5648 Axius

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5648 Axius
Discovery[1]
Discovered byK. Endate
K. Watanabe
Discovery siteKitami Obs.
Discovery date11 November 1990
Designations
Named after
Axius
(Greek mythology)[2]
Template:Mp
Jupiter trojan[1][3]
Trojan[4] · background[5]
AdjectivesAxian
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc67.94 yr (24,816 d)
Aphelion6.0024 AU
Perihelion4.3016 AU
5.1520 AU
Eccentricity0.1651
11.69 yr (4,271 d)
178.01°
Template:Deg2DMS / day
Inclination22.693°
71.048°
268.85°
Jupiter MOID0.0521 AU
TJupiter2.8210
Physical characteristics
59.30±1.35 km[6]
63.91 km (calculated)[7]
37.56±0.05 h[8]
0.057 (assumed)[7]
0.073±0.015[6]
D (S3OS2)[9]
B–V = 0.730±0.060[10]
V–R = 0.480±0.040[10]
V–I = 0.900±0.032[7]
9.6[6]
9.7[1][3][7]
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5648 Axius, provisional designation: Template:Mp, is a Jupiter trojan from the Trojan camp, approximately 60 kilometers (37 miles) in diameter. It was discovered on 11 November 1990, by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on the northern island of Hokkaidō, Japan.[1] The dark D-type asteroid belongs to the 70 largest Jupiter trojans and has a long rotation period of 37.6 hours.[7] It was named after Axius, a river god from Greek mythology.[2]

Orbit and classification

Axius 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 Page Template:Crossreference/styles.css has no content.Page Module:Hatnote/styles.css has no content.(see Trojans in astronomy). It is also a non-family asteroid of the Jovian background population.[5]

It orbits the Sun at a distance of 4.3–6.0 AU once every 11 years and 8 months (4,271 days; semi-major axis of 5.15 AU). Its orbit has an eccentricity of 0.17 and an inclination of 23° with respect to the ecliptic.[3] The body's observation arc begins with a precovery taken at the Palomar Observatory in June 1950, more than 40 years prior to its official discovery observation.[1]

Numbering and naming

This minor planet was numbered on 1 September 1993 (M.P.C. 22480).[11] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Axius, a river god from Greek mythology, who is the son of Oceanus and Tethys, the father of Pelegon and grandfather of Asteropaios.[2]

Physical characteristics

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Axius is a dark D-type asteroid, the dominant spectral type among the larger Jupiter trojans.[9][12] It has a typical V–I color index of 0.90.[7]

Rotation period

In February 2005, Federico Manzini at the Sozzago Astronomical Station Template:Obscode in Italy obtained the first rotational lightcurve of Axius. It gave a tentative rotation period of 16.04 hours with a brightness amplitude of 0.22 based on three nights of observation magnitude (U=2).[7][13]

In June 2006, photometric observations over eight nights were made by Italian astronomer Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a rotation period of 37.56±0.05 hours with a brightness amplitude of 0.20 magnitude (U=3-), superseding Manzini's previous result.[8] A concurring period of 37.6083 hours with an amplitude of 0.19 magnitude was measured by astronomers at the Palomar Transient Factory in October 2013 (U=2).[14] While not being a slow rotator, its period is significantly longer than that of most larger Jupiter trojans (see list below).

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Axius measures 59.30 kilometers in diameter and its surface has an albedo 0.073,[6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 63.91 kilometers based on an absolute magnitude of 9.7.[7] A diameter measurement for this asteroid has not been previously published by Akari and IRAS.[a]

Template:Largest Jupiter trojans

Notes

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  1. ^ No diameter given in the Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey, see AcuA catalog p. 153 and in the IRAS Minor Planet Survey V6.0 (SIMPS), see IRAS-A-FPA-3-RDR-IMPS-V6.0 at NASA's Planetary Data System.

References

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  1. ^ a b c d e Page Module:Citation/CS1/styles.css has no content."5648 (1990 VU1)". Minor Planet Center. Retrieved 17 June 2018.
  2. ^ a b c Page Module:Citation/CS1/styles.css has no content."WGSBN Bulletin Archive". Working Group for Small Bodies Nomenclature. 14 May 2021. Retrieved 16 May 2021. (Bulletin #1)
  3. ^ a b c d Page Module:Citation/CS1/styles.css has no content."JPL Small-Body Database Browser: 5648 (1990 VU1)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 17 June 2018.
  4. ^ Page Module:Citation/CS1/styles.css has no content."List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 17 June 2018.
  5. ^ a b Page Module:Citation/CS1/styles.css has no content."Asteroid (5648) 1990 VU1 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 17 June 2018.
  6. ^ a b c d Page Module:Citation/CS1/styles.css has no content.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. (online catalog)
  7. ^ a b c d e f g h Template:Cite LCDB
  8. ^ a b Page Module:Citation/CS1/styles.css has no content.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" (PDF). The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Archived from the original (PDF) on 13 January 2024.
  9. ^ a b Page Module:Citation/CS1/styles.css has no content.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 17 June 2018.
  10. ^ a b Page Module:Citation/CS1/styles.css has no content.Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026.
  11. ^ Page Module:Citation/CS1/styles.css has no content."MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 June 2018.
  12. ^ Page Module:Citation/CS1/styles.css has no content."Asteroid (5648) 1990 VU1". Small Bodies Data Ferret. Retrieved 17 June 2018.
  13. ^ Page Module:Citation/CS1/styles.css has no content.Behrend, Raoul. "Asteroids and comets rotation curves – (5648)". Geneva Observatory. Retrieved 29 June 2016.
  14. ^ Page Module:Citation/CS1/styles.css has no content.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.

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