| Discovery [1] | |
|---|---|
| Discovered by | UESAC |
| Discovery site | La Silla Obs. |
| Discovery date | 29 February 1992 |
| Designations | |
| (39546) 1992 DT5 | |
| 1992 DT5 · 1999 TA162 | |
|
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) |
| Aphelion | 2.8587 AU |
| Perihelion | 2.7254 AU |
| 2.7921 AU | |
| Eccentricity | 0.0239 |
| 4.67 yr (1,704 d) | |
| 276.01 ° | |
| 0° 12m 40.68s / day | |
| Inclination | 5.2622° |
| 150.60° | |
| 304.53° | |
| Physical characteristics | |
Mean diameter | 5.34 km (calculated) [3] |
| 1167±100 h [5] | |
| 0.057 (assumed) [3] | |
| C (assumed) [3] | |
| 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 ( U=2). [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
- ^ a b c d e "39546 (1992 DT5)". Minor Planet Center. Retrieved 11 April 2018.
- ^ a b c d "JPL Small-Body Database Browser: 39546 (1992 DT5)" (2016-07-25 last obs.). Jet Propulsion Laboratory. Retrieved 11 April 2018.
- ^ a b c d e f g h "LCDB Data for (39546)". Asteroid Lightcurve Database (LCDB). Retrieved 11 April 2018.
- ^ "Asteroid (39546) 1992 DT5 – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
- ^ a b c 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. arXiv: 1504.04041. Bibcode: 2015AJ....150...75W. doi: 10.1088/0004-6256/150/3/75. S2CID 8342929.
- ^ 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: 1506.00762. Bibcode: 2015Icar..261...34V. doi: 10.1016/j.icarus.2015.08.007. S2CID 53493339.
- ^ 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. arXiv: 1611.06176. Bibcode: 2017MNRAS.465.4099C. doi: 10.1093/mnras/stw3022.
- ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. arXiv: 1502.01628. Bibcode: 2015aste.book..297N. doi: 10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form ( info Archived 16 December 2017 at the Wayback Machine)
- 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
