DPS – 2012 – Reno/NV STELLAR OCCULTATIONS BY LARGE TNOS ON 2012: THE FEBRUARY 3 RD BY (208996)...
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Transcript of DPS – 2012 – Reno/NV STELLAR OCCULTATIONS BY LARGE TNOS ON 2012: THE FEBRUARY 3 RD BY (208996)...
![Page 1: DPS – 2012 – Reno/NV STELLAR OCCULTATIONS BY LARGE TNOS ON 2012: THE FEBRUARY 3 RD BY (208996) 2003 AZ84, AND THE FEBRUARY 17 TH BY (50000) QUAOAR. Felipe.](https://reader033.fdocuments.net/reader033/viewer/2022061306/551493a5550346b2598b5442/html5/thumbnails/1.jpg)
DPS – 2012 – Reno/NVDPS – 2012 – Reno/NV
STELLAR OCCULTATIONS BY LARGE TNOS ON 2012: STELLAR OCCULTATIONS BY LARGE TNOS ON 2012: THE FEBRUARY 3THE FEBRUARY 3RDRD BY (208996) BY (208996) 2003 AZ842003 AZ84, AND , AND
THE FEBRUARY 17THE FEBRUARY 17THTH BY (50000) BY (50000) QUAOARQUAOAR. .
Felipe Braga-Ribas1,3, B. Sicardy1, J. L. Ortiz2, R. Duffard2, J. I. B. Camargo3, J. Lecacheux1, F. Colas4, F. Vachier4, P. Tanga5, S. Sposetti6, N. Brosch7, S. Kaspi7, I. Manulis8, T. Baug9, T. Chandrasekhar9, S. Ganesh9, J. Jain9, V. Mohan10, A. Sharma11, R. Garcia-Lozano12, A. Klotz13, E. Frappa14, E. Jehin15, M. Assafin16, R. Vieira-Martins3, R. Behrend17, F. Roques1, T. Widemann1, N. Morales2, A. Thirouin2, P. Mahasena18, Z. Benkhaldoun19, A. Daassou19, C. Rinner20, E. O. Ofek8, A. Gal-Yam's8
1-Observatoire de Paris-Meudon / LESIA, France, 2-Instituto de Astrofísica de Andalucía, CSIC, Spain, 3-Observatório Nacional / MCTI, Brazil, 4-Observatoire de Paris- Meudon / IMCCE, France, 5-Observatoire de la Côte d'Azur, France, 6-Gnosca Observatory, Switzerland, 7-Wise Observatory, Tel Aviv University, Israel, 8-Weizmann Institute of Science, Israel, 9-Physical Research Laboratory, India, 10-IUCAA Girawali Observatory, India, 11-Nikaya Observatory, India, 12-Observatorio de Busot, Spain, 13-Université de Toulouse, UPS-OMP, IRAP, France, 14-EURASTER, 1bis cours Jovin Bouchard, 42000, France, 15-Institut d’Astrophysique de l’Université de Liège, Belgium, 16-Observatório do Valongo / UFRJ, Brazil, 17-Observatoire de Genève, Switzerland, 18-Observatorium Bosscha, Institut Teknologi Bandung, Indonesia, 19-Oukaimeden Observatory, LPHEA, Cadi Ayyad University, Morocco, 20-Moroccan Oukaimeden Sky Survey, Morocco.
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THE FEBRUARY 17THE FEBRUARY 17THTH BY (50000) BY (50000) QUAOARQUAOAR
- Prediction from Prediction from Assafin Assafin et al. 2012*et al. 2012*
- A faint star: R mag A faint star: R mag 15.515.5;;
- Positive detection from Positive detection from 4 sites4 sites: :
Côte D’Azur Obs./ FRCôte D’Azur Obs./ FR
TAROT Grasse/ FRTAROT Grasse/ FR
Valensole/ FRValensole/ FR
Gnosca/ SW.Gnosca/ SW.
- French sites over the same Quaoar’s French sites over the same Quaoar’s latitudelatitude
- in practice we have two chords.in practice we have two chords.
* M. Assafin, et al. Candidate stellar occultations by large TNOs up to 2015, A&A, v. 541, p.A142, 2012.
