Occultation by (4337) Arecibo, 2024-09-14
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Occultation map
(*) The blue dots are separated by a one-minute interval and the big blue dot corresponds to the nominal occultation time (which is the geocentric closest approach).
Occultation circumstances
Occultation event id | 20734 |
Date at closest approach | Sat. 14 Sep. 2024 09:17:23 |
Star position (ICRF) | 07 00 15.6889 +24 13 20.423 |
C/A | 1.049 arcsec |
P/A | 3.82 ° |
velocity | 25.71 km/s |
Geocentric distance Δ | 3.7438 au |
Star G magnitude | 10.8 |
Magnitude drop | 8.1 |
Max occultation duration (main body) | 0.8 sec |
Moon distance to the object | 162.9° |
Fraction of illuminated Moon | 81.3 % |
Solar elongation | 68.0° |
Prediction source | JPL56 |
Star & Object data
Occulted star
Star source ID | 3380619340513448448 |
Stellar catalogue | GaiaDR3 |
Star astrometric position in catalogue (ICRF) | 07 00 15.6885 +24 13 20.434 |
Star astrometric position with proper motion (ICRF) | 07 00 15.6889 +24 13 20.423 |
Star apparent position (date) | 07 01 45.3761 +24 11 19.816 |
Proper motion | μRA* = (0.5 ± 0.0)mas/yr; μDEC = (-1.3 ± 0.0) mas/yr |
Source of proper motion | GaiaDR3 |
Uncertainty in the star position | RA* = 0.1 mas; DEC= 0.1 mas |
G mag* | 11.1 |
J mag* | 10.2 |
H mag* | 8.2 |
RP magnitude (source: GaiaDR3) | 9.9 |
BP magnitude (source: GaiaDR3) | 11.6 |
J magnitude (source: 2MASS) | 8.7 |
H magnitude (source: 2MASS) | 7.9 |
K magnitude (source: 2MASS) | 7.8 |
RUWE (source: Gaia) | 0.96 |
Main Object
(ID) Object | Arecibo |
Diameter | 24.4 km |
Uncertainty in diameter | 0.60 km |
Apparent diameter | 7.3 mas |
Semi-major Axis | 3.27 au |
Object astrometric position (ICRF) | 07 00 15.6937 +24 13 21.469 |
Object apparent position (date) | 07 01 45.3812 +24 11 20.862 |
Apparent magnitude | 18.9 |
Binary system characteristics (satellite)
Measure(1) #1 | |
Estimated separation 1 | 63.01 km |
Uncertainty in separation 1 | 9.29 km |
Estimated separation 2 | - |
Uncertainty in separation 2 | - |
Diameter (sol° 1) | 2.64 km |
Uncertainty in diameter (sol° 1) | 0.04 km |
Max occultation duration (sol° 1) | 0.08 s |
Diameter (sol° 2) | 18.47 km |
Uncertainty in diameter (sol° 2) | 0.39 km |
Max occultation duration (sol° 2) | 0.58 s |
p-value | 1.44 % |
Quality factor | 0.98 |
SNR flag | 0 |
(1) Some asteroids may have differents measures concerning their binary characteristics, they are summed up here.
Sky map (Aladin)
link to sky-map
For declination above -25 °, Pan-STARRS survey is displayed by default whereas below -25 °, DSS is displayed.
For declination above -25 °, Pan-STARRS survey is displayed by default whereas below -25 °, DSS is displayed.
Interactive Map
Observation advice
To be able to observe the asteroid satellite, we recommend, if the satellite is in the path of the primary body, that you start recording your observations preferentially around 1min beforehand.
Interactive map legend
The large blue line represents the centrality of the nominal prediction. The thin dotted blue lines represent the body's limits of the nominal prediction. Red lines show the region where the satellite can be. The white area represents the daylight part on Earth and the blue area represents the region on Earth where the object is not visible. The shadow at nominal time is displayed, the brighter part represents the uncertainty in the body's radius. The Sun symbol indicates the place where the Sun is at the zenith at the nominal time. The star symbol indicates the place where the occulted star is at the zenith at the nominal time. Grey zone represents the night area.
By clicking on one place, you will have an infobox with :
To be able to observe the asteroid satellite, we recommend, if the satellite is in the path of the primary body, that you start recording your observations preferentially around 1min beforehand.
Interactive map legend
The large blue line represents the centrality of the nominal prediction. The thin dotted blue lines represent the body's limits of the nominal prediction. Red lines show the region where the satellite can be. The white area represents the daylight part on Earth and the blue area represents the region on Earth where the object is not visible. The shadow at nominal time is displayed, the brighter part represents the uncertainty in the body's radius. The Sun symbol indicates the place where the Sun is at the zenith at the nominal time. The star symbol indicates the place where the occulted star is at the zenith at the nominal time. Grey zone represents the night area.
By clicking on one place, you will have an infobox with :
- Coordinates: Longitude and latitude;
- ρ and Δd: Impact parameter (i.e. projected distance to the central line) and σ distance; Δd is (ρ-r)/σd where r is the object radius and σd is the uncertainty in distance;
- Mid time: Mid time of the occultation at the selected place;
- Expected duration (main body): Expected duration of the occultation of the main body at the selected place;
- Max expected duration (satellite): Expected maximum duration of the occultation of the satellite at the selected place, the two values corresponds to the two possibles solutions for the satellite diameter;
- Object elevation: Object's elevation above the horizon at the selected place at the mid time;
- Sun and Moon elevation: Sun's and Moon's elevation above the horizon at the selected place at the mid time;
Previous updates
- 2023-Jul-25 19:18 : JPL49, GaiaDR3, GaiaDR3