(42355) Typhon-Echidna: Scheduling observations for binary orbit determination

被引：42

作者：

Grundy, W. M. ^{[1
]}

Noll, K. S. ^{[2
]}

Virtanen, J. ^{[3
]}

Muinonen, K. ^{[4
]}

Kern, S. D. ^{[2
]}

Stephens, D. C. ^{[5
]}

Stansberry, J. A. ^{[6
]}

Levison, H. F. ^{[7
]}

Spencer, J. R. ^{[7
]}

机构：

[1] Lowell Observ, Flagstaff, AZ 86001 USA

[2] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[3] Finnish Geodet Inst, FI-02431 Masala, Finland

[4] Univ Helsinki, Dept Astron, FI-00014 Helsinki, Finland

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[7] SW Res Inst, Boulder, CO 80302 USA

来源：

ICARUS | 2008年 / 197卷 / 01期

关键词：

Kuiper belt; trans-neptunian objects; Centaurs; satellites; general;

D O I：

10.1016/j.icarus.2008.04.004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe a strategy for scheduling astrometric observations to minimize the number required to determine the mutual orbits of binary transneptunian systems. The method is illustrated by application to Hubble Space Telescope observations of (42355) Typhon-Echidna, revealing that Typhon and Echidna orbit one another with a period of 18.971 +/- 0.006 days and a semimajor axis of 1628 +/- 29 km, implying a system mass of (9.49 +/- 0.52) x 10(17) kg. The eccentricity of the orbit is 0.526 +/- 0.015. Combined with a radiometric size determined from Spitzer Space Telescope data and the assumption that Typhon and Echidna both have the same albedo, we estimate that their radii are 76(-16)(+14) and 42(-9)(+8) km, respectively. These numbers give an average bulk density of only 0.44(-0.17)(+0.44) g cm(-3), consistent with very low bulk densities recently reported for two other small transneptunian binaries. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：260 / 268

页数：9

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