Astronomy:(39546) 1992 DT5
| Discovery[1] | |
|---|---|
| Discovered by | UESAC |
| Discovery site | La Silla Obs. |
| Discovery date | 29 February 1992 |
| Designations | |
| (39546) 1992 DT5 | |
| 1992 DT5 · 1999 TA162 | |
| Minor planet category | main-belt[1][2] · (middle)[3] Hoffmeister[4] |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 25.68 yr (9,378 d) |
| |{{{apsis}}}|helion}} | 2.8587 AU |
| |{{{apsis}}}|helion}} | 2.7254 AU |
| 2.7921 AU | |
| Eccentricity | 0.0239 |
| Orbital period | 4.67 yr (1,704 d) |
| Mean anomaly | 276.01° |
| Mean motion | 0° 12m 40.68s / day |
| Inclination | 5.2622° |
| Longitude of ascending node | 150.60° |
| 304.53° | |
| Physical characteristics | |
| Mean diameter | 5.34 km (calculated)[3] |
| Rotation period | 1167±100 h[5] |
| Geometric albedo | 0.057 (assumed)[3] |
| C (assumed)[3] | |
| Absolute magnitude (H) | 14.641±0.007 (R)[5] 14.7[2] 14.88±0.30[6] 15.09[3] |
(39546) 1992 DT5 is a dark Hoffmeister asteroid and exceptionally slow rotator from the central region of the asteroid belt, approximately 5.3 kilometers (3.3 miles) in diameter. The likely elongated C-type asteroid was discovered on 29 February 1992, by the Uppsala–ESO Survey of Asteroids and Comets at ESO's La Silla astronomical observatory site in northern Chile.[1]
Orbit and classification
1992 DT5 is an attributed member of the very compact Hoffmeister family (519), which, based upon its low albedo, was most likely formed from the breakup of a 50–100 kilometer-sized, carbon-rich parent body within the past several hundred million years.[7][8] The family consist of nearly 2000 known members and its namesake is the asteroid 1726 Hoffmeister.[9]
It orbits the Sun in the central main-belt at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,704 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.02 and an inclination of 5° with respect to the ecliptic.[2] The body's observation arc begins with its discovery observation at La Silla in February 1992.[1]
Physical characteristics
1992 DT5 is an assumed carbonaceous C-type asteroid.[3] The overall spectral type of the Hoffmeister family is that of a C- and F-type.[9]:23
Rotation period
In September 2013, a rotational lightcurve for this asteroid was obtained from photometric observations in the R-band at the Palomar Transient Factory in California. It gave an exceptionally long rotation period of 1167 hours with an estimated error margin of ±100 hours. According to the Light Curve Data Base (LCDB),[3] it is the 8th slowest rotating minor planet known to exist. Due to its high brightness amplitude of 0.80 magnitude, the body has a likely elongated shape ({{{1}}}).[5]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 5.3 kilometers based on an absolute magnitude of 15.09.[3]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 26 May 2002 (M.P.C. 45660).[10] As of 2018, it has not been named.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "39546 (1992 DT5)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=39546. Retrieved 11 April 2018.
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 39546 (1992 DT5)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2039546. Retrieved 11 April 2018.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (39546)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=39546%7C. Retrieved 11 April 2018.
- ↑ "Asteroid (39546) 1992 DT5 – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=39546#Asteroid%2039546EAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 27 October 2019.
- ↑ 5.0 5.1 5.2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W.
- ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V.
- ↑ Migliorini, F.; Manara, A.; di Martino, M.; Farinella, P. (June 1996). "The Hoffmeister asteroid family: inferences from physical data.". Astronomy and Astrophysics 310: 681. Bibcode: 1996A&A...310..681M.
- ↑ Carruba, V.; Novakovic, B.; Aljbaae, S. (March 2017). "The Hoffmeister asteroid family". Monthly Notices of the Royal Astronomical Society 465 (4): 4099–4105. doi:10.1093/mnras/stw3022. Bibcode: 2017MNRAS.465.4099C.
- ↑ 9.0 9.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 24 February 2018.
External links
- 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 (35001)-(40000) – Minor Planet Center
- (39546) 1992 DT5 at AstDyS-2, Asteroids—Dynamic Site
- (39546) 1992 DT5 at the JPL Small-Body Database
 |  |
