| Discovery[1] | |
|---|---|
| Discovered by | M. Laugier |
| Discovery site | Nice Obs. |
| Discovery date | 8 November 1948 |
| Designations | |
| (1690) Mayrhofer | |
Named after | Karl Mayrhofer (amateur astronomer)[2] |
| 1948 VB · 1932 WN 1953 VC2 · 1956 GN | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.11 yr (30,723 days) |
| Aphelion | 3.3376AU |
| Perihelion | 2.7395 AU |
| 3.0386 AU | |
| Eccentricity | 0.0984 |
| 5.30yr (1,935 days) | |
| 24.198° | |
| 0° 11m 9.96s / day | |
| Inclination | 13.049° |
| 230.45° | |
| 156.46° | |
| Physical characteristics | |
| Dimensions | 31.18±0.49 km[4] 31.198±7.539 km[5] 31.63 km(derived)[3] 31.71±2.0 km[6] 33.810±1.378 km[7] |
| 19.0808±0.1110h[8] 22.194±0.004 h[9] | |
| 0.056±0.012[7] 0.0641(derived)[3] 0.0767±0.011[6] 0.0792±0.0384[5] 0.082±0.003[4] | |
| C[3] | |
| 10.9[4][5][6] · 10.91±0.34[10] · 10.950±0.004(R)[8] · 11.1[1][3][7] | |
1690 Mayrhofer, provisional designation1948 VB, is a carbonaceousasteroid from the outer region of theasteroid belt, approximately 32 kilometers in diameter. It was discovered on 8 November 1948, by French astronomerMarguerite Laugier atNice Observatory in south-east France.[11] It was later named after Austrian amateur astronomerKarl Mayrhofer.[2]
TheC-type asteroid orbits the Sun in theouter main-belt at a distance of 2.7–3.3 AU once every 5 years and 4 months (1,935 days). Its orbit has aneccentricity of 0.10 and aninclination of 13° with respect to theecliptic.[1] First identified as1932 WN atUccle,Mayrhofer'sobservation arc begins with its first used observation taken atGoethe Link Observatory in 1953, or 5 years after its official discovery observation at Nice.[11]
In November 2006, a rotationallightcurve ofMayrhofer was obtained from observations taken by French amateur astronomerPierre Antonini, giving arotation period of 22.194 hours with a brightness variation of 0.45 inmagnitude (U=2).[9] Photometric observation in the R-band at thePalomar Transient Factory in November 2011, gave a shorter period of 19.0808 hours with an amplitude of 0.30 magnitude (U=2).[8]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Mayrhofer measures between 31.18 and 33.81 kilometers in diameter, and its surface has analbedo between 0.056 and 0.082.[4][5][6][7] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.064 and a diameter of 31.63 kilometers based on anabsolute magnitude of 11.1.[3]
Proposed by German catholic priest and amateur astronomerOtto Kippes, this minor planet was named after Austrian amateur astronomer Karl Mayrhofer (1903–1982). He lived in the Austrian town ofRied im Innkreis and was known for his calculations oforbital elements for asteroids.[2] Naming citation was published on 1 October 1980 (M.P.C. 5523).[12]
