Occultation by 2002MS4 (2018-06-12)


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Occultation circumstances

Date Tue. 12 Jun. 2018 16:33:12
Star position (ICRF) 18 42 56.5928 -06 37 08.249
C/A 0.168 arcsec
P/A 3.63 °
velocity -23.73 km/s
Geocentric distance Δ 45.7501 au
G mag* 15.4
RP mag* 14.8
Magnitude drop 5.3
Uncertainty in time 132.3 sec
Uncertainty in C/A 59.0 mas
Uncertainty in projected distance 1958.3 km
Probability of occultation on centrality 18.8%
Maximum duration 39.4 sec
Moon distance to the object 143.2°
Fraction of illuminated Moon 2.0 %
Solar elongation 154.6°

Occulted star

Star source ID 4253176718880902784
Stellar catalogue GAIADR2
Star astrometric position in catalogue (ICRF) 18 42 56.5929 -06 37 08.239
Star astrometric position with proper motion (ICRF) 18 42 56.5928 -06 37 08.249
Star apparent position (date) 18 43 56.4709 -06 35 53.957
Proper motion μRA* = (-0.4 ± 0.1)mas; μDEC = (-3.4 ± 0.1) mas
Source of proper motion GAIADR2
Uncertainty in the star position RA* = 0.3 mas; DEC= 0.2 mas
G magnitude 15.2
RP magnitude (GaiaDR2) 14.6

Objet

Object (307261) 2002MS4
Diameter 934.0 km
Apparent diameter 28.1 mas
Object astrometric position (ICRF) 18 42 56.5936 -06 37 08.081
Object apparent position (date) 18 43 56.4716 -06 35 53.789
Uncertainty in position RA* = 95.5mas DEC = 57.6mas
Apparent magnitude 20.4
Ephemeris NIMAv3
Dynamic class(1) cubewano?
Semi major axis(1) 41.9 au
Eccentricity(1) 0.141
Inclination(1) 17.7°
Perihelion(1) 36.0 au
Aphelion(1) 47.8 au
(1) Data from the johnston archive list.

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