| Discovery[1] | |
|---|---|
| Discovered by | E. Delporte |
| Discovery site | Uccle Obs. |
| Discovery date | 30 October 1937 |
| Designations | |
| (1433) Geramtina | |
Named after | Sister of Bror Asplind[2] (Swedish astronomer) |
| 1937 UC · 1951 XH 1967 EH · 1974 TX1 | |
| main-belt · (outer)[3] Gefion[4][5] · background[6] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 79.92 yr (29,191 days) |
| Aphelion | 3.2757AU |
| Perihelion | 2.3162 AU |
| 2.7960 AU | |
| Eccentricity | 0.1716 |
| 4.68yr (1,708 days) | |
| 19.222° | |
| 0° 12m 38.88s / day | |
| Inclination | 8.2369° |
| 321.57° | |
| 93.975° | |
| Physical characteristics | |
| Dimensions | 12.687±0.209 km[7] 14.22 km(calculated)[3] 14.574±0.247 km[8] |
| 14h[9] | |
| 0.1910±0.0170[8] 0.20(assumed)[3] 0.251±0.027[7] | |
| SMASS =S[1][3] · S[10] | |
| 11.43±0.23[10] · 11.60[1][3][7][8] | |
1433 Geramtina, provisional designation1937 UC, is a stony Gefionasteroid from the central regions of theasteroid belt, approximately 14 kilometers in diameter. It was discovered by Belgian astronomerEugène Delporte at theRoyal Observatory of Belgium in Uccle on 30 October 1937.[11]
The asteroid was named "Geramtina" after the sister of Swedish astronomer Bror Asplind.Geramtina has anordinary chondritic composition and has been considered a candidate for being the parent body of theH chondrites. However, results are inconclusive, and recentHCM analysis suggest thatGeramtina is a Gefionianinterloper rather than a core member of the family. The asteroid has a tentativerotation period of 14 hours.
Geramtina is a core member of theGefion family (516), which is also known as Minerva family.[4][5] However, it is a non-family asteroid of the main belt'sbackground population according to Nesvorny's application of the body'sproper orbital elements to thehierarchical clustering method (synthetic),[6] suggesting thatGeramtina is aninterloper rather than a core member.
It orbits the Sun in thecentral main-belt at a distance of 2.3–3.3 AU once every 4 years and 8 months (1,708 days). Its orbit has aneccentricity of 0.17 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Uccle in 1937.[11]
In theSMASS classification,Geramtina is a common, stonyS-type asteroid.[1] The photometric survey byPan-STARRS has also characterized the asteroid as an S-type.[10]
The spectra ofGeramtina together with4182 Mount Locke have been studies in a mineralogical assessment to test whether these considered core members of the Gefion family might be the source of theL chondrites, a common group ofmeteorites, due to their dynamical and compositional characteristics.[4] Spectra obtained with the 3-meterNASA IRTF telescope, however, were inconclusive and suggest thatGeramtina might as well be aH chondrite rather than an L chondrite, but allows for the determination of a general S(IV)ordinary chondritic composition. The researchers also acknowledged that the Gefion family space has a high abundance ofinterlopers which needs to be ruled out first.[4]
In October 2007, a rotationallightcurve ofGeramtina was obtained from photometric observations at the National Undergraduate Research Observatory, NURO, in Flagstaff, Arizona. Lightcurve analysis gave a tentativerotation period of 14 hours (monomodal solution) with a brightness amplitude of 0.07magnitude (U=2-).[9] Alternatively, it has a bimodal period solution of 28 hours, which is considered more likely by the observers, but ignored by the Asteroid Lightcurve Data Base.[3][9]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Geramtina measures 12.687 and 14.574 kilometers in diameter and its surface has analbedo of 0.251 and 0.1910, respectively.[7][8]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo of stony asteroids 0.20 and calculates a diameter of 14.22 kilometers based on anabsolute magnitude of 11.6.[3]
Thisminor planet was named by Swedish astronomer Bror Ansgar Asplind (1890–1954) after his sister. The name "Geramtina" is a constructed name. Bror Asplind computed the orbits of several discoveries made at Uccle Observatory in preparation of the6th IAU General Assembly in Stockholm in 1938. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 129).[2]
