 Orbital diagram of 1046 Edwin | |
| Discovery[1] | |
|---|---|
| Discovered by | G. van Biesbroeck |
| Discovery site | Yerkes Obs. |
| Discovery date | 1 December 1924 |
| Designations | |
| (1046) Edwin | |
Named after | Edwin Van Biesbroeck[2] (discoverer's son) |
| 1924 UA · 1949 RB 1949 YL | |
| main-belt[1][3] · (outer)[4] background[5] | |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.86yr (33,553 d) |
| Aphelion | 3.1769AU |
| Perihelion | 2.7895 AU |
| 2.9832 AU | |
| Eccentricity | 0.0649 |
| 5.15 yr (1,882 d) | |
| 53.846° | |
| 0° 11m 28.68s / day | |
| Inclination | 7.8991° |
| 10.745° | |
| 47.898° | |
| Physical characteristics | |
| 25.15±0.66 km[6] 29.084±0.405 km[7] 36.355±0.604 km[8] 42.23 km(calculated)[4] | |
| 5.29±0.01 h[9][a] 5.2906±0.0001 h[10] 5.296±0.006 h[10] 5.30±0.02 h[11] | |
| 0.057(assumed)[4] 0.1113±0.0145[8] 0.201±0.039[7] 0.235±0.014[6] | |
| SMASS =Xe[3] · M[8] | |
| 10.20[6][8] · 10.6[3][4] 11.08±0.29[12] | |
1046 Edwin, provisional designation1924 UA, is a backgroundasteroid from the outer regions of theasteroid belt, approximately 30 kilometers (20 miles) kilometers in diameter. It was discovered on 1 December 1924, by Belgian–American astronomerGeorge Van Biesbroeck at theYerkes Observatory in Wisconsin, United States, who named it after his son, Edwin Van Biesbroeck.[1] The potentially metallic asteroid has a shortrotation period of 5.29 hours.[4]
Edwin is a non-family asteroid from the main belt'sbackground population.[5] It orbits the Sun in theouter asteroid belt at a distance of 2.8–3.2 AU once every 5 years and 2 months (1,882 days;semi-major axis of 2.98 AU). Its orbit has aneccentricity of 0.06 and aninclination of 8° with respect to theecliptic.[3] The body'sobservation arc begins with its first recorded observation atHeidelberg Observatory in March 1926, or 15 months after its official discovery observation at Yerkes Observatory.[1]
In theSMASS classification,Edwin is an Xe-subtype that transitions from theX-type to the very brightE-type asteroid[3] It has also been characterized as a metallicM-type asteroid by theWide-field Infrared Survey Explorer (WISE).[8]
Since 2001, several rotationallightcurves ofEdwin have been obtained fromphotometric observations by American William Koff at the Antelope Hills Observatory (H09) in Colorado,[9][a] Richard Ditteon at theOakley Observatory in Indiana,[11] and French amateur astronomersPierre Antonini,René Roy andStéphane Charbonnel.[10]
Analysis of the best-rated lightcurve byPierre Antonini from November 2006, gave arotation period of 5.2906 hours with a brightness amplitude of 0.27magnitude (U=3).[4][10] While not being afast rotator, it has a relatively short spin-rate for an asteroid of its size.
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA's WISE telescope,Edwin measures between 25.15 and 36.355 kilometers in diameter and its surface has analbedo between 0.1113 and 0.235.[6][7][8]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo forcarbonaceous asteroids of 0.057 and consequently calculates a larger diameter of 42.23 kilometers based on anabsolute magnitude of 10.6.[4]
Thisminor planet was named after Edwin Van Biesbroeck, son of discovererGeorge Van Biesbroeck. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 99).[2]
