Occultation by 2010EK139 (2018-03-21)


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Occultation circumstances

Date Wed. 21 Mar. 2018 04:14:23
Star position (ICRF) 14 00 50.5282 -39 24 59.957
C/A 0.073 arcsec
P/A 349.84 °
velocity -19.26 km/s
Geocentric distance Δ 35.6958 au
G mag* 14.5
J mag* 13.1
Magnitude drop 5.1
Uncertainty in time 76.8 sec
Uncertainty in C/A 54.8 mas
Uncertainty in projected distance 1419.2 km
Probability of occultation on centrality 13.2%
Maximum duration 24.4 sec
Moon distance to the object 149.4°
Fraction of illuminated Moon 14.8 %
Solar elongation 131.8°

Occulted star

Star source ID 6114340456477763328
Stellar catalogue GAIADR1
Star astrometric position in catalogue (ICRF) 14 00 50.5292 -39 24 59.937
Star astrometric position with proper motion (ICRF) 14 00 50.5282 -39 24 59.957
Star apparent position (date) 14 01 57.3958 -39 30 07.818
Proper motion μRA* = (-3.4 ± 2.1)mas; μDEC = (-6.5 ± 2.1) mas
Source of proper motion UCAC5
Uncertainty in the star position RA* = 6.8 mas; DEC= 6.8 mas
G magnitude 14.6
J magnitude (2MASS) 13.2

Objet

Object (471143) 2010EK139
Diameter 470.0 km
Apparent diameter 18.2 mas
Object astrometric position (ICRF) 14 00 50.5271 -39 24 59.885
Object apparent position (date) 14 01 57.3946 -39 30 07.746
Uncertainty in position RA* = 60.7mas DEC = 50.3mas
Apparent magnitude 19.7
Ephemeris NIMAv4
Dynamic class(1) res 2:7
Semi major axis(1) 70.5 au
Eccentricity(1) 0.538
Inclination(1) 29.4°
Perihelion(1) 32.6 au
Aphelion(1) 108.4 au
(1) Data from the johnston archive list.

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