J/other/PSS/134.96 2007-2016 Pulkovo Uranian satellites obs. (Ershova+, 2017)
Astrometric observations of the main Uranian satellites at the Pulkovo
Observatory in 2007-2016.
Ershova A.P., Roshchina E.A., Izmailov I.S.
<Planetary and Space Science, 134, 96-99>
=2017P&SS..134...96E 2017P&SS..134...96E (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Positional data
Keywords: CCD astrometry - Uranian satellites -
planets and satellites: individual: Ariel, Umbriel, Titania, Oberon
Abstract:
We present the results of the observations of the Uranian satellites
made with the 26-inch refractor at the Pulkovo Observatory in
2007-2016. During this time we got 17 normal positions of Ariel, 43
normal positions of Umbriel, 112 normal positions of Titania and 122
normal positions of Oberon. The observations were performed every year
from the end of august to the beginning of January. Our results show a
good quality of contemporary theories of Uranian satellites' and
planets' motion. Published positions of the Uranian satellites can
be useful for construction of future theories. Almost 7000 CCD frames
were analyzed and reduced using the UCAC4 catalog. Observation
processing and coordinate measurement were performed with the IZMCCD
software package (izmccd.puldb.ru). Special approach was used to
eliminate a scattered halo caused by the bright planet.
Description:
Observations of the main Uranian satellites were made with the 26-inch
refractor (D/F=65cm/1041.3cm) at the Pulkovo Observatory in 2007-2016.
The CCD camera FLI Pro Line was used (3056x3056px, each pixel of
12-microns). The field of view -- 12'x12', focal plane scale --
19.8"/mm, scale on the CCD frames -- 0.24"/px.
The UCAC4 catalog was used as a reference. Coordinates' epoch is the
J2000.0.
Average values of Standart Error of the Mean (SEM) of RA and DEC for
each satellite are shown in table below.
Satellite RA_SEM DEC_SEM
------------------------------------------------
Ariel (U1) 0.06" 0.06"
Umbriel (U2) 0.05" 0.07"
Titania (U3) 0.02" 0.02"
Oberon (U4) 0.02" 0.02"
------------------------------------------------
Coordinates with their errors are shown in the "obsperr.dat" file. The
"obs.dat" file was made according to MPC format and contains data in
the same order as "obsperr.dat". Both files contain date of
observation and satellite index so sit is easy to compare strings.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
obs.dat 57 301 Data in MPC-like format
obsperr.dat 81 301 Same data as in ob.sdat file with corresponding
errors of coordinates
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See also:
http://www.puldb.ru/db/sdb.php : Pulkovo Database of Observations of Planets
and Their Satellites
Byte-by-byte Description of file: obs.dat obsperr.dat
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Bytes Format Units Label Explanations
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1 A1 --- Planet [U] Planet identifier
2 I1 --- Sat [1/4] Satellite number
4 A1 --- S [S]
6 A1 --- N1 [H] label H for hand measurement of CCD image
7 A1 --- N2 [C] label C for CCD
9- 28 A20 "date" Obs.date Date of observation (YYYY/MM/DD.ddddd)
29- 30 I2 h RAh Right ascension (J2000)
32- 33 I2 min RAm Right ascension (J2000)
35- 41 F7.4 s RAs Right ascension (J2000)
42 A1 --- DE- Declination sign (J2000)
43 I1 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 53 F6.3 arcsec DEs Declination (J2000)
55- 57 I3 --- Obscode Observatoy's code
59- 63 F5.3 arcsec s_RAs ? Root mean square (RMS) of RA
65- 69 F5.3 arcsec s_DEs ? Root mean square (RMS) of DE
71- 75 F5.3 arcsec e_RAs ? Standart error (SEM) of RA
77- 81 F5.3 arcsec e_DEs ? Standart error (SEM) of DE
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Acknowledgements:
Anastasiia Ershova, vveyzaa(at)gmail.com
(End) Patricia Vannier [CDS] 03-Nov-2016