The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36

J. A. Stansberry, W. M. Grundy, J. L. Margot, D. P. Cruikshank, J. P. Emery, G. H. Rieke, David E Trilling

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We measured the system-integrated thermal emission of the binary Kuiper Belt object (47171 ) 1999 TC36, at wavelengths near 24 and 70 μm using the Spitzer Space Telescope. We fit these data and the visual magnitude using both the standard thermal model and thermophysical models. We find that the effective diameter of the binary is 405 km, with a range of 350-470 km, and the effective visible geometric albedo for the system is 0.079, with a range of 0.055-0.11. The binary orbit, magnitude contrast between the components, and system mass have been determined from HSTdata studied by Margot et al. Our effective diameter, combined with that system mass, indicates an average density for the objects of 0.5 g cm-3, with a range 0.3-0.8 g cm -3. This density is low compared to that of materials expected to be abundant in solid bodies in the trans-Neptunian region, requiring 50%-75% of the interior of (47171 ) 1999 TC36 be taken up by void space. This conclusion is not greatly affected if (47171)1999 TC36 is "differentiated" (in the sense of having either a rocky or just a nonporous core). If the primary is itself a binary, the average density of that (hypothetical) triple system would be in the range 0.4-1.l g cm -3, with a porosity in the range 15%-70%.

Original languageEnglish (US)
Pages (from-to)556-566
Number of pages11
JournalAstrophysical Journal
Volume643
Issue number1 I
DOIs
StatePublished - May 20 2006
Externally publishedYes

Fingerprint

Kuiper belt
albedo
Space Infrared Telescope Facility
thermal emission
void
voids
porosity
wavelength
orbits
wavelengths

Keywords

  • Infrared: solar system
  • Kuiper Belt
  • Solar system: formation

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Stansberry, J. A., Grundy, W. M., Margot, J. L., Cruikshank, D. P., Emery, J. P., Rieke, G. H., & Trilling, D. E. (2006). The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36. Astrophysical Journal, 643(1 I), 556-566. https://doi.org/10.1086/502674

The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36. / Stansberry, J. A.; Grundy, W. M.; Margot, J. L.; Cruikshank, D. P.; Emery, J. P.; Rieke, G. H.; Trilling, David E.

In: Astrophysical Journal, Vol. 643, No. 1 I, 20.05.2006, p. 556-566.

Research output: Contribution to journalArticle

Stansberry, JA, Grundy, WM, Margot, JL, Cruikshank, DP, Emery, JP, Rieke, GH & Trilling, DE 2006, 'The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36', Astrophysical Journal, vol. 643, no. 1 I, pp. 556-566. https://doi.org/10.1086/502674
Stansberry JA, Grundy WM, Margot JL, Cruikshank DP, Emery JP, Rieke GH et al. The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36. Astrophysical Journal. 2006 May 20;643(1 I):556-566. https://doi.org/10.1086/502674
Stansberry, J. A. ; Grundy, W. M. ; Margot, J. L. ; Cruikshank, D. P. ; Emery, J. P. ; Rieke, G. H. ; Trilling, David E. / The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36. In: Astrophysical Journal. 2006 ; Vol. 643, No. 1 I. pp. 556-566.
@article{6517e309a2cc46a4923f30615b0ecd15,
title = "The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36",
abstract = "We measured the system-integrated thermal emission of the binary Kuiper Belt object (47171 ) 1999 TC36, at wavelengths near 24 and 70 μm using the Spitzer Space Telescope. We fit these data and the visual magnitude using both the standard thermal model and thermophysical models. We find that the effective diameter of the binary is 405 km, with a range of 350-470 km, and the effective visible geometric albedo for the system is 0.079, with a range of 0.055-0.11. The binary orbit, magnitude contrast between the components, and system mass have been determined from HSTdata studied by Margot et al. Our effective diameter, combined with that system mass, indicates an average density for the objects of 0.5 g cm-3, with a range 0.3-0.8 g cm -3. This density is low compared to that of materials expected to be abundant in solid bodies in the trans-Neptunian region, requiring 50{\%}-75{\%} of the interior of (47171 ) 1999 TC36 be taken up by void space. This conclusion is not greatly affected if (47171)1999 TC36 is {"}differentiated{"} (in the sense of having either a rocky or just a nonporous core). If the primary is itself a binary, the average density of that (hypothetical) triple system would be in the range 0.4-1.l g cm -3, with a porosity in the range 15{\%}-70{\%}.",
keywords = "Infrared: solar system, Kuiper Belt, Solar system: formation",
author = "Stansberry, {J. A.} and Grundy, {W. M.} and Margot, {J. L.} and Cruikshank, {D. P.} and Emery, {J. P.} and Rieke, {G. H.} and Trilling, {David E}",
year = "2006",
month = "5",
day = "20",
doi = "10.1086/502674",
language = "English (US)",
volume = "643",
pages = "556--566",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 I",

