Occultation by Salacia (2018-12-27)
Occultation map

Information about the map:
- The straight and continue lines are the shadow limits considering the estimated radius; when the shadow crosses the Earth's surface, the path is projected on the Earth;
- Each blue dot is spaced by one minute and the big blue dot corresponds to the nominal occultation time (which is the geocentric closest approach);
- The arrow shows the direction of the shadow motion;
- The 1-σ precision along the path is represented by the red dotted line;
- The star G* and RP* are the G (from Gaia) and RP (red photometer from GaiaDR2) magnitudes, normalized to a body moving at 20km/s in order to enhance very slow events;
- The body offset is at the upper right corner, if JPL ephemeris is used;
- Areas in dark grey correspond to full night (Sun elevation below -18 degrees) and areas in light grey correspond to twilight (Sun elevation between -18 and 0 degrees) while daytime is in white;
- Be careful, the dates are from the moment of the event in Universal Time, the night of the event may begin at the date before.
Occultation circumstances
| Date |
Thu. 27 Dec. 2018 03:51:44 |
| Star position (ICRF) |
23 24 24.9286 +22 06 09.494 |
| C/A |
0.245 arcsec |
| P/A |
36.20 ° |
| velocity |
13.50 km/s |
| Geocentric distance Δ |
44.8795 au |
| G mag* |
15.6 |
| RP mag* | 15.1 |
| Magnitude drop |
4.7 |
| Uncertainty in time |
273.7 sec |
| Uncertainty in C/A |
128.0 mas |
| Uncertainty in projected distance |
4168.0 km |
| Probability of occultation on centrality |
8.6% |
| Maximum duration |
66.7 sec |
| Moon distance to the object |
143.4° |
| Fraction of illuminated Moon |
74.5 % |
| Solar elongation |
86.4° |
Occulted star
| Star source ID |
2838031552164423424 |
| Stellar catalogue |
GAIADR2 |
| Star astrometric position in catalogue (ICRF) |
23 24 24.9293 +22 06 09.508 |
| Star astrometric position with proper motion (ICRF) |
23 24 24.9286 +22 06 09.494 |
| Star apparent position (date) |
23 25 20.6217 +22 12 27.302 |
| Proper motion |
μRA* = (-2.8 ± 0.1)mas; μDEC = (-4.1 ± 0.1) mas |
| Source of proper motion |
GAIADR2 |
| Uncertainty in the star position |
RA* = 0.3 mas; DEC= 0.2 mas |
| G magnitude |
16.1 |
| RP magnitude (GaiaDR2) | 15.5 |
Objet
| Object |
(120347) Salacia |
| Diameter |
901.0 km |
| Apparent diameter |
27.7 mas |
| Object astrometric position (ICRF) |
23 24 24.9390 +22 06 09.691 |
| Object apparent position (date) |
23 25 20.6321 +22 12 27.500 |
| Uncertainty in position |
RA* = 133.8mas DEC = 106.7mas |
| Apparent magnitude |
20.8 |
| Ephemeris |
NIMAv3 |
| Dynamic class(1) |
cubewano? |
| Semi major axis(1) |
41.9 au |
| Eccentricity(1) |
0.11 |
| Inclination(1) |
23.9° |
| Perihelion(1) |
37.3 au |
| Aphelion(1) |
46.5 au |
Sky map (Aladin)
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