Neptune Occultation Campaign 2021 (NOC21)
Occultation by Neptune, Proteus and Despina (2021-10-07)
(Night of Oct. 6th to Oct. 7th)
|On October 7th 2021, Neptune, its rings and two satellites Proteus and Despina will occult a mag 14.9 star. This page presents information about this occultation.
This is not a classical campaign:
We recommend that you make some tests on the target star and evaluate the SNR, before attempting to observe the event. A relatively high SNR is needed, along with the a good time resolution. Only tests will help you find the best compromise.
We have secured time on the largest telescopes, however we thought some of you might be equipped for a such a challenging event.
Animation of the occultation (Credit: Dave Herald)
The occultation was predicted using JPL DE435 and NEP095 for Neptune and satellites ephemerides and GaiaEDR3 for star positions. Uncertainty on the star position is around 0.2mas but the uncertainty on Neptune and its satellites positions is not given.
For questions, more information or if you plan to observe these occultations, please contact noc21[dot]lesia[at]obspm[dot]fr
The following table provided the required timing recording for Neptune's atmosphere, rings and its satellites. Note that the uncertainty is unknown but is estimated to be few hundreds km for satellites, so observation outside the path are welcome.
|Neptune's atmosphere + rings||05:55 to 07:35|
|Neptune's atmosphere only||06:15 to 07:20|
|Neptune's rings only||(05:55 to 06:20) & (07:05 to 07:30)|
|Despina||07:15 to 07:30|
|Proteus||07:50 to 08:10|
By clicking on the map, you will find individual Lucky Star page with many information (including interactive map).
|Star source ID||2633285513360476416|
|Star astrometric position in catalogue (ICRF)||23 28 17.8771 -04 41 40.598|
|Star astrometric position with proper motion (ICRF)||23 28 17.8846 -04 41 40.626|
|Star apparent position (date)||23 29 25.3090 -04 34 28.295|
|Proper motion||μRA* = (19.2 ± 0.0)mas/yr; μDEC = (-4.9 ± 0.0) mas/yr|
|Source of proper motion||GaiaER3|
|Uncertainty in the star position||RA* = 0.2 mas; DEC= 0.1 mas|
|RP magnitude (source: GaiaER3)||14.3|
|BP magnitude (source: GaiaER3)||15.3|
|J magnitude (source: 2MASS)||13.6|
|H magnitude (source: 2MASS)||13.2|
|K magnitude (source: 2MASS)||13.1|
Sky map (Aladin)
For declination above -25 °, Pan-STARRS survey is displayed by default whereas below -25 °, DSS is displayed.