|Discovered by||E. Delporte|
|Discovery site||Uccle Obs.|
|Discovery date||30 October 1937|
|MPC designation||(1433) Geramtina|
Sister of Bror Asplind |
1937 UC · 1951 XH|
1967 EH · 1974 TX1
main-belt · (outer) |
Gefion  · background 
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 0|
|Observation arc||79.92 yr (29,191 days)|
|4.68 yr (1,708 days)|
|0° 12m 38.88s / day|
±0.209 km 12.687|
14.22 km (calculated)
±0.247 km 14.574
|SMASS = S  · S |
|±0.2311.43 · 11.60|
1433 Geramtina, provisional designation 1937 UC, is a stony Gefion asteroid from the central regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle on 30 October 1937.
The asteroid was named "Geramtina" after the sister of Swedish astronomer Bror Asplind. Geramtina has an ordinary chondritic composition and has been considered a candidate for being the parent body of the H chondrites. However, results are inconclusive, and recent HCM analysis suggest that Geramtina is a Gefionian interloper rather than a core member of the family. The asteroid has a tentative rotation period of 14 hours.
Orbit and classification
Geramtina is a core member of the dynamical Gefion family (516). However, it is a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements (synthetic), suggesting that Geramtina is an interloper rather than a core member.
It orbits the Sun in the central main-belt at a distance of 2.3–3.3 AU once every 4 years and 8 months (1,708 days). Its orbit has an eccentricity of 0.17 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Uccle in 1937.
The spectra of Geramtina together with 4182 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 the L chondrites, a common group of meteorites, due to their dynamical and compositional characteristics. Spectra obtained with the 3-meter NASA IRTF telescope, however, were inconclusive and suggest that Geramtina might as well be a H 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 of interlopers which needs to be ruled out first.
In October 2007, a rotational lightcurve of Geramtina was obtained from photometric observations at the National Undergraduate Research Observatory, NURO, in Flagstaff, Arizona. Lightcurve analysis gave a tentative rotation period of 14 hours (monomodal solution) with a brightness amplitude of 0.07 magnitude (U=2-). 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.
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Geramtina measures 12.687 and 14.574 kilometers in diameter and its surface has an albedo of 0.251 and 0.1910, respectively.
This minor 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 the 6th IAU General Assembly in Stockholm in 1938. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 129).
- "JPL Small-Body Database Browser: 1433 Geramtina (1937 UC)" (2017-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 26 October 2017.
- Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1433) Geramtina. Springer Berlin Heidelberg. p. 115. ISBN 978-3-540-00238-3. Retrieved 26 October 2017.
- "LCDB Data for (1433) Geramtina". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2017.
- Roberts, V. R.; Gaffey, Michael J.; Fieber-Beyer, Sherry K. (March 2013), Mineralogical Assessment of two Gefion Family Asteroids: 1433 Geramtina and 4182 Mount Locke (PDF), retrieved 26 October 2017
- "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 October 2017.
- Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv: . Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 October 2017.
- Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv: . Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 October 2017.
- Johnson, Thomas; Pech, Katherin; van Schilfgaarde, Ryan; Chase, Matt; Burns, M. Shane (October 2008). "Lightcurve Analysis of 102 Miriam, 1433 Geramtina, and 2648 Owa". The Minor Planet Bulletin. 35 (4): 151–152. Bibcode:2008MPBu...35..151J. ISSN 1052-8091. Retrieved 26 October 2017.
- Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv: . Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 26 October 2017.
- "1433 Geramtina (1937 UC)". Minor Planet Center. Retrieved 26 October 2017.
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1433 Geramtina at the JPL Small-Body Database