Discovery | |
---|---|
Discovered by | Deep Ecliptic Survey |
Discovery date | 19 November 1998 |
Designations | |
(19521) Chaos | |
Pronunciation | /ˈkeɪ.ɒs/ |
Named after | Chaos |
1998 WH24 | |
TNO ( cubewano) [1] [2] | |
Adjectives | Chaotian /keɪˈoʊʃən/ [3] |
Symbol | (astrological) |
Orbital characteristics [4] | |
Epoch 13 January 2016 ( JD 2457400.5) | |
Uncertainty parameter 3 | |
Observation arc | 5902 days (16.16 yr) |
Earliest precovery date | 17 October 1991 |
Aphelion | 50.636 AU (7.5750 Tm) |
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]
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]
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]
19521 Chaos has an orbital period of approximately 309 years. Its orbit is longer, but less eccentric than the orbit of Pluto. 19521 Chaos's orbit is inclined approximately 12° to the ecliptic. Its orbit never crosses the orbit of Neptune. Currently, the closest approach possible to Neptune ( MOID) is 12.5 AU (1.87 billion km). [6]
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.
{{
cite journal}}
: CS1 maint: multiple names: authors list (
link) CS1 maint: numeric names: authors list (
link)
Discovery | |
---|---|
Discovered by | Deep Ecliptic Survey |
Discovery date | 19 November 1998 |
Designations | |
(19521) Chaos | |
Pronunciation | /ˈkeɪ.ɒs/ |
Named after | Chaos |
1998 WH24 | |
TNO ( cubewano) [1] [2] | |
Adjectives | Chaotian /keɪˈoʊʃən/ [3] |
Symbol | (astrological) |
Orbital characteristics [4] | |
Epoch 13 January 2016 ( JD 2457400.5) | |
Uncertainty parameter 3 | |
Observation arc | 5902 days (16.16 yr) |
Earliest precovery date | 17 October 1991 |
Aphelion | 50.636 AU (7.5750 Tm) |
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]
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]
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]
19521 Chaos has an orbital period of approximately 309 years. Its orbit is longer, but less eccentric than the orbit of Pluto. 19521 Chaos's orbit is inclined approximately 12° to the ecliptic. Its orbit never crosses the orbit of Neptune. Currently, the closest approach possible to Neptune ( MOID) is 12.5 AU (1.87 billion km). [6]
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.
{{
cite journal}}
: CS1 maint: multiple names: authors list (
link) CS1 maint: numeric names: authors list (
link)