Occultation by Pluto (2018-08-15)


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Occultation circumstances

Date Wed. 15 Aug. 2018 05:32:34
Star position (ICRF) 19 22 10.4686 -21 58 49.020
C/A 0.172 arcsec
P/A 347.11 °
velocity -19.33 km/s
Geocentric distance Δ 32.7670 au
G mag* 12.9
J mag* 11.9
Magnitude drop 1.9
Uncertainty in time -
Uncertainty in C/A -
Uncertainty in projected distance -
Probability of occultation on centrality -
Maximum duration 122.6 sec
Moon distance to the object 94.8°
Fraction of illuminated Moon 19.5 %
Solar elongation 146.6°

Occulted star

Star source ID 6772629166226301824
Stellar catalogue GAIADR1
Star astrometric position in catalogue (ICRF) 19 22 10.4672 -21 58 49.052
Star astrometric position with proper motion (ICRF) 19 22 10.4686 -21 58 49.020
Star apparent position (date) 19 23 17.3224 -21 56 32.014
Proper motion μRA* = (5.6 ± 1.6)mas; μDEC = (8.9 ± 1.9) mas
Source of proper motion UCAC5
Uncertainty in the star position RA* = 20.1 mas; DEC= 25.4 mas
G magnitude 12.9
J magnitude (2MASS) 11.9

Objet

Object (S999) Pluto
Diameter 2370.0 km
Apparent diameter 99.7 mas
Object astrometric position (ICRF) 19 22 10.4659 -21 58 48.852
Object apparent position (date) 19 23 17.3196 -21 56 31.846
Uncertainty in position -
Apparent magnitude 14.6
Ephemeris JPLDE436PLU055
Dynamic class(1) plutino
Semi major axis(1) 39.7 au
Eccentricity(1) 0.253
Inclination(1) 17.1°
Perihelion(1) 29.7 au
Aphelion(1) 49.8 au
(1) Data from the johnston archive list.

Sky map (Aladin)

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