1870 Glaukos

From Wikipedia, the free encyclopedia
1870 Glaukos
Discovery [1]
Discovered byC. J. van Houten
I. van Houten-G.
T. Gehrels
Discovery sitePalomar Obs.
Discovery date24 March 1971
Designations
(1870) Glaukos
Pronunciation/ˈɡlɔːkəs/[6]
Named after
Glaucus
(Greek mythology)[2]
Alternative designations
1971 FE · 1976 SM
Minor planet category
Jupiter trojan [1][3]
Trojan [4] · background [5]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc62.50 yr (22,827 d)
Aphelion5.4155 AU
Perihelion5.0765 AU
5.2460 AU
Eccentricity0.0323
12.02 yr (4,389 d)
215.92°
0° 4m 55.2s / day
Inclination6.5763°
176.30°
129.91°
Jupiter MOID0.1272 AU
TJupiter2.9860
Physical characteristics
Mean diameter
47.65±0.77 km[7]
5.986±0.003 h[8][a]
0.049±0.007[7]
D (Pan-STARRS)[9][10]
D (SDSS-MOC)[11][12]
Absolute magnitude (H)
10.5[7]
10.6[1][3][9]

1870 Glaukos /ˈɡlɔːkəs/ is a mid-sized Jupiter trojan from the Trojan camp, approximately 47 kilometers (29 miles) in diameter. Discovered during the first Palomar–Leiden Trojan survey in 1971, it was later named for Glaucus from Greek mythology.[1] The dark D-type asteroid has a rotation period of 6.0 hours.[9]

Discovery[]

Glaukos was discovered on 24 March 1971, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by astronomer Tom Gehrels at the Californian Palomar Observatory in California.[1] The body's observation arc begins with a precovery of its first recorded observation at Palomar in November 1955, or more than 15 years prior to its official discovery observation.[1]

This discovery was made in the context of a larger survey of faint Trojans. The trio of Dutch and Dutch–American astronomers also collaborated on the productive Palomar–Leiden survey in the 1960s, using the same procedure as for this (smaller) survey: Tom Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis and Ingrid van Houten at Leiden Observatory where astrometry was carried out.

More than 7000 Jupiter trojans have already been discovered.[4]

Orbit and classification[]

Glaukos is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the trailing Trojan camp at the Gas Giant's L5 Lagrangian point, 60° behind its orbit (see Trojans in astronomy).[4] It is also a non-family asteroid of the Jovian background population.[5] It orbits the Sun at a distance of 5.1–5.4 AU once every 12.02 years (4,389 days; semi-major axis of 5.25 AU). Its orbit has an eccentricity of 0.03 and an inclination of 7° with respect to the ecliptic.[3]

Physical characteristics[]

Glaukos has been characterized as a dark D-type asteroid by PanSTARRS' photometric survey as well as in the SDSS-based taxonomy.[9][10][11][12] It is the most common spectral type among the Jupiter trojans.

Lightcurves[]

In 2012 and 2013, three rotational lightcurves of Glaukos in the R- and S-band were obtained by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 5.979, 5.980 and 5.989 hours with an amplitude between 0.27 and 0.37 magnitude (U=2/2/2).[9][13]

In October 2013, photometric observations by American astronomer Robert Stephens at the Center for Solar System Studies gave the so-far best rated lightcurve, with a period of 5.986±0.003 hours and a brightness variation of 0.42 magnitude (U=3).[8][a]

Diameter and albedo[]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Glaukos measures 47.65 kilometers in diameter, and its surface has an albedo of 0.049,[7] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 42.23 kilometers with an absolute magnitude of 10.6.[9]

100+ largest Jupiter trojans

Naming[]

This minor planet was named after Glaucus (Glaukos) from Greek mythology. In Homer's Iliad, he was captain in the Lycian contingent during the Trojan War. and was killed by Ajax, after whom the Jovian asteroid 1404 Ajax is named.[2] The official naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3826).[14]

Notes[]

  1. ^ Jump up to: a b c Lightcurve plots of (1870) Glaukos from Oct 2013 by Robert Stephens at the Center for Solar System Studies (U80). Quality code is 3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References[]

  1. ^ Jump up to: a b c d e f "1870 Glaukos (1971 FE)". Minor Planet Center. Retrieved 21 June 2018.
  2. ^ Jump up to: a b Schmadel, Lutz D. (2007). "(1870) Glaukos". Dictionary of Minor Planet Names – (1870) Glaukos. Springer Berlin Heidelberg. p. 150. doi:10.1007/978-3-540-29925-7_1871. ISBN 978-3-540-00238-3.
  3. ^ Jump up to: a b c d "JPL Small-Body Database Browser: 1870 Glaukos (1971 FE)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 December 2016. Retrieved 21 June 2018.
  4. ^ Jump up to: a b c "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 21 June 2018.
  5. ^ Jump up to: a b "Asteroid (1870) Glaukos – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 October 2019.
  6. ^ 'Glaucus' in Noah Webster (1884) A Practical Dictionary of the English Language
  7. ^ Jump up to: 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. S2CID 119101711. Retrieved 21 June 2018. (online catalog)
  8. ^ Jump up to: a b Stephens, Robert D.; French, Linda M.; Davitt, Chelsea; Coley, Daniel R. (April 2014). "At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013". The Minor Planet Bulletin. 41 (2): 95–100. Bibcode:2014MPBu...41...95S. ISSN 1052-8091. Retrieved 21 June 2018.
  9. ^ Jump up to: a b c d e f "LCDB Data for (1870) Glaukos". Asteroid Lightcurve Database (LCDB). Retrieved 21 June 2018.
  10. ^ Jump up to: a b 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.
  11. ^ Jump up to: 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)
  12. ^ Jump up to: a b "Asteroid 1870 Glaukos". Small Bodies Data Ferret. Retrieved 20 October 2019.
  13. ^ 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.
  14. ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External links[]

Retrieved from ""