J/A+A/570/A86 Pluto astrometry from 19yrs observations (Benedetti-Rossi+, 2014)
Pluto: improved astrometry from 19 years of observations.
Benedetti-Rossi G., Vieira-Martins, R., Camargo J.I.B., Assafin M.,
Braga-Ribas F.
<Astron. Astrophys. 570, A86 (2014)>
=2014A&A...570A..86B 2014A&A...570A..86B
ADC_Keywords: Minor planets ; Positional data ; Photometry, RI
Keywords: planets and satellites: individual: Pluto - atmospheric effects -
methods: data analysis - methods: analytical - methods: numerical -
astrometry
Abstract:
We present astrometric positions of Pluto, consistent with the
International Celestial Reference System, from 4412 CCD frames
observed over 120 nights with three telescopes at the Observatorio do
Pico dos Dias in Brazil, covering a time span from 1995 to 2013, and
also 145 frames observed over 11 nights in 2007 and 2009 with the
ESO/MPG 2.2m telescope equipped with the Wide Field Imager (WFI).
Our aim is to contribute to the study and improvement of the orbit of
Pluto with new astrometric methods and positions.
Description:
Pluto's astrometric positions corrected for chromatic refraction and
for photocenter offset caused by Charon.
The table lists the Julian date of the observations (UTC), the right
ascension and declination corrected for differential chromatic
refraction and photocenter offset, the total position errors, the
observed magnitude, the filter, the photocenter offsets in right
ascension and declination, telescope used, and seeing. To retrieve the
mixed positions of Pluto and Charon, corrected by differential
chromatic refraction only, one should subtract the furnished
photocenter offsets from the listed final positions. Observed
magnitudes were computed from PSF fits with respect to the UCAC4, with
errors of about 0.1 to 0.3 magnitudes. The position errors listed in
the table were computed with the square root of the sum of squares of
1) the standard deviation of the ephemeris offset nightly averages, 2)
the error from the (x,y) measurements, computed from the Gaussian fits
to the image profiles of Pluto/Charon, and 3) the value of 0.02, which
accounts for systematic effects in UCAC4.
The designation of the filters are V, R, I, and C for clear (no
filter). We note that R filters used at the OPD and the 2p2 telescopes
are in different systems. The telescopes are identified as
Z = Zeiss (60cm), B = Boller & Chivens (60cm),
P = Perkin-Elmer (160cm), and M = ESO/WFI (220cm) (see also telescope
details in Sect. 2 from paper). Seeing refers to the average full
width at half maximum (FWHM) of the stars on each frame. On the paper,
we sampled a few of the early and last observed positions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 95 4557 Pluto's final astrometric positions
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See also:
VI/88 : Ephemerides of Pluto (PLUTO95) (Chapront+ 1995)
J/A+AS/118/105 : Pluto 1991-1994 observations (Ryl'kov+, 1996)
J/A+A/383/1054 : Astrometry of Pluto and Saturn in 1995-2001 (Rapaport+, 2002)
J/A+A/486/613 : Observation of Pluto (Veiga+, 2008)
J/A+A/515/A32 : Pluto, Charon, Nix, Hydra occultations 2008-15 (Assafin+ 2010)
J/A+A/553/A14 : Pluto's observations between 1997 and 2010 (Beauvalet+, 2013)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d Epoch Epoch of observation (Julian Date)
19- 20 I2 h RAh Pluto observed Right Ascension (J2000)
22- 23 I2 min RAm Pluto observed Right Ascension (J2000)
25- 31 F7.4 s RAs Pluto observed Right Ascension (J2000)
33 A1 --- DE- Pluto observed Declination sign (J2000)
34- 35 I2 deg DEd Pluto observed Declination (J2000)
37- 38 I2 arcmin DEm Pluto observed Declination (J2000)
40- 45 F6.3 arcsec DEs Pluto observed Declination (J2000)
48- 52 F5.3 arcsec e_RAs rms uncertainty in RA
54- 58 F5.3 arcsec e_DEs rms uncertainty in DE
61- 66 F6.3 mag Rmag Observed Pluto magnitude in R band
68 A1 --- Filt [CIRV] Filter used on the observation (1)
71- 76 F6.3 arcsec oRA [-0.2/0.2] Photocenter offset in Right Ascension
78- 83 F6.3 arcsec oDE [-0.2/0.4] Photocenter offset in Declination
87 A1 --- Tel [BMPZ] Telescope used on observation (2)
91- 95 F5.3 arcsec See [0.6/5] Average FWHM of the seeing disk of
the stars on the field
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Note (1): Band pass filters used on
* OPD (Obs. Pico dos Dias, Brazil): V, R, I, and C for clear (no filter);
* ESO: filter number 844, λcentral=651.725nm, FWHM=162.184nm
Note (2): Telescopes used:
Z = Zeiss (60cm)
B = Boller & Chivens (60cm)
P = Perkin-Elmer (160cm)
M = ESO/WFI (220cm)
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Acknowledgements:
Gustavo Benedetti-Rossi, gustavorossi(at)on.br
Julio Camargo, camargo(at)on.br
(End) G. Benedetti-Rossi [Observatorio Nacional], E. Perret [CDS] 20-Aug-2014