Occultation by Ixion (2018-06-13)


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Occultation circumstances

Date Wed. 13 Jun. 2018 09:21:54
Star position (ICRF) 17 42 37.9275 -28 48 32.113
C/A 0.181 arcsec
P/A 357.68 °
velocity -24.94 km/s
Geocentric distance Δ 38.4623 au
G mag* 16.8
RP mag* 15.9
Magnitude drop 3.2
Uncertainty in time 119.2 sec
Uncertainty in C/A 51.0 mas
Uncertainty in projected distance 1423.5 km
Probability of occultation on centrality 15.3%
Maximum duration 22.0 sec
Moon distance to the object 166.2°
Fraction of illuminated Moon 0.4 %
Solar elongation 173.2°

Occulted star

Star source ID 4057177226231283712
Stellar catalogue GAIADR2
Star astrometric position in catalogue (ICRF) 17 42 37.9271 -28 48 32.122
Star astrometric position with proper motion (ICRF) 17 42 37.9275 -28 48 32.113
Star apparent position (date) 17 43 48.6469 -28 48 52.879
Proper motion μRA* = (1.8 ± 0.1)mas; μDEC = (3.0 ± 0.1) mas
Source of proper motion GAIADR2
Uncertainty in the star position RA* = 0.4 mas; DEC= 0.4 mas
G magnitude 16.5
RP magnitude (GaiaDR2) 15.6

Objet

Object (28978) Ixion
Diameter 549.0 km
Apparent diameter 19.7 mas
Object astrometric position (ICRF) 17 42 37.9269 -28 48 31.933
Object apparent position (date) 17 43 48.6463 -28 48 52.698
Uncertainty in position RA* = 107.7mas DEC = 48.5mas
Apparent magnitude 19.7
Ephemeris NIMAv5
Dynamic class(1) plutino
Semi major axis(1) 39.7 au
Eccentricity(1) 0.242
Inclination(1) 19.6°
Perihelion(1) 30.1 au
Aphelion(1) 49.3 au
(1) Data from the johnston archive list.

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