_Demoulina.png) Shape model ofDemoulina from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 September 1934 |
| Designations | |
| (1335) Demoulina | |
Named after | Prof. Demoulin[2] (Belgian astronomer) |
| 1934 RE · 1954 RA | |
| main-belt · (inner) Flora[3] · background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.66 yr (30,191 days) |
| Aphelion | 2.5854AU |
| Perihelion | 1.8955 AU |
| 2.2404 AU | |
| Eccentricity | 0.1540 |
| 3.35yr (1,225 days) | |
| 255.64° | |
| 0° 17m 38.04s / day | |
| Inclination | 2.5472° |
| 172.62° | |
| 198.89° | |
| Physical characteristics | |
| Dimensions | 6.35±1.43 km[5] 7.47 km(calculated)[3] 7.484±0.130 km[6] 7.684±0.133 km[7] |
| 2.59±0.05h(poor)[8] 74.86±0.10 h[9] | |
| 0.2073±0.0275[7] 0.218±0.043[6] 0.24(assumed)[3] 0.26±0.14[5] | |
| S(assumed)[3] | |
| 12.8[3] · 12.9[1][7] · 13.06[5] · 13.89±0.74[10] | |
1335 Demoulina, provisional designation1934 RE, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 7 kilometers in diameter. Discovered byKarl Reinmuth atHeidelberg Observatory in 1934, the asteroid was named after Prof. Demoulin, a Belgian astronomer atGhent University. It has a slower-than averagespin rate of nearly 75 hours.
Demoulina was discovered on 7 September 1934, by German astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[11] Six nights later, it was independently discovered by Belgian astronomerEugène Delporte atUccle Observatory on 13 September 1934.[2] TheMinor Planet Center only recognizes the first discoverer.[11]
Demoulina is a member of theFlora family (402), a giantasteroid family and the largest family of stony asteroids in the asteroid belt.[3] However, it is a non-family asteroid of the main belt'sbackground population when applying theHierarchical Clustering Method to itsproper orbital elements.[4]
It orbits the Sun in theinner asteroid belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,225 days;semi-major axis of 2.24 AU). Its orbit has aneccentricity of 0.15 and aninclination of 3° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Heidelberg in 1934.[11]
Demoulina is an assumedS-type asteroid.[3]
In February 2006, a rotationallightcurve ofDemoulina was obtained from photometric observations by American astronomersLawrence Molnar and Melissa Haegert at theCalvin–Rehoboth Observatory in New Mexico. Lightcurve analysis gave arotation period of 74.86 hours with a brightness amplitude of 0.78magnitude (U=2+).[9] While not being aslow rotator,Demoulina's period is significantly longer than that for most asteroids. Its high brightness amplitude also indicates that it has an irregular or elongated shape.
Other photometric lightcurves which are based on a single night of observation are rated poorly (U=1).[8]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Demoulina measures between 6.35 and 7.684 kilometers in diameter and its surface has analbedo between 0.2073 and 0.26.[5][6][7]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the parent body of the Flora family, and calculates a diameter of 7.47 kilometers based on anabsolute magnitude of 12.8.[3]
Thisminor planet was named after Prof. Demoulin, a Belgian astronomer atGhent University. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 121).[2]
