1016 Anitra
Asteroid
From Wikipedia, the free encyclopedia
1016 Anitra, provisional designation 1924 QG, is a stony Florian asteroid and suspected asynchronous binary system from the inner regions of the asteroid belt, approximately 10 kilometers in diameter.
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 31 January 1924 |
| Designations | |
| (1016) Anitra | |
| Pronunciation | /ÉËniËtrÉ/ |
Named after | fictional character in drama Peer Gynt[2] |
| 1924 QG · 1929 TE1 | |
| main-belt · (inner)[3] Flora[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.42 yr (34,123 days) |
| Aphelion | 2.5035 AU |
| Perihelion | 1.9356 AU |
| 2.2196 AU | |
| Eccentricity | 0.1279 |
| 3.31 yr (1,208 days) | |
| 176.01° | |
| 0° 17m 53.16s / day | |
| Inclination | 6.0352° |
| 8.8588° | |
| 53.320° | |
| Known satellites | 1[5][6] |
| Physical characteristics | |
| Dimensions | 9.539±0.078 km[7] 10.302±0.068 km[8] 12.97 km (calculated)[3] |
| 5.928±0.001 h[9] 5.9288±0.0005 h[10] 5.929±0.001 h[11] 5.9295±0.0005 h[12] 5.92951 h[3] 5.9294±0.0001 h[6] 5.9300±0.0001 h[6] 5.930 h[13] 5.93 h[a] 5.9301±0.0003 h[14] | |
| 0.20 (assumed)[3] 0.2728±0.0572[8] 0.308±0.048[7] | |
| SMASS = S[1] · S[3] | |
| 11.8[3] · 11.9[1] · 12.0[8] | |
It was discovered on 31 January 1924, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[15] The asteroid was likely named after the fictional character Anitra from Henrik Ibsen's drama Peer Gynt.[2]
Orbit and classification
Anitra is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[4][16]:â23â
It orbits the Sun in the inner main-belt at a distance of 1.9â2.5 AU once every 3 years and 4 months (1,208 days). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic.[1] The asteroid's observation arc begins at Heidelberg, 12 days after to its official discovery observation.[15]
Physical characteristics
In the SMASS classification, Anitra is a common, stony S-type asteroid.[1]
Rotation period
In November 2015, a rotational lightcurve of Anitra was obtained from photometric observations by an international collaborations of astronomers who combined their observational results. Lightcurve analysis gave a rotation period of 5.92951 hours with a brightness amplitude of 0.30 magnitude (U=3).[6]
Binary system
Anitra is a suspected asynchronous binary asteroid, a system with a fairly large separation, for which tidal forces have been insufficient to synchronize the periods within the system's lifetime.[5][6] The likely minor-planet moon has a rotation period of 2.609 hours and is thought to orbit its primary every 240 hours. The results, however, are still tentative.[3] More than 100 known binaries from the asteroid belt have already been discovered.
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Anitra measures 9.539 and 10.302 kilometers in diameter and its surface has an albedo of 0.2728 and 0.308, respectively.[7][8]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony S-type asteroids of 0.20 and calculates a diameter of 12.97 kilometers based on an absolute magnitude of 11.8.[3]
Naming
This minor planet was probably named after the Arabian dancer Anitra, daughter of a Bedouin chief in Henrik Ibsen's drama Peer Gynt, a five-act play in verse. The music was composed by Edvard Grieg who named one piece "Anitra's Dance".[2] The minor planets (4872) and (5696) are named after Grieg and Ibsen, respectively.[2]
The official naming citation is based on research by Lutz Schmadel and feedback from astronomers R. Bremer and I. van Houten-Groeneveld.[2]
Notes
- Menke (2011) web: rotation period 5.93 hours with a brightness amplitude of 0.50 magnitude and a quality code of 2. Summary figures at Collaborative Asteroid Lightcurve Link (CALL)
