Occultation by Bienor (2017-12-29)


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Occultation circumstances

Date Fri. 29 Dec. 2017 16:29:18
Star position (ICRF) 02 49 15.5338 +38 29 52.267
C/A 0.290 arcsec
P/A 133.28 °
velocity -14.95 km/s
Geocentric distance Δ 14.4057 au
G mag* 12.5
J mag* 11.3
Magnitude drop 6.7
Uncertainty in time 27.6 sec
Uncertainty in C/A 27.7 mas
Uncertainty in projected distance 289.2 km
Probability of occultation on centrality 25.5%
Maximum duration 12.6 sec
Moon distance to the object 26.4°
Fraction of illuminated Moon 83.4 %
Solar elongation 130.3°

Occulted star

Star source ID 141857753266874240
Stellar catalogue GAIADR1
Star astrometric position in catalogue (ICRF) 02 49 15.5340 +38 29 52.278
Star astrometric position with proper motion (ICRF) 02 49 15.5338 +38 29 52.267
Star apparent position (date) 02 50 24.2001 +38 34 19.583
Proper motion μRA* = (-1.0 ± 1.1)mas; μDEC = (-3.6 ± 1.0) mas
Source of proper motion UCAC5
Uncertainty in the star position RA* = 3.3 mas; DEC= 3.0 mas
G magnitude 12.8
J magnitude (2MASS) 11.6

Objet

Object (54598) Bienor
Diameter 188.0 km
Apparent diameter 18.0 mas
Object astrometric position (ICRF) 02 49 15.5518 +38 29 52.069
Object apparent position (date) 02 50 24.2181 +38 34 19.384
Uncertainty in position RA* = 38.8mas DEC = 28.4mas
Apparent magnitude 19.5
Ephemeris NIMAv11
Dynamic class(1) Centaur
Semi major axis(1) 16.4 au
Eccentricity(1) 0.2
Inclination(1) 20.7°
Perihelion(1) 13.2 au
Aphelion(1) 19.7 au
(1) Data from the johnston archive list.

Sky map (Aladin)

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