Physical properties of near-Earth asteroid (2102) Tantalus from multiwavelength observations
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Physical properties of near-Earth asteroid (2102) Tantalus from multiwavelength observations. / Rozek, Agata; Lowry, Stephen C.; Rozitis, Benjamin; Dover, Lord R.; Taylor, Patrick A.; Virkki, Anne; Green, Simon F.; Snodgrass, Colin; Fitzsimmons, Alan; Campbell-White, Justyn; Sajadian, Sedighe; Bozza, Valerio; Burgdorf, Martin J.; Dominik, Martin; Jaimes, R. Figuera; Hinse, Tobias C.; Hundertmark, Markus; Jorgensen, Uffe G.; Longa-Pena, Penelope; Rabus, Markus; Rahvar, Sohrab; Skottfelt, Jesper; Southworth, John.
I: Monthly Notices of the Royal Astronomical Society, Bind 515, Nr. 3, 11.08.2022, s. 4551-4564.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Physical properties of near-Earth asteroid (2102) Tantalus from multiwavelength observations
AU - Rozek, Agata
AU - Lowry, Stephen C.
AU - Rozitis, Benjamin
AU - Dover, Lord R.
AU - Taylor, Patrick A.
AU - Virkki, Anne
AU - Green, Simon F.
AU - Snodgrass, Colin
AU - Fitzsimmons, Alan
AU - Campbell-White, Justyn
AU - Sajadian, Sedighe
AU - Bozza, Valerio
AU - Burgdorf, Martin J.
AU - Dominik, Martin
AU - Jaimes, R. Figuera
AU - Hinse, Tobias C.
AU - Hundertmark, Markus
AU - Jorgensen, Uffe G.
AU - Longa-Pena, Penelope
AU - Rabus, Markus
AU - Rahvar, Sohrab
AU - Skottfelt, Jesper
AU - Southworth, John
PY - 2022/8/11
Y1 - 2022/8/11
N2 - Between 2010 and 2017, we have collected new optical and radar observations of the potentially hazardous asteroid (2102) Tantalus from the ESO NTT and Danish telescopes at the La Silla Observatory, and from the Arecibo planetary radar. The object appears to be nearly spherical, showing a low-amplitude light-curve variation and limited large-scale features in the radar images. The spin-state is difficult to constrain with the available data; including a certain light-curve subset significantly changes the spin-state estimates, and the uncertainties on period determination are significant. Constraining any change in rotation rate was not possible, despite decades of observations. The convex light curve-inversion model, with rotational pole at lambda = 210 degrees +/- 41 degrees and beta = -30 degrees +/- 35 degrees, is more flattened than the two models reconstructed by including radar observations: with prograde (lambda= 36 degrees +/- 23 degrees, beta = 30 degrees +/- 15 degrees), and with retrograde rotation mode (lambda = 180 degrees +/- 24 degrees, beta = -30 +/- 16 degrees). Using data from WISE, we were able to determine that the prograde model produces the best agreement in size determination between radar and thermophysical modelling. Radar measurements indicate possible variation in surface properties, suggesting one side might have lower radar albedo and be rougher at the centimetre-to-decimetre scale than the other. However, further observations are needed to confirm this. Thermophysical analysis indicates a surface covered in fine-grained regolith, consistent with radar albedo, and polarisation ratio measurements. Finally, geophysical investigation of the spin-stability of Tantalus shows that it could be exceeding its critical spin-rate via cohesive forces.
AB - Between 2010 and 2017, we have collected new optical and radar observations of the potentially hazardous asteroid (2102) Tantalus from the ESO NTT and Danish telescopes at the La Silla Observatory, and from the Arecibo planetary radar. The object appears to be nearly spherical, showing a low-amplitude light-curve variation and limited large-scale features in the radar images. The spin-state is difficult to constrain with the available data; including a certain light-curve subset significantly changes the spin-state estimates, and the uncertainties on period determination are significant. Constraining any change in rotation rate was not possible, despite decades of observations. The convex light curve-inversion model, with rotational pole at lambda = 210 degrees +/- 41 degrees and beta = -30 degrees +/- 35 degrees, is more flattened than the two models reconstructed by including radar observations: with prograde (lambda= 36 degrees +/- 23 degrees, beta = 30 degrees +/- 15 degrees), and with retrograde rotation mode (lambda = 180 degrees +/- 24 degrees, beta = -30 +/- 16 degrees). Using data from WISE, we were able to determine that the prograde model produces the best agreement in size determination between radar and thermophysical modelling. Radar measurements indicate possible variation in surface properties, suggesting one side might have lower radar albedo and be rougher at the centimetre-to-decimetre scale than the other. However, further observations are needed to confirm this. Thermophysical analysis indicates a surface covered in fine-grained regolith, consistent with radar albedo, and polarisation ratio measurements. Finally, geophysical investigation of the spin-stability of Tantalus shows that it could be exceeding its critical spin-rate via cohesive forces.
KW - techniques: photometric
KW - techniques: radar astronomy
KW - minor planets, asteroids: individual: (2102) Tantalus
KW - methods: observational
KW - RADAR SURVEY
KW - PLANETARY SURFACES
KW - SPIN-UP
KW - YORP
KW - YARKOVSKY
KW - OBJECTS
KW - MODEL
KW - STATE
KW - ACCELERATION
KW - ROTATION
U2 - 10.1093/mnras/stac1835
DO - 10.1093/mnras/stac1835
M3 - Journal article
VL - 515
SP - 4551
EP - 4564
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 317937725