19521 Chaos
Perihelion 40.957 AU (6.1271 Tm) | | |
| 45.796 AU (6.8510 Tm) | ||
| Eccentricity | 0.10567 | |
| 309.92 yr (113199 d) | ||
Average orbital speed | 4.3931 km/s | |
| 337.2998° | ||
| 0° 0m 11.449s / day | ||
| Inclination | 12.0502° | |
| 50.0239° | ||
| ≈ 23 December 2033[5] ±10 days | ||
| 58.4097° | ||
| Jupiter MOID | 35.8 AU (5.36 Tm) | |
| Neptune MOID | 12.5 AU (1.87 Tm)[6] | |
| TJupiter | 5.884 | |
| Physical characteristics | ||
| Dimensions | 612 km (est. at 0.05)[7] 600+140 −130 km [8] ~665 [9] | |
| 0.050+0.030 −0.016 [8] | ||
| B–V=0.95±0.03 [9] V–R=0.63±0.03 [9] V–I=1.25±0.04 [9] | ||
| 4.8 [4] 5.0 [7][9] | ||
19521 Chaos is a
cubewano, a Kuiper-belt object not in resonance with any planet. Chaos was discovered in 1998 by the Deep Ecliptic Survey with Kitt Peak's 4 m telescope. Its albedo is 0.050+0.030
−0.016,[8] making it, with its absolute magnitude (H) of 4.8,[4] equivalent to a single spherical body 600+140
−130 km in diameter.[8]
−0.016,[8] making it, with its absolute magnitude (H) of 4.8,[4] equivalent to a single spherical body 600+140
−130 km in diameter.[8]
On 20 November 2020, Chaos
occulted a magnitude 16.8 star. Three observers detected the occultation, finding that the object is likely smaller than 600 km in diameter.[10] Another occultation was recorded on 14 January 2022; full results on size, shape, geometric albedo, and the spin-axis orientation have not been released[needs update].[11] A further occultation occurred on 28 September 2023, with a shadow crossing most of North America. This occultation was observed by over 30 observers;[12]
preliminary analysis suggests that Chaos is a binary (possibly a contact binary).[13]
Name
It is named after the primeval state of existence in Greek mythology, from which the first gods appeared.
Planetary symbols are no longer much used in astronomy, so Chaos never received a symbol in the astronomical literature. There is no standard symbol for Chaos used by astrologers either. Michael Moorcock's Symbol of Chaos (
) has been used.[14]
.svg){kind=small}
) has been used.[14]Orbit
19521 Chaos has an orbital period of approximately 309 years. Its orbit is longer, but less eccentric than the orbit of
Chaos will come to perihelion at around December 2033,[5] coming as close as 40 AUs from Earth. Its brightest magnitude will be 20.8.
References
- ^ "MPEC 2008-O05 : Distant Minor Planets (2008 AUG. 2.0 TT)". Minor Planet Center. 17 July 2008. Retrieved 8 January 2011.
- Buie, Marc W. (9 November 2004). "Orbit Fit and Astrometric record for 19521". Space Science Department. SwRI. Retrieved 28 September 2008.
- ]
- ^ a b c "19521 Chaos (1998 WH24)". JPL Small-Body Database Browser (2007-12-14 last obs). Retrieved 11 April 2016.
- ^ 3-sigma.)
- ^ a b "(19521) Chaos = 1998 WH24 orbit". IAU Minor Planet Center. Retrieved 10 February 2018.
- ^ a b Brown, Michael E. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 25 December 2018.
- ^ S2CID 54222700.
- ^ S2CID 30565926.
- . EPSC2021-626. Retrieved 26 June 2022.
- . EPSC2022-520. Retrieved 2 January 2023.
- ^ Gault, Dave. "OccultWatcher Cloud". OccultWatcher. Retrieved 29 September 2023.
- Bibcode:2023pses.conf80462G.)
{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link - ^ Miller, Kirk (26 October 2021). "Unicode request for dwarf-planet symbols" (PDF). unicode.org.
External links
- "Original Minor Planet Electronic Circular (1998-X08) for 19521 Chaos".
- "Revised Minor Planet Electronic Circular (1999-V03) 19521 Chaos".
- 19521 Chaos at AstDyS-2, Asteroids—Dynamic Site
- 19521 Chaos at the JPL Small-Body Database
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| Consensus | _(cropped).jpg)  | ||||||||||||||||||
| Possible |
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