2019A&A...625A..43D


Query : 2019A&A...625A..43D

2019A&A...625A..43D - Astronomy and Astrophysics, volume 625A, 43-43 (2019/5-1)

Pluto's ephemeris from ground-based stellar occultations (1988-2016).

DESMARS J., MEZA E., SICARDY B., ASSAFIN M., CAMARGO J.I.B., BRAGA-RIBAS F., BENEDETTI-ROSSI G., DIAS-OLIVEIRA A., MORGADO B., GOMES-JUNIOR A.R., VIEIRA-MARTINS R., BEHREND R., ORTIZ J.L., DUFFARD R., MORALES N. and SANTOS SANZ P.

Abstract (from CDS):


Context. From 1988 to 2016, several stellar occultations have been observed to characterise Pluto's atmosphere and its evolution. From each stellar occultation, an accurate astrometric position of Pluto at the observation epoch is derived. These positions mainly depend on the position of the occulted star and the precision of the timing.
Aims. We present 19 Pluto's astrometric positions derived from occultations from 1988 to 2016. Using Gaia DR2 for the positions of the occulted stars, the accuracy of these positions is estimated at 2-10 mas, depending on the observation circumstances. From these astrometric positions, we derive an updated ephemeris of Pluto's system barycentre using the NIMA code.
Methods. The astrometric positions were derived by fitting the light curves of the occultation by a model of Pluto's atmosphere. The fits provide the observed position of the centre for a reference star position. In most cases other publications provided the circumstances of the occultation such as the coordinates of the stations, timing, and impact parameter, i.e. the closest distance between the station and centre of the shadow. From these parameters, we used a procedure based on the Bessel method to derive an astrometric position.
Results. We derive accurate Pluto's astrometric positions from 1988 to 2016. These positions are used to refine the orbit of Pluto'system barycentre providing an ephemeris, accurate to the milliarcsecond level, over the period 2000-2020, allowing for better predictions for future stellar occultations.

Abstract Copyright: © J. Desmars et al. 2019

Journal keyword(s): astrometry - celestial mechanics - ephemerides - occultations - Kuiper belt objects: individual: Pluto

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Gaia DR3 3652000074629749376 PM* 14 52 09.9240926616 +00 45 02.900950200           ~ 1 0
2 Gaia DR3 4333042833914281856 * 16 58 49.4303238096 -12 51 31.840392060           ~ 1 0
3 Gaia DR3 4333071455580364160 * 17 00 18.0290372520 -12 41 42.009939384           ~ 1 0
4 UCAC2 26039859 * 17 41 12.0764553288 -15 41 34.444131432       15.00   ~ 2 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13108 0
6 Gaia DR3 4147858103406546048 * 17 50 20.7474576576 -16 22 42.210903900           ~ 1 0
7 Gaia DR3 4144912550502784384 * 17 55 05.7003791544 -16 28 34.321142856           ~ 1 0
8 USNO-B1.0 0729-00691269 * 17 58 22.3898552616 -17 02 49.351378092       15.8   ~ 2 0
9 UCAC4 365-116270 * 17 58 33.0133106760 -17 02 38.363413056       12.499   ~ 1 0
10 Gaia DR3 4096389556186605568 * 18 18 47.9296893408 -18 12 51.823665360           ~ 1 0
11 TYC 6269-554-1 * 18 19 14.3791507032 -18 16 42.319696404   12.01 10.91     ~ 1 0
12 UCAC2 24677089 * 18 25 55.4787378000 -18 48 07.045251480       14.43   ~ 2 0
13 Gaia DR3 4093175335706340480 * 18 27 53.8227167640 -18 45 30.800930544           ~ 1 0
14 Gaia DR3 4092849712861519360 * 18 32 14.6737469088 -19 24 19.349169120           ~ 1 0
15 Gaia DR3 4086200313156846336 * 18 47 52.5325213440 -19 41 24.256456944           ~ 1 0
16 Gaia DR3 4085914745029913216 * 18 49 26.5161930192 -20 22 36.936033312           ~ 1 0
17 Gaia DR3 4085914882468876672 * 18 49 31.7427712536 -20 22 23.752207524           ~ 1 0
18 UCAC4 347-165728 * 19 00 49.4763263136 -20 41 40.620739668   12.761 12.084 12.117   ~ 1 0
19 UCAC4 345-180315 * 19 07 22.1224053816 -21 10 28.345342332   16.050 14.499 14.168   ~ 1 0

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2022.08.19-04:12:14

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