J/AJ/164/37 2008-2014 precise position of 5 Uranian satellites (Zhang+, 2022)
Precise Positions of Five Major Uranian Satellites During 2008-2014 Based on
Gaia EDR3.
Zhang H.Y., Qiao R.C., Yu Y., Yan D., Cheng X., Tang K., Mao Y.D.
<Astron. J., 164, 37 (2022)>
=2022AJ....164...37Z 2022AJ....164...37Z
ADC_Keywords: Solar system; Minor planets; Photometry, UVBGRI
Keywords: Uranian satellites
Abstract:
The five major Uranian satellites (Ariel, Umbriel, Titania, Oberon,
and Miranda) were observed by a 1.56m telescope at Sheshan Station of
Shanghai Astronomical Observatory during 2008-2014 and a total of 1915
positions of these five satellites were presented in this paper. Since
all five satellites are close to Uranus, their positions are affected
by the uneven background, which is caused by the halo of Uranus. The
median filtering method is used to remove the influence of the halo of
the bright Uranus, which also made the rate of target detection
increase by 30%-100%, especially for Miranda. Gaia EDR3 is used as the
reference catalog when calculating positions of the five satellites. A
comparison between our positions with the theoretical positions of the
satellites from Institut de mecanique celeste et de calcul des
ephemerides (IMCCE) is given. Such precise positions over a long time
will be very helpful to improve the orbit parameters of the five major
Uranian satellites.
Description:
When the opposition of Uranus happened in 2008-2014, the 1.56m
astrometric reflector at the Shanghai Astronomical Observatory
(N31.096°, E121.184°, H97m, IAU code 337) was used to observe
Uranus and its five major satellites between 300 and 1100nm, with a
fiels of view of 11.2'x10.8' and an angular resolution of 0.32".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 5 *Parameters of the five major satellites
table4.dat 52 1915 List of the observed positions of the five major
Uranian satellites
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Note on table1.dat : From NASA's Uranian Satellite Fact Sheet;
http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+AS/113/557 : Uranian satellites (Veiga+, 1995)
J/A+A/383/296 : Saturnian Satellites positions (1996-2000) (Peng+, 2002)
J/A+A/391/775 : Uranian satellites in 1995/97 (Shen+, 2002)
J/A+A/582/A8 : Astrometry of the main satellites of Uranus (Camargo+, 2015)
J/other/OAP/29.155 : Uranus & Neptune topocentric pos. (Yizhakevych+, 2016)
J/AJ/161/237 : Positions of Triton with Sheshan Station tel. (Zhang+, 2021)
http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html : NASA
Byte-by-byte Description of file:table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Satallite identifier
9- 10 A2 --- Sat Satellite identifier code
12- 16 F5.2 --- Mass [0.66/34.2] Mass (1020kg)
18- 22 F5.1 km Rad1 [240/789] Radius 1
24- 28 F5.1 km Rad2 [234/578]? Radius 2
30- 34 F5.1 km Rad3 [232/578]? Radius 3
36- 39 I4 kg/m3 Dens [1200/1660] Mean density
41- 44 F4.2 --- omega [0.21/0.39] Visualgeometric albedo
46- 51 F6.2 --- a [129/584] Semimajor axis (103km)
53- 58 F6.3 --- a-u [5.08/22.9] Semimajor axis (Uranian radii)
60- 68 F9.6 d Porb [1.41/13.5] Orbital period
70- 73 F4.2 deg i [0.04/4.34] Inclination
75- 80 F6.4 --- e [0.001/0.004] Eccentricity
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Sat Satellite identifier code
4- 7 I4 yr Obs.Y [2008/2014] Observation Year
9- 10 I2 "month" Obs.M Observation Month
12- 20 F9.6 d Obs.D Fractional day (UTC) in month (1)
22- 23 I2 h RAh [0/23] Hour of Right Ascension (J2000)
25- 26 I2 min RAm Minute of Right Ascension (J2000)
28- 34 F7.4 s RAs Second of Right Ascension (J2000)
36- 36 A1 --- DE- [±] Sign of the Declination (J2000)
37- 38 I2 deg DEd Degree of Declination (J2000)
40- 41 I2 arcmin DEm Arcminute of Declination (J2000)
43- 48 F6.3 arcsec DEs Arcsecond of Declination (J2000)
50- 52 I3 --- Site [337] Code of the observing site (2)
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Note (1): The decimal day corresponds to the middle time of each exposure
Note (2): IAU code 337=1.56m astrometric reflector at the Shanghai
Astronomical Observatory (N31.096d,E121.184d,H97m)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 24-Oct-2022