_Mimi.png) Modelled shape ofMimi from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | S. Arend |
| Discovery site | Uccle Obs. |
| Discovery date | 13 January 1929 |
| Designations | |
| (1127) Mimi | |
Named after | "Mimi" Delporte (wife ofEugène Delporte)[2] |
| 1929 AJ · 1948 PU A906 OA | |
| Orbital characteristics[3] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.10 yr (31,812 days) |
| Aphelion | 3.2821AU |
| Perihelion | 1.9104 AU |
| 2.5962 AU | |
| Eccentricity | 0.2642 |
| 4.18yr (1,528 days) | |
| 122.26° | |
| 0° 14m 8.16s / day | |
| Inclination | 14.745° |
| 128.63° | |
| 281.95° | |
| Physical characteristics | |
| 46.006±0.305 km[6] 46.18±10.10 km[7] 46.84±4.9 km[8][9] 48.198±0.465 km[10] 49.53±0.67 km[11] 50.67±13.81 km[12] | |
| 8.5410±0.0004 h[13] 8.541±0.1 h[14] 12.749±0.003 h[15] | |
| (224.0°, −57.0°) (λ1/β1)[5] | |
| 0.031±0.001[11] 0.0317±0.0133[10] 0.0336±0.008[8][9] 0.034±0.005[6] 0.04±0.02[7][12] | |
| 10.6[1][3][8][9][11] | |
1127 Mimi (prov. designation:1929 AJ) is a darkbackground asteroid from the central regions of theasteroid belt. It was discovered on 13 January 1929, by Belgian astronomerSylvain Arend at theRoyal Observatory of Belgium in Uccle.[1] The carbonaceousC-type asteroids (CX) has arotation period of 12.7 hours and measures approximately 47 kilometers (29 miles) in diameter. Through a glitch in the naming process, the asteroid received the name "Mimi" instead of "Robelmonte" as originally intended by the discoverer.[2]
Mimi is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5] It orbits the Sun in thecentral asteroid belt at a distance of 1.9–3.3 AU once every 4 years and 2 months (1,528 days). Its orbit has aneccentricity of 0.26 and aninclination of 15° with respect to theecliptic.[3] The asteroid was first observed asA906 OA atHeidelberg Observatory in July 1906. The body'sobservation arc begins at Uccle in May 1934, more than 5 years after its official discovery observation.[1]
Thisminor planet was named after "Mimi" the wife of Belgian astronomerEugène Delporte. Through an error, the names intended for 1127 Mimi (wife of Delporte) and1145 Robelmonte (birthplace of Arend) had been switched, and each name had been proposed by the discoverer of the other asteroid. Thenaming was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 105).[2]
Mimi has been characterized as a darkP-type asteroid by theWide-field Infrared Survey Explorer (WISE). In theTholen classification, no unambiguous type could by assigned. Numerical color analysis showed that it is closest to theC-type asteroids and somewhat similar to theX-type asteroids (CX).[3]
In January 2004, the best-rated rotationallightcurve ofMimi was obtained fromphotometric observations by astronomer John Menke at his Menke Observatory in Barnesville, Maryland (no obs. code). Lightcurve analysis gave a well-definedrotation period of 12.749 hours with a brightness amplitude of 0.72magnitude (U=3).[15] Two other lightcurves gave a shorter period of 8.541 hours with an amplitude of 0.93 and 0.95 magnitude, respectively (U=2/2).[13][14]
A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database (LPD), gave a concurring period of 12.74557 hours, as well as a spin axis of (224.0°, −57.0°) inecliptic coordinates (λ, β).[16]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA's WISE telescope,Mimi measures between 46.006 and 50.67 kilometers in diameter and its surface has analbedo between 0.031 and 0.04.[6][7][8][10][11][12]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0336 and a diameter of 46.84 kilometers based on anabsolute magnitude of 10.95.[9]
