J/ApJS/267/33 FOSSIL. III. LCs of Trans-Neptunian Objects (Ashton+, 2023)
The high-cadence Formation of the Outer Solar System: an Icy Legacy (FOSSIL).
III. Lightcurves of 371 Trans-Neptunian Objects.
Ashton E., Chang C.-K., Chen Y.-T., Lehner M.J., Wang S.-Y.,
Alexandersen M., Choi Y.-J., Fraser W.C., Granados Contreras A.P., Ito T.,
JeongAhn Y., Ji J., Kavelaars JJ, Kim M.-J., Lawler S.M., Li J.,
Lin Z.-Y., Lykawka P.S., Moon H.-K., More S., Munoz-Gutierrez M.A.,
Ohtsuki K., Pike R.E., Terai T., Urakawa S., Yoshida F., Zhang H.,
Zhao H., Zhou J.-L., The FOSSIL Collaboration
<Astrophys. J. Suppl. Ser., 267, 33 (2023)>
=2023ApJS..267...33A 2023ApJS..267...33A
ADC_Keywords: Minor planets; Photometry; Optical; Surveys
Keywords: Trans-Neptunian objects ; Light curves ; Sky surveys
Abstract:
From the first phase of the high-cadence Formation of the Outer Solar
System: an Icy Legacy (FOSSIL) survey, we analyzed lightcurves,
ranging from one to four nights in length, of 371 trans-Neptunian
objects (TNOs) for periodicity. We found 29 TNOs with periodic
lightcurves, one of which is a good candidate for a close/contact
binary. Another of the periodic FOSSIL TNOs could potentially have the
fastest of all known TNO spin rates, with a period of 1.3hr. We do
not have total confidence in the period and thus plan to obtain a more
detailed lightcurve for confirmation. The periodic TNOs have an
average rotation period of 11.2hr, close to the value obtained by
Alexandersen+ (2019, J/ApJS/244/19), which had similar cadence, but
different from other surveys. In regards to contention in the
literature about whether smaller TNOs are more irregular in shape and
thus have larger lightcurve amplitudes, we found that there is a weak
correlation between absolute magnitude and lightcurve amplitude in a
subset of 194 FOSSIL TNOs, even when using the more appropriate
brightest (minimum) absolute magnitude instead of the time-averaged
value.
Description:
All images in the high-cadence Formation of the Outer Solar System: an
Icy Legacy (FOSSIL) survey were acquired using Hyper Suprime-Cam (HSC)
on Subaru. In all, the survey consists of 13 HSC pointings, producing
a total sky area of 37.7deg2. The pointings were chosen to cover the
L4 and L5 clouds of the Lagrange points of Jupiter. The pointings are
broken up into four blocks (19Apr, 20May, 20Aug, and 20Oct), where the
block name comes from the dates when they were acquired:
2019-April-10, 2020-May-18-19, 2020-August-20-22, and
2020-October-13-16, respectively (all UTC).
All of the images in 19Apr block were acquired in the g-band filter
and span about 8hr of time. Images in the other three blocks were
acquired with the r2 filter and span approximately 4hr each night
except for the last two nights of the 20Oct block.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tnos.dat 28 435 List of TNOs with unique IDs; table added by CDS
table3.dat 67 11312 Astronometric and photometric measurements
for 435 FOSSIL TNOs
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See also:
J/AJ/127/3023 : R magnitudes of Kuiper Belt object 2001QG298 (Sheppard+, 2004)
J/A+A/505/1283 : (84922) 2003 VS2 differential light curve (Duffard+, 2009)
J/A+A/522/A93 : Short-term variability of 29 minor planets (Thirouin+, 2010)
J/AJ/154/241 : Phot. of a Kuiper Belt object: 2002 CC249 (Thirouin+, 2017)
J/ApJS/244/19 : OSSOS. XII. Subaru/HSC obs. of 65 TNOs (Alexandersen+, 2019)
J/AJ/157/228 : Cold Classical TNOs: LCs & rot. properties (Thirouin+, 2019)
J/AJ/159/25 : PS1 light curves and rot. periods of new asteroids (Lo+, 2020)
J/ApJS/259/7 : FOSSIL. II. Subaru/HSC light curves of Hildas (Chang+, 2022)
Byte-by-byte Description of file: tnos.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- ID FOSSIL identifier
17 A1 --- f_ID p: FOSSIL TNOs that show periodic behavior
(see Table 2)
19- 28 A10 --- MPC MPC designation from Table 2
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- ID FOSSIL identifier
17- 32 F16.8 d JD Julian date; Terrestrial Time
34- 43 F10.6 deg RAdeg [8.39/343] Right Ascension (J2000)
45- 54 F10.6 deg DEdeg [-15.51/7.3] Declination (J2000)
56- 61 F6.3 mag rmag [18.85/29.62] Apparent r band magnitude
63- 67 F5.3 mag e_rmag [0.001/1] Uncertainty in rmag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Oct-2023