Occultation by Chaos (2018-02-02)


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Occultation circumstances

Date Fri. 2 Feb. 2018 23:46:46
Star position (ICRF) 05 21 46.2522 +29 50 43.097
C/A 0.135 arcsec
P/A 348.59 °
velocity -14.10 km/s
Geocentric distance Δ 40.7218 au
G mag* 14.8
J mag* 13.1
Magnitude drop 6.0
Uncertainty in time 221.2 sec
Uncertainty in C/A 91.4 mas
Uncertainty in projected distance 2700.8 km
Probability of occultation on centrality 8.8%
Maximum duration 42.5 sec
Moon distance to the object 85.0°
Fraction of illuminated Moon 91.9 %
Solar elongation 127.8°

Occulted star

Star source ID 3446596046838518144
Stellar catalogue GAIADR1
Star astrometric position in catalogue (ICRF) 05 21 46.2526 +29 50 43.123
Star astrometric position with proper motion (ICRF) 05 21 46.2522 +29 50 43.097
Star apparent position (date) 05 22 55.7676 +29 51 38.038
Proper motion μRA* = (-1.6 ± 2.4)mas; μDEC = (-8.5 ± 2.3) mas
Source of proper motion UCAC5
Uncertainty in the star position RA* = 7.4 mas; DEC= 7.1 mas
G magnitude 15.1
J magnitude (2MASS) 13.5

Objet

Object (19521) Chaos
Diameter 600.0 km
Apparent diameter 20.3 mas
Object astrometric position (ICRF) 05 21 46.2501 +29 50 43.229
Object apparent position (date) 05 22 55.7656 +29 51 38.170
Uncertainty in position RA* = 104.6mas DEC = 92.1mas
Apparent magnitude 21.1
Ephemeris NIMAv1
Dynamic class(1) cubewano
Semi major axis(1) 45.6 au
Eccentricity(1) 0.102
Inclination(1) 12.1°
Perihelion(1) 41.0 au
Aphelion(1) 50.2 au
(1) Data from the johnston archive list.

Sky map (Aladin)

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