_Eriphyla.png) Modelled shape ofEriphyla from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 22 October 1900 |
| Designations | |
| (462) Eriphyla | |
| Pronunciation | /ɛrɪˈfaɪlə/[2] |
Named after | Eriphyle (Greek mythology)[3] |
| A900 UJ · 1927 CP 1946 DB · 1948 OG 1951 EA3 · 1957 KB 1958 RR · 1959 WB A896 YA · A907 BB 1900 FQ | |
| Orbital characteristics[4] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 119.28yr (43,567 d) |
| Aphelion | 3.1252AU |
| Perihelion | 2.6181 AU |
| 2.8717 AU | |
| Eccentricity | 0.0883 |
| 4.87 yr (1,777 d) | |
| 224.51° | |
| 0° 12m 9s / day | |
| Inclination | 3.1927° |
| 105.28° | |
| 251.08° | |
| Physical characteristics | |
| 8.659±0.001 h[12] | |
| 9.4[1][4] | |
462 Eriphyla/ɛrɪˈfaɪlə/ (prov. designation:A900 UJor1900 FQ) is aKoronian asteroid from the outer regions of theasteroid belt. It was discovered by German astronomerMax Wolf at theHeidelberg-Königstuhl State Observatory on 22 October 1900.[1] The stonyS-type asteroid has arotation period of 8.7 hours and measures approximately 35 kilometers (22 miles) in diameter. It was named afterEriphyle, from Greek mythology.[3]
Eriphyla is a core member of theKoronis family (605), a very large outerasteroid family with nearly co-planar ecliptical orbits.[13][14][6][7] It orbits the Sun in theouter asteroid belt at a distance of 2.6–3.1 AU once every 4 years and 10 months (1,777 days;semi-major axis of 2.87 AU). Its orbit has aneccentricity of 0.09 and aninclination of 3° with respect to theecliptic.[4] The asteroid was first observed asA896 YA atNice Observatory on 31 December 1896. The body'sobservation arc begins at Heidelberg on 11 November 1900, three weeks after its official discovery observation.[1]
Thisminor planet was named from Greek mythology afterEriphyle, wife of Amphiaraus whom she persuaded to take part in a raiding venture which lead to the tragic war of theSeven against Thebes. Thenaming was also mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 50).[3]
In both theTholen andSMASS classification,Eriphyla is a common stonyS-type asteroid.[4]
In October 2002, a rotationallightcurve ofEriphyla was obtained fromphotometric observations by Stephen M. Slivan. Lightcurve analysis gave a well-definedrotation period of8.659±0.001 hours with a brightness variation of0.222±0.022magnitude (U=3).[12] Several more lightcurves were published since 1987.[15][16][17][18]
A modeled lightcurve using photometric data from theLowell Photometric Database and from theWide-field Infrared Survey Explorer (WISE) was published in 2018. It gave a concurring sidereal period of8.65890±0.00002 hours and includes twospin axes at (119.0°, 7.0°) and (301.0°, 5.0°) inecliptic coordinates (λ, β).[19]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWISE telescope,Eriphyla measures between 34.274 and 41.882 kilometers in diameter and its surface has analbedo between 0.1746 and 0.2829.[6][8][10][11][13] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.2438 and derives a diameter of 35.32 kilometers based on anabsolute magnitude of 9.41.[13]
