Occultation by Salacia (2018-12-27)
This occultation has a more recent update available here
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 J* are the G (from Gaia) and J (from 2MASS) 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 03:51:47 |
| Star position (ICRF) | 23 24 24.9266 +22 06 09.453 |
| C/A | 0.294 arcsec |
| P/A | 36.18 ° |
| velocity | 13.50 km/s |
| Geocentric distance Δ | 44.8795 au |
| G mag* | 15.5 |
| J mag* | 14.6 |
| Magnitude drop | 4.8 |
| Uncertainty in time | 277.2 sec |
| Uncertainty in C/A | 129.5 mas |
| Uncertainty in projected distance | 4214.9 km |
| Probability of occultation on centrality | 8.5% |
| 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 | 2838031547868501632 |
| Stellar catalogue | GAIADR1 |
| Star astrometric position in catalogue (ICRF) | 23 24 24.9294 +22 06 09.511 |
| Star astrometric position with proper motion (ICRF) | 23 24 24.9266 +22 06 09.453 |
| Star apparent position (date) | 23 25 20.6197 +22 12 27.262 |
| Proper motion | μRA* = (-10.0 ± 5.0)mas; μDEC = (-14.4 ± 5.1) mas |
| Source of proper motion | UCAC5 |
| Uncertainty in the star position | RA* = 19.9 mas; DEC= 20.3 mas |
| G magnitude | 16.0 |
| J magnitude (2MASS) | 15.0 |
Objet
| Object | (120347) Salacia |
| Diameter | 901.0 km |
| Apparent diameter | 27.7 mas |
| Object astrometric position (ICRF) | 23 24 24.9391 +22 06 09.691 |
| Object apparent position (date) | 23 25 20.6322 +22 12 27.499 |
| 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 |
(1) Data from the johnston archive list.