(4489) 1988 AK
Discovery [1] | |
---|---|
Discovered by | E. Bowell |
Discovery site | Lowell Obs. |
Discovery date | 15 January 1988 |
Designations | |
MPC designation | (4489) 1988 AK |
1988 AK · 1980 KA1 1989 AQ1 | |
Jupiter trojan [1][2][3] Greek [4][5] · background [5] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 37.94 yr (13,857 d) |
Aphelion | 5.5196 AU |
Perihelion | 4.9173 AU |
5.2184 AU | |
Eccentricity | 0.0577 |
11.92 yr (4,354 d) | |
174.79° | |
0° 4m 57.72s / day | |
Inclination | 22.224° |
86.540° | |
6.5830° | |
Jupiter MOID | 0.1975 AU |
TJupiter | 2.8480 |
Physical characteristics | |
Mean diameter | 76.60±0.41 km[6] 92.93±7.4 km[7] 95.02±2.47 km[8] |
12.580±0.001 h[9][a] 12.58±0.1 h[10] 12.582±0.001 h[11][a] 12.582±0.004 h[12] | |
0.050±0.003[8] 0.0514±0.009[7] 0.069±0.005[6] | |
D (SDSS-MOC)[13] D (S3OS2)[14] D (Pan-STARRS)[3][15] V–I = 0.950±0.037[3] | |
9.00[1][2][3][8] 9.1[6] 9.12±0.22[15] | |
(4489) 1988 AK, provisional designation 1988 AK, is a large Jupiter trojan from the Greek camp, approximately 90 kilometers (56 miles) in diameter. It was discovered on 15 January 1988, by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff, Arizona, in the United States.[1] The dark D-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 12.58 hours.[3] It has not yet been named since its numbering in June 1990.[16]
Contents
Orbit and classification[edit]
1988 AK is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance (see Trojans in astronomy). It is a non-family asteroid in the Jovian background population.[5][17] It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 11 months (4,354 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.06 and an inclination of 22° with respect to the ecliptic.[2]
The body's observation arc begins with its first observation as 1980 KA1 at Crimea–Nauchnij in May 1980, almost 8 years prior to its official discovery observation at Anderson Mesa.[1]
Physical characteristics[edit]
In the SDSS-based taxonomy, as well as in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), 1988 AK is a dark D-type asteroid.[13][17][14] It has also been characterized as a D-type by Pan-STARRS' survey.[3][15]
On 18 December 2012, 1988 AK has occulted the star TYC 2467-00054-1 over parts of the United States. The asteroid's brightness was measured at 16.1 and that of the star at 11.1 magnitude.[18]
Rotation period[edit]
Since 1992, several rotational lightcurves of 1988 AK have been obtained from photometric observations by Stefano Mottola, as well as Daniel Coley and Robert Stephens at the Center for Solar System Studies, California, in collaboration with Linda French and Brian Warner. Lightcurve analysis gave a well-defined rotation period of 12.582 hours with a consolidated brightness amplitude between 0.20 and 0.26 magnitude (U=3/3).[3][9][10][11][12][a]
Diameter and albedo[edit]
According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1988 AK measures between 76.60 and 95.02 kilometers in diameter and its surface has an albedo between 0.050 and 0.069.[6][7][8]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0514 and a diameter of 92.93 kilometers based on an absolute magnitude of 9.0.[3]
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Numbering and naming[edit]
This minor planet was numbered on 8 June 1990 (M.P.C. 16414).[16] As of 2018, it has not been named.[1] Up to number 5000, nearly all minor planets have received a name with only a small group of Jupiter trojans and near-Earth asteroids remaining unnamed:
Notes[edit]
- ^ a b c Lightcurve plots of (4489) 1988 AK from March 2015 and April 2016 by Daniel Coley and Robert Stephens at the Center for Solar System Studies (U81)/(U80). Quality code is 3/3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.
References[edit]
- ^ a b c d e f "4489 (1988 AK)". Minor Planet Center. Retrieved 7 June 2018.
- ^ a b c d "JPL Small-Body Database Browser: 4489 (1988 AK)" (2018-04-25 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2018.
- ^ a b c d e f g h "LCDB Data for (4489)". Asteroid Lightcurve Database (LCDB). Retrieved 7 June 2018.
- ^ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 7 June 2018.
- ^ a b c "Asteroid (4489) 1988 AK". AstDyS-2, Asteroids – Dynamic Site. Retrieved 7 June 2018.
- ^ a b c d Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. (online catalog)
- ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
- ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 15 June 2018. (online, AcuA catalog p. 153)
- ^ a b Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091.
- ^ a b French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). "Preliminary Results from a Study of Trojan Asteroids". The Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091.
- ^ a b Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091.
- ^ a b Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
- ^ a b Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
- ^ a b Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 7 June 2017.
- ^ a b c 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.
- ^ a b "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 June 2018.
- ^ a b "Asteroid (4489) 1988 AK". Small Bodies Data Ferret. Retrieved 7 June 2018.
- ^ Asteroid Occultation Updates Archived 2012-07-11 at the Wayback Machine
External links[edit]
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- (4489) 1988 AK at AstDyS-2, Asteroids—Dynamic Site
- (4489) 1988 AK at the JPL Small-Body Database