J/A+A/643/A125 (174567) Varda multi-chord stellar occultation (Souami+, 2020)
A multi-chord stellar occultation by the large trans-Neptunian object
(174567) Varda.
Souami D., Braga-Ribas F., Sicardy B., Morgado B., Ortiz J.L., Desmars J.,
Camargo J.I.B., Vachier F., Berthier J., Carry B., Anderson C.J.,
Showers R., Thomason K., Maley P.D., Thomas W., Buie M.W., Leiva R.,
Keller J.M., Vieira-Martins R., Assafin M. Santos-Sanz P., Morales N.,
Duffard R., Benedetti-Rossi G., Gomes-Junior A.R., Boufleur R.,
Pereira C.L., Margoti G., Pavlov H., George T., Oesper D., Bardecker J.,
Dunford R., Kehrli M., Spencer C., Cota J.M., Garcia M., Lara C.,
McCandless K.A., Self E., Lecacheux J., Frappa E., Dunham D., Emilio M.
<Astron. Astrophys. 643, A125 (2020)>
=2020A&A...643A.125S 2020A&A...643A.125S (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets
Keywords: methods: observational - occultations -
Kuiper belt objects, individual: Varda
Abstract:
We present here results of the first-ever recorded stellar occultation
by the large trans-Neptunian object (174567) Varda that was observed
on September 10th, 2018.
Varda belongs to the high-inclination dynamically excited population,
and has a satellite, Ilmare, which is half the size of Varda.
Description:
In table A1, we give astrometric observations of the trans-Neptunian
(174567) Varda that were performed by our group using several
telescopes between April 2013 and July 2019.
The columns give observation date (year, month, day), the measured RA
and DEC (in degrees), the IAU code of the observation site, and the
reference catalogue used for the reduction.
In fig3b.dat, we give the data associated with figure 3b. We give here
the occultation light-curves from five stations (TWF, MHV, YMA, CAR
and FLO).
The first column gives station code, the second column the time in
seconds after midnight (UTC) on the day of the occultation. The third
column gives the normalised between 0 (Varda flux) and 1 (fluxes of
the unocculted star and of Varda).
objects:
-------------------------------------------------------------------
Planet Name H Diam i e a
mag km deg AU
-------------------------------------------------------------------
174567 Varda 3.40 --- 21.513359 0.14361777 46.09048940
-------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
astrom.dat 52 118 Astrometric observations
fig3b.dat 34 1594 Data associated with figure 3b
--------------------------------------------------------------------------------
Byte-by-byte Description of file: astrom.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 "datime" Obs.date UTC instant of the observation
20- 31 F12.8 deg RAdeg Right ascension (J2000) of Varda at epoch
of observation
34- 44 F11.8 deg DEdeg Declination (J2000) of Varda at epoch
of observation
47- 49 A3 --- ObsCode Observing site IAU code (1)
52 A1 --- Catalog Astrometric catalogue (MPC code) (2)
--------------------------------------------------------------------------------
Note (1): IAU codes are as follows:
(809) European Southern Observatory, La Silla, Chile;
(874) Observatorio do Pico dos Dias, Itajuba, Brazil;
(J86) Sierra Nevada Observatory, Spain.
Note (2): the following MPC codes q, U, and V mean that UCAC-4, Gaia-DR1, and
Gaia-DR2 astrometric catalogues were used for the reduction, respectively.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig3b.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Station Station code (1)
5- 22 F18.12 s Time Time in seconds after midnight (UTC) (2)
24- 34 F11.8 --- Flux Normalised flux
--------------------------------------------------------------------------------
Note (1): Station code as follows:
--------------------------------------------------------------------
Topocentric coordinates
Site LongitudeW LatitudeW Elevation Telescope's Camera
(m) diameter (cm)
--------------------------------------------------------------------
CAR = 111 57 07.9 33 48 42.9 654 28 Watec 910HX
FLO = 111 21 00.6 33 00 54.3 484 28 Watec 120N+
MHV = 114 35 48.9 35 01 54.1 184 28 Mallincam 428
TWF = 114 28 13.1 42 35 01.9 1133 60 Watec 120N+
YMA = 114 26 10.5 32 39 34.0 97 28 Mallincam 428
--------------------------------------------------------------------
Note (2): Time is given in seconds starting after midnight (UTC) on the day of
the occultation.
--------------------------------------------------------------------------------
Acknowledgements:
Damya Souami, damya.souami(at)obspm.fr
(End) D. Souami [LESIA, Paris Obs., France], P. Vannier [CDS] 17-Aug-2020