メタデータ

項目	値
Designation	C/2002 T7 (LINEAR)
Type	C
Perihelion (tp_cal, UTC)	2004-04-23T01:29:19.495680Z
Orbit solution date (soln_date, UTC)	2021-04-15T23:30:22Z
Obs used	4397
NEO	-
M1	7.600
K1	6.500
PC	-

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2003-11-16.0000000
e	1.00048628
q (au)	0.614546
a (au)	-1263.766985
i (deg)	160.582715
Ω (om, deg)	94.856573
ω (w, deg)	157.739084
M (ma, deg)	-0.003490

等級

散乱 + 全体線形

$$ M_a = (6.176 + 3.575\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	6.176
n	3.575
gf	0.800
gb	-0.500
k	0.800
δ90	1.000

パラメータ	記号	範囲	説明
太陽・地球距離が1 AUのときの絶対等級	H0	-5 to 20	彗星の固有の明るさ
測光スロープパラメータ	n	2 to 6	太陽距離に対する明るさ変化率
前方散乱非対称係数	gf	0.8 to 1	前方散乱の強さ
後方散乱非対称係数	gb	-1 to -0.5	後方散乱の強さ
分配係数	k	0.8 to 1	前方/後方散乱の寄与比
ダスト/ガス明るさ比	δ90	1 to 10	ダスト散乱とガス放射の相対寄与

参考: EPSC-DPS2025-160

残差 (区間線形)

$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$

開始日 (UTC)	終了日 (UTC)	a	b
2001-01-14	2002-10-29	-50.9308	+42.214
2002-10-29	2004-04-22	+0.0934	-0.200
2004-04-23	2004-05-22	+11.1569	+2.707
2004-05-22	2006-03-20	-0.3710	+1.312

log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)

天体暦

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-05-12 00:00	08:29:58.11	+07:29:32.3	HIP 41532	33.43
2026-05-12 12:00	08:29:58.75	+07:29:37.9	HIP 41532	33.62
2026-05-13 00:00	08:29:59.42	+07:29:43.5	HIP 41532	33.80
2026-05-13 12:00	08:30:00.10	+07:29:48.9	HIP 41532	33.99
2026-05-14 00:00	08:30:00.80	+07:29:54.3	HIP 41532	34.18
2026-05-14 12:00	08:30:01.53	+07:29:59.5	HIP 41532	34.38
2026-05-15 00:00	08:30:02.27	+07:30:04.7	HIP 41786	34.42
2026-05-15 12:00	08:30:03.04	+07:30:09.7	HIP 41786	34.39
2026-05-16 00:00	08:30:03.82	+07:30:14.7	HIP 41786	34.37
2026-05-16 12:00	08:30:04.63	+07:30:19.5	HIP 41786	34.34
2026-05-17 00:00	08:30:05.46	+07:30:24.3	HIP 41786	34.31
2026-05-17 12:00	08:30:06.31	+07:30:28.9	HIP 41786	34.27
2026-05-18 00:00	08:30:07.18	+07:30:33.4	HIP 41786	34.24
2026-05-18 12:00	08:30:08.07	+07:30:37.9	HIP 41786	34.20
2026-05-19 00:00	08:30:08.98	+07:30:42.2	HIP 41786	34.16
2026-05-19 12:00	08:30:09.90	+07:30:46.4	HIP 41786	34.12
2026-05-20 00:00	08:30:10.85	+07:30:50.6	HIP 41786	34.07
2026-05-20 12:00	08:30:11.82	+07:30:54.6	HIP 41786	34.02
2026-05-21 00:00	08:30:12.81	+07:30:58.5	HIP 41786	33.98
2026-05-21 12:00	08:30:13.82	+07:31:02.3	HIP 41786	33.93
2026-05-22 00:00	08:30:14.85	+07:31:06.0	HIP 41786	33.87
2026-05-22 12:00	08:30:15.89	+07:31:09.7	HIP 41786	33.82
2026-05-23 00:00	08:30:16.96	+07:31:13.2	HIP 41786	33.76
2026-05-23 12:00	08:30:18.05	+07:31:16.6	HIP 41786	33.71
2026-05-24 00:00	08:30:19.15	+07:31:19.9	HIP 41786	33.65
2026-05-24 12:00	08:30:20.28	+07:31:23.1	HIP 41786	33.59
2026-05-25 00:00	08:30:21.42	+07:31:26.2	HIP 41786	33.53
2026-05-25 12:00	08:30:22.58	+07:31:29.2	HIP 41786	33.47
2026-05-26 00:00	08:30:23.76	+07:31:32.0	HIP 41786	33.41
2026-05-26 12:00	08:30:24.96	+07:31:34.8	HIP 41786	33.34
2026-05-27 00:00	08:30:26.18	+07:31:37.5	HIP 41786	33.28
2026-05-27 12:00	08:30:27.41	+07:31:40.1	HIP 41786	33.22
2026-05-28 00:00	08:30:28.67	+07:31:42.6	HIP 41786	33.15
2026-05-28 12:00	08:30:29.94	+07:31:44.9	HIP 41786	33.09
2026-05-29 00:00	08:30:31.23	+07:31:47.2	HIP 41786	33.02
2026-05-29 12:00	08:30:32.54	+07:31:49.4	HIP 41786	32.96
2026-05-30 00:00	08:30:33.86	+07:31:51.4	HIP 41786	32.89
2026-05-30 12:00	08:30:35.20	+07:31:53.4	HIP 41786	32.83
2026-05-31 00:00	08:30:36.57	+07:31:55.2	HIP 41786	32.77
2026-05-31 12:00	08:30:37.94	+07:31:57.0	HIP 41786	32.70
2026-06-01 00:00	08:30:39.34	+07:31:58.6	HIP 41786	32.64
2026-06-01 12:00	08:30:40.75	+07:32:00.2	HIP 41786	32.58
2026-06-02 00:00	08:30:42.18	+07:32:01.6	HIP 41786	32.52