}

TY - JOUR

T1 - The albedo, size, and density of binary Kuiper Belt object (47171) 1999 TC36

AU - Stansberry, J. A.

AU - Grundy, W. M.

AU - Margot, J. L.

AU - Cruikshank, D. P.

AU - Emery, J. P.

AU - Rieke, G. H.

AU - Trilling, David E

PY - 2006/5/20

Y1 - 2006/5/20

N2 - We measured the system-integrated thermal emission of the binary Kuiper Belt object (47171 ) 1999 TC36, at wavelengths near 24 and 70 μm using the Spitzer Space Telescope. We fit these data and the visual magnitude using both the standard thermal model and thermophysical models. We find that the effective diameter of the binary is 405 km, with a range of 350-470 km, and the effective visible geometric albedo for the system is 0.079, with a range of 0.055-0.11. The binary orbit, magnitude contrast between the components, and system mass have been determined from HSTdata studied by Margot et al. Our effective diameter, combined with that system mass, indicates an average density for the objects of 0.5 g cm-3, with a range 0.3-0.8 g cm -3. This density is low compared to that of materials expected to be abundant in solid bodies in the trans-Neptunian region, requiring 50%-75% of the interior of (47171 ) 1999 TC36 be taken up by void space. This conclusion is not greatly affected if (47171)1999 TC36 is "differentiated" (in the sense of having either a rocky or just a nonporous core). If the primary is itself a binary, the average density of that (hypothetical) triple system would be in the range 0.4-1.l g cm -3, with a porosity in the range 15%-70%.

AB - We measured the system-integrated thermal emission of the binary Kuiper Belt object (47171 ) 1999 TC36, at wavelengths near 24 and 70 μm using the Spitzer Space Telescope. We fit these data and the visual magnitude using both the standard thermal model and thermophysical models. We find that the effective diameter of the binary is 405 km, with a range of 350-470 km, and the effective visible geometric albedo for the system is 0.079, with a range of 0.055-0.11. The binary orbit, magnitude contrast between the components, and system mass have been determined from HSTdata studied by Margot et al. Our effective diameter, combined with that system mass, indicates an average density for the objects of 0.5 g cm-3, with a range 0.3-0.8 g cm -3. This density is low compared to that of materials expected to be abundant in solid bodies in the trans-Neptunian region, requiring 50%-75% of the interior of (47171 ) 1999 TC36 be taken up by void space. This conclusion is not greatly affected if (47171)1999 TC36 is "differentiated" (in the sense of having either a rocky or just a nonporous core). If the primary is itself a binary, the average density of that (hypothetical) triple system would be in the range 0.4-1.l g cm -3, with a porosity in the range 15%-70%.

KW - Infrared: solar system

KW - Kuiper Belt

KW - Solar system: formation

UR - http://www.scopus.com/inward/record.url?scp=33745848789&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745848789&partnerID=8YFLogxK

U2 - 10.1086/502674

DO - 10.1086/502674

M3 - Article

VL - 643

SP - 556

EP - 566

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 I

ER -