kilometers in diameter and its surface has analbedo between 0.127 and 0.1818.[5][6][7][8]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1355 and a diameter of 26.52 kilometers based on anabsolute magnitude of 10.67.[3]
Thisminor planet was named afterPhryne, the beautiful ancient Greek courtesan (hetaira) of the 4th century B.C. Supposedly, she was the model for the statueAphrodite of Knidos by ancient Greek sculptorPraxiteles(see asteroid5983), who was also her lover. It was the first nude statue of a woman from ancient Greece. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 118).[2]
