Frederic Vachier ' web page

Tuesday 16th of May 2017 ~ 19:42:23 UTC (45) Eugenia occult 4UC 551-027325(mag 12.4)

Download the Google Earth File KMZ
green line is the central line of (45) Eugenia
blue lines show the estimate size of (45) Eugenia
red lines the 1-sigma error for the path
white lines show Petit-Prince

Event

Max duration : 4.8 seconds
Mag drop : 1.3
Shadow velocity : 38.5 km/s
Ingress Earth : 2017-05-16 19h40
Egress Earth : 2017-05-16 19h45
Moon illumination : 71%
Moon phase : Last quarter

Asteroidal system

Name : (45) Eugenia
Mag : 13.3
Asteroid Diameter : 184 km
Geocentric distance : 3.526 AU
Number of satellite : 2

Satellite : Petit-Prince
Diameter : 7 km
Max duration : 0.2 sec

Satellite : Petite-Princesse
Diameter : 5 km
Max duration : 0.1 sec

Occulted Star

Name : 4UC 551-027325
Used RA : 06:28:56.0397 J2000
Used DEC : +20:01:48.818 J2000
Mv : 12.4
VizieR - Aladin

Historic

2016-07-11 : Create prediction

Prediction for (45) Eugenia and Petit-Prince (wide views)

Eugenia

Petit-Prince

Petite-Princesse

Ephemerides from IMCCE

Ephemeris for (45) Eugenia

Ephemeris for Petit-Prince

Ephemeris from Miriade for the date of occultation and geocenter frame. For more specific ephemeris please use the documentation of Miriade.

Orbitography for the (45) Eugenia system

Petit-Prince

Astrometric observations centered on (45) Eugenia.
Dot represents one observed position. The vector shows ephemeris position from observed position.

Petit-Prince

Geometry of orbit for the (45) Eugenia system view from Earth

Cyan circle show the position of the satellite Petit-Prince at the occultation date.

The black dots show next positions during almost a period

In the center, (45) Eugenia represented by an ellipsoid

Petite-Princesse

Astrometric observations centered on (45) Eugenia.
Dot represents one observed position. The vector shows ephemeris position from observed position.

Petite-Princesse

Geometry of orbit for the (45) Eugenia system view from Earth

Cyan circle show the position of the satellite Petite-Princesse at the occultation date.

The black dots show next positions during almost a period

In the center, (45) Eugenia represented by an ellipsoid

Propagation of the solutions

We use all orbits from 1,2 and 3 sigma issued from Genetical algorithm, and we see where the satellite is for the occultation date. North on top, and East on right.

Center at coordinates 0,0 is Primary
Black dots show the orbit with the best solution at the date of occultation
Green zone show orbits covering 1-sigma error
Blue zone for 2-sigma
Red zone for 3-sigma

Petit-Prince

This figure represent 2073182 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :

1-σ error = 131 km
2-σ error = 137 km
3-σ error = 153 km

Petite-Princesse

This figure represent 2059291 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :

1-σ error = 223 km
2-σ error = 240 km
3-σ error = 297 km

Contents

Orbital solution fitted by Genoid project (Vachier F., Berthier J., Carry B. & Pajuelo M.) IMCCE/CNRS
Ephemeris has made available with Miriade Project (Berthier J. & Vachier F.) IMCCE/CNRS
Occultation Prediction by Vachier F. using Occult (Occultation Prediction Software by D.Herald)
Ephemeris and offset based on ASTORB (Edward Bowell)