Spitzer Space Telescope observations of bilobate comet 8P/Tuttle

O. Groussin; P. L. Lamy; M. S. P. Kelley; I. Toth; L. Jorda; Y. R. Fernández; H. A. Weaver

doi:10.1051/0004-6361/201936458

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Volume 632 (December 2019)

A&A, 632 (2019) A104

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Table 4

Results for the fits of the synthetic thermal light curve to the MIPS data using the HST and radar shape models.

η	I	HST shape model				Radar shape model

		Prograde		Retrograde		Prograde		Retrograde

		γ	χ²	γ	χ²	γ	χ²	γ	χ²
0.7	0	0.83	37.0	0.83	37.6	0.91	193.2	0.90	190.7
0.7	50	0.89	31.6	0.97	35.1	0.97	171.6	1.05	187.8
0.7	100	0.97	27.8	1.07	30.6	1.04	155.1	1.14	161.7
0.7	200	1.09	21.3	1.21	26.5	1.15	132.1	1.26	125.4
0.7	400	1.23	19.4	1.33	26.4	1.28	114.6	1.37	108.5
0.7	800	1.35	25.1	1.41	31.3	1.37	110.8	1.44	112.6
0.8	0	0.90	36.9	0.90	37.6	0.99	194.1	0.99	191.6
0.8	50	0.97	31.8	1.06	35.5	1.06	173.1	1.14	190.0
0.8	100	1.05	28.1	1.17	30.8	1.14	156.5	1.25	164.8
0.8	200	1.19	21.4	1.33	26.7	1.26	133.1	1.38	127.1
0.8	400	1.36	19.4	1.47	26.7	1.40	115.1	1.50	108.8
0.8	800	1.49	25.6	1.56	31.9	1.51	110.6	1.58	112.3
0.9	0	0.97	37.1	0.97	37.8	1.07	194.9	1.06	192.4
0.9	50	1.05	31.9	1.14	35.9	1.14	174.4	1.23	192.0
0.9	100	1.14	28.2	1.27	31.1	1.23	157.9	1.35	167.4
0.9	200	1.29	21.5	1.44	26.9	1.36	134.3	1.49	128.8
0.9	400	1.48	19.5	1.60	27.1	1.52	115.7	1.63	109.3
0.9	800	1.63	26.2	1.71	32.4	1.64	110.4	1.72	112.2
1.0	0	1.04	37.2	1.05	37.8	1.14	195.7	1.14	193.0
1.0	50	1.13	32.2	1.23	36.1	1.23	175.7	1.32	193.7
1.0	100	1.22	28.5	1.37	31.5	1.32	159.2	1.45	169.9
1.0	200	1.39	21.6	1.55	27.1	1.46	135.3	1.61	130.5
1.0	400	1.59	19.5	1.73	27.3	1.64	116.2	1.76	109.8
1.0	800	1.76	26.6	1.86	32.9	1.77	110.3	1.87	112.1

Notes. η is the beaming factor. I is the nucleus thermal inertia (J K⁻¹ m⁻² s^−1∕2). γ is the derived scaling factor for the nucleus shape model to match the MIPS infrared flux. χ² is the chi-square value; for reference, our model has 16 degrees of freedom (19 data points and 3 free parameters).

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