J/AJ/160/73 R- and I-band photometry of 506 asteroids with CNEOST (Yeh+, 2020)
The asteroid rotation period survey using the China Near-Earth Object Survey
Telescope (CNEOST).
Yeh T.-S., Li B., Chang C.-K., Zhao H.-B., Ji J.-H., Lin Z.-Y., Ip W.-H.
<Astron. J., 160, 73 (2020)>
=2020AJ....160...73Y 2020AJ....160...73Y
ADC_Keywords: Minor planets; Photometry, RI
Keywords: Asteroids ; Period determination
Abstract:
We initiated the bilateral collaboration between the Lulin Observatory
and the Purple Mountain Observatory to collect asteroid lightcurves
using the Chinese Near-Earth Object Survey Telescope at the Xuyi
Observation Station. The primary goal of this collaboration was to
discover super-fast rotators (SFRs) and study their physical
properties. Two campaigns have been conducted: (a) a survey of
∼45°2 using 8minute cadence during 2017 February 26-March 2, and
(b) a survey of ∼60°2 using 10minute cadence during 2018 March
9-12. Our samples are mainly main-belt asteroids and some Hildas and
Jupiter Trojans. Out of 4522 collected lightcurves, 506 reliable
rotation periods were obtained. Among the reliable rotation periods,
we found 16 candidates with a possible rotation period of <2.2hr, in
which (134291) 2006 DZ6 shows a very convincing folded lightcurve and
the other 15 candidates only have a likely trend. Further confirmation
is needed for the rotation periods of these SFR candidates. In
addition, (2280) Kunikov seems to have an eclipsing feature on its
lightcurve with a relatively long rotation period suggesting that it
is likely a fully synchronized binary asteroid. When the preliminary
spin-rate distributions were carried out for asteroids using different
sizes, no obvious difference was found.
Description:
We used the China Near-Earth Object Survey Telescope (CNEOST) to
conduct the survey. The CNEOST is a 1.2m telescope located at the XuYi
station. Two surveys were conducted, using 90s exposures.
The first survey was carried in 2017 February 26 to March 2, which
covered a total survey area of ∼45°2 close to the ecliptic
plane. We continuously scanned on four main fields in a cadence of
∼8minutes using the R band for the first four nights and another
additional field was added in the last night for the follow-up
observation of near-Earth asteroids of the other proposal.
The second survey was conducted in 2018 March 8, 9, 11, and 12, which
had a total survey area of ∼60°2. In this survey, six fields were
repeatedly observed in a cadence of ∼10 minutes using the I-band and,
moreover, an extra field was added in the last two nights to follow up
other targets of another proposal.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 67 196 List of U=3 asteroids
table6.dat 67 310 List of U=2 asteroids
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
J/A+A/527/A42 : Photometry of asteroid (21) Lutetia (de Leon+, 2011)
J/A+A/546/A86 : R absolute magnitudes of Kuiper Belt objects (Peixinho+, 2012)
J/A+A/556/A8 : 100 asteroids rotational parameters (Lhotka+, 2013)
J/A+A/561/A45 : Asteroid (341843) 2008 EV5 WISE light curves (Ali-Lagoa+, 2014)
J/A+A/562/A48 : Light curves of asteroid (25143) Itokawa (Lowry+, 2014)
J/ApJ/793/50 : Observed light curve of (3200) Phaethon (Ansdell+, 2014)
J/ApJS/219/27 : Surveys of asteroid rotation periods using iPTF (Chang+, 2015)
J/ApJS/227/20 : Rotation periods of asteroids using iPTF (Chang+, 2016)
J/A+A/617/A12 : Taxonomic classification of asteroids (Popescu+, 2018)
J/A+A/627/A172 : Near-Earth asteroid (1917) Cuyo opt. & IR obs. (Rozek+, 2019)
J/ApJS/241/6 : Searching for super-fast rotators using PS1 (Chang+, 2019)
J/AJ/159/25 : PS1 light curves & rotation periods of new asteroids (Lo+,2020)
J/A+A/635/A54 : SBNAF Infrared Database (Szakats, 2020)
J/ApJS/247/13 : ATLAS c-o colors & classification of asteroids (Erasmus+, 2020)
http://www.minorplanet.info/lightcurvedatabase.html: Lightcurve database
Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Planet Asteroid number
8- 21 A14 --- Name Asteroid designation
23- 27 F5.1 km Diameter Estimated diameter
29- 33 F5.2 h Per Derived rotation period
35- 38 F4.2 h e_Per Uncertainty in Period
40- 44 F5.2 mag MAG Absolute magnitude in Filter
46 A1 --- Filter Filter used (I or R)
48- 52 F5.2 mag mag Apparent magnitude in Filter
54- 57 F4.2 mag A Lightcurve amplitude
59- 62 F4.2 AU MajAxis Orbital semi-major axis
64- 67 F4.1 deg Angle Phase angle
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 19-Oct-2020