Occultation by Bienor (2018-04-02)


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Occultation circumstances

Date Mon. 2 Apr. 2018 19:47:57
Star position (ICRF) 03 00 51.8175 +37 21 59.436
C/A 0.362 arcsec
P/A 354.00 °
velocity 30.59 km/s
Geocentric distance Δ 15.6765 au
G mag* 15.0
J mag* 13.6
Magnitude drop 5.2
Uncertainty in time 7.2 sec
Uncertainty in C/A 16.1 mas
Uncertainty in projected distance 183.4 km
Probability of occultation on centrality 39.2%
Maximum duration 6.1 sec
Moon distance to the object 152.6°
Fraction of illuminated Moon 93.9 %
Solar elongation 44.8°

Occulted star

Star source ID 142106792650205696
Stellar catalogue GAIADR1
Star astrometric position in catalogue (ICRF) 03 00 51.8177 +37 21 59.442
Star astrometric position with proper motion (ICRF) 03 00 51.8175 +37 21 59.436
Star apparent position (date) 03 01 59.0448 +37 26 08.481
Proper motion μRA* = (-0.7 ± 1.8)mas; μDEC = (-1.8 ± 1.8) mas
Source of proper motion UCAC5
Uncertainty in the star position RA* = 5.9 mas; DEC= 5.9 mas
G magnitude 14.5
J magnitude (2MASS) 13.1

Objet

Object (54598) Bienor
Diameter 188.0 km
Apparent diameter 16.5 mas
Object astrometric position (ICRF) 03 00 51.8143 +37 21 59.796
Object apparent position (date) 03 01 59.0416 +37 26 08.841
Uncertainty in position RA* = 19.0mas DEC = 15.1mas
Apparent magnitude 19.7
Ephemeris NIMAv12
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.

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