30705 Idaios
Discovery [1] | |
---|---|
Discovered by |
C. J. van Houten I. van Houten-G. T. Gehrels |
Discovery site | Palomar Obs. |
Discovery date | 16 October 1977 |
Designations | |
MPC designation | (30705) Idaios |
Pronunciation | /aɪˈdiːəs/ · eye-DEE-əs |
Named after |
Idaios [1] (Greek mythology) |
3365 T-3 · 1989 SD7 2001 QB72 | |
Jupiter trojan [1][2] Trojan [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 63.26 yr (23,106 d) |
Aphelion | 5.5095 AU |
Perihelion | 4.8966 AU |
5.2030 AU | |
Eccentricity | 0.0589 |
11.87 yr (4,335 d) | |
143.04° | |
0° 4m 58.8s / day | |
Inclination | 19.748° |
24.184° | |
342.53° | |
Jupiter MOID | 0.0445 AU |
TJupiter | 2.8790 |
Physical characteristics | |
Mean diameter | ±0.74 km 44.55[5] |
±0.001 h 15.736[6][lower-alpha 1] | |
±0.010 0.074[5] | |
D (SDSS-MOC)[7] | |
10.2[5] 10.4[1][2] | |
|
30705 Idaios (/aɪˈdiːəs/ eye-DEE-əs), provisional designation 3365 T-3, is a Jupiter trojan from the Trojan camp, approximately 45 kilometers (28 miles) in diameter. It was discovered during the third Palomar–Leiden Trojan survey at the Palomar Observatory in California in 1977.[1] The dark D-type asteroid has a rotation period of 15.7 hours.[8] It was named after the Trojan herald Idaios from Greek mythology.[1]
Discovery
Idaios was discovered on 16 October 1977, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at the Palomar Observatory in California. The body's observation arc begins with a precovery published by the Digitized Sky Survey and taken at Palomar in February 1955, more than 22 years prior to its official discovery observation.[1]
Palomar–Leiden survey
The survey designation "T-3" stands for the third Palomar–Leiden Trojan survey, named after the fruitful collaboration of the Palomar and Leiden Observatory in the 1960s and 1970s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroids.[9]
Orbit and classification
Idaios is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L5 Lagrangian point, 60° behind its orbit . It is also a non-family asteroid of the Jovian background population.[4] It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 10 months (4,335 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.06 and an inclination of 20° with respect to the ecliptic.[2]
Naming
This minor planet was named from Greek mythology after king Priam's herald Idaios, who tells him that Paris and Menelaus want to start a duel. Idaios is the younger son of Dares a priest of the god Hephaestus, who helped Idaios to escaped Diomedes as he did not want his priest to lose both his sons.[1] The official naming citation was published by the Minor Planet Center on 18 March 2003 (M.P.C. 48160).[10]
Physical characteristics
In the SDSS-based taxonomy, Idaios is a dark D-type asteroid, the most common type among the Jupiter trojans.[7][11]
Rotation period
In September 2013, a first rotational lightcurve of Idaios was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 15.733 hours with a brightness amplitude of 0.22 magnitude (U=2).[8][12]
Between 2013 and 2017, three additional period determinations were made by Robert Stephens at the Center for Solar System Studies,[13][14] with the best-rated lightcurve from 2014 showing a more refined period ±0.001 hours and an amplitude of 0.22 magnitude ( 15.736U=3).[8][6][lower-alpha 1]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Idaios measures 44.546 kilometers in diameter and its surface has an albedo of 0.074.[5]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and a diameter of 46.30 kilometers based on an absolute magnitude of 10.4.[8]
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Notes
References
- 1 2 3 4 5 6 7 8 "30705 Idaios (3365 T-3)". Minor Planet Center. Retrieved 25 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 30705 Idaios (3365 T-3)" (2018-05-19 last obs.). Jet Propulsion Laboratory. Retrieved 25 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 25 June 2018.
- 1 2 "Asteroid (30705) Idaios – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 25 June 2018.
- 1 2 3 4 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. Retrieved 25 June 2018. (online catalog)
- 1 2 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 25 June 2018.
- 1 2 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 25 June 2018.
- 1 2 3 4 "LCDB Data for (30705) Idaios". Asteroid Lightcurve Database (LCDB). Retrieved 25 June 2018.
- ↑ "Minor Planet Discoverers (by number)". Minor Planet Center. 31 May 2018. Retrieved 25 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 June 2018.
- ↑ "Asteroid 30705 Idaios". Small Bodies Data Ferret. Retrieved 25 June 2018.
- ↑ 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" (PDF). The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 25 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2015). "Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January". The Minor Planet Bulletin. 42 (3): 216–224. Bibcode:2015MPBu...42R.216S. ISSN 1052-8091. Retrieved 25 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R. (July 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March". The Minor Planet Bulletin. 44 (3): 252–257. Bibcode:2017MPBu...44..252S. ISSN 1052-8091. Retrieved 25 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (30001)-(35000) – Minor Planet Center
- 30705 Idaios at AstDyS-2, Asteroids—Dynamic Site
- 30705 Idaios at the JPL Small-Body Database