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THE FEBRUARY 17THE FEBRUARY 17THTH BY (50000) BY (50000) QUAOARQUAOAR
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Diameter > 1560 km
----------------------------From literature:
Brown & Trujillo 2004Deq = 1260 ± 190 km
Fraser & Brown 2010 Deq= 890 ± 70 km
Fornasier et al.DPS2012 Poster#310.14
Deq= 1036 ± 31km
Braga-Ribas et al.EPSC-DPS 2011
Deq= 1045 – 1095 km
Switzerland
Côte D’Azur Obs./ FR
TAROT Grasse/ FR
Valensole/ FR
ASSUMING CIRCULAR SOLUTION:ASSUMING CIRCULAR SOLUTION:
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The circular
solution from
February 2012 is
incompatible with
the observations
from May 2011
occultation.
That means:
Quaoar must be elongated
INCOMPATIBLE WITH THE 2011 OBSERVATIONINCOMPATIBLE WITH THE 2011 OBSERVATION
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THE MAY 04THE MAY 04TH TH 20112011 (EPSC-DPS 2011)(EPSC-DPS 2011)
Nominal solution:
all pointsIncluded
Crater solution:
very elongated
Mountain solution:
similar to nominal
Time shifted solution:
equilibrium body.
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THE 2012 CHORDS ARE CONSISTENT THE 2012 CHORDS ARE CONSISTENT WITH THE 2011 SOLUTIONSWITH THE 2011 SOLUTIONS
Nominal solution:
all pointsIncluded
Crater solution:
very elongated
Mountain solution:
similar to nominal
Time shifted solution:
equilibrium body.
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* Volume of an oblate spheroid. Mass = 1.65 ± 0.16 E21 kg from Vachier et al. 2012F. Vachier, et al. Determination of binary asteroid orbits with a genetic-based algorithm, A&A, v.543, p.A68, 2012.
THE FEBRUARY 17THE FEBRUARY 17THTH BY (50000) BY (50000) QUAOARQUAOAR
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MACLAURIN HYDROSTATIC MACLAURIN HYDROSTATIC EQUILIBRIUM BODYEQUILIBRIUM BODY
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THE FEBRUARY 3THE FEBRUARY 3RDRD BY (208996) BY (208996) 2003 2003 AZ84AZ84
- Prediction from Prediction from Assafin Assafin et al. 2012et al. 2012
- A faint star: R mag A faint star: R mag 15.115.1;;
- Positive detection from Positive detection from 3 sites3 sites::
Mount Abu Observatory/ IndiaMount Abu Observatory/ India
Weizmann Inst. / IsraelWeizmann Inst. / Israel
IUCAA - Girawali Obs./ IndiaIUCAA - Girawali Obs./ India
- Negative from several sites:Negative from several sites:
- the closest two:the closest two:
- Alicante / SpainAlicante / Spain
- Liverpool Obs. / Spain (Canary)Liverpool Obs. / Spain (Canary)
* M. Assafin, et al. Candidate stellar occultations by large TNOs up to 2015, A&A, v. 541, p.A142, 2012.
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THE FEBRUARY 3THE FEBRUARY 3RDRD BY (208996) BY (208996) 2003 2003 AZ84AZ84
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THE FEBRUARY 3THE FEBRUARY 3RDRD BY (208996) BY (208996) 2003 2003 AZ84AZ84
Equivalente diameter:686 ± 14 km
Oblateness:0.37 ± 0.1
a = 433km, b= 271km
Geometric albedo:pv= 0.147 ± 0.007*
*using Peixinho et al. 2012 (Hv=3.54 ± 0.05)
Literature:
Stansberry et al. 2008686 ± 95km
Muller et al. 2010
910 ± 60km
Mommert et al. 2012
727 ± 66km
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ρ = 0.76 - 0.17+ 0.30
*
* From Thirouin et al. 2010.
MACLAURIN HYDROSTATIC MACLAURIN HYDROSTATIC EQUILIBRIUM BODYEQUILIBRIUM BODY
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THE FEBRUARY 3THE FEBRUARY 3RDRD BY (208996) BY (208996) 2003 2003 AZ84AZ84
Summary for the 2003 AZ84 results:Summary for the 2003 AZ84 results:
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THE THE OCTOBER 15OCTOBER 15TH TH 2012 BY (50000) 2012 BY (50000) QUAOARQUAOAR
Joe Pollock and Kevin Ivarsen, from Cerro Tololo using PROMPT.
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THE TNO OCCULTATION CAMPAIGNS THE TNO OCCULTATION CAMPAIGNS
Nature« in press »