メタデータ

項目	値
Designation	C/1966 T1 (Rudnicki)
Type	C
Perihelion (tp_cal, UTC)	1967-01-20T21:13:46.761600Z
Orbit solution date (soln_date, UTC)	2021-04-15T23:29:17Z
Obs used	49
NEO	-
M1	10.100
K1	11.000
PC	-

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	1966-11-19.0000000
e	1.00039019
q (au)	0.419209
a (au)	-1074.385463
i (deg)	9.079808
Ω (om, deg)	75.708464
ω (w, deg)	79.785459
M (ma, deg)	-0.001760

等級

散乱 + 全体線形

$$ M_a = (9.738 + 2.616\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	9.738
n	2.616
gf	0.800
gb	-0.500
k	1.000
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
1966-10-20	1966-12-03	+4.4444	-0.492
1966-12-03	1967-01-04	-6.0437	-0.279

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)
2026-09-20 00:00	22:08:51.09	-20:43:30.6	HIP 109223	17.14
2026-09-20 12:00	22:08:49.89	-20:43:35.3	HIP 109223	16.85
2026-09-21 00:00	22:08:48.68	-20:43:40.0	HIP 109223	16.56
2026-09-21 12:00	22:08:47.49	-20:43:44.6	HIP 109223	16.28
2026-09-22 00:00	22:08:46.30	-20:43:49.2	HIP 109223	15.99
2026-09-22 12:00	22:08:45.11	-20:43:53.7	HIP 109223	15.71
2026-09-23 00:00	22:08:43.94	-20:43:58.2	HIP 109223	15.43
2026-09-23 12:00	22:08:42.76	-20:44:02.6	HIP 109223	15.14
2026-09-24 00:00	22:08:41.60	-20:44:06.9	HIP 109223	14.87
2026-09-24 12:00	22:08:40.44	-20:44:11.2	HIP 109223	14.59
2026-09-25 00:00	22:08:39.28	-20:44:15.4	HIP 109223	14.31
2026-09-25 12:00	22:08:38.13	-20:44:19.6	HIP 109223	14.04
2026-09-26 00:00	22:08:36.99	-20:44:23.7	HIP 109223	13.77
2026-09-26 12:00	22:08:35.86	-20:44:27.7	HIP 109223	13.50
2026-09-27 00:00	22:08:34.73	-20:44:31.7	HIP 109223	13.23
2026-09-27 12:00	22:08:33.61	-20:44:35.6	HIP 109223	12.96
2026-09-28 00:00	22:08:32.49	-20:44:39.5	HIP 109223	12.70
2026-09-28 12:00	22:08:31.38	-20:44:43.3	HIP 109223	12.44
2026-09-29 00:00	22:08:30.28	-20:44:47.1	HIP 109223	12.18
2026-09-29 12:00	22:08:29.19	-20:44:50.8	HIP 109223	11.92
2026-09-30 00:00	22:08:28.10	-20:44:54.4	HIP 109223	11.66
2026-09-30 12:00	22:08:27.02	-20:44:58.0	HIP 109223	11.40
2026-10-01 00:00	22:08:25.95	-20:45:01.5	HIP 109223	11.15
2026-10-01 12:00	22:08:24.88	-20:45:05.0	HIP 109223	10.90
2026-10-02 00:00	22:08:23.83	-20:45:08.4	HIP 109223	10.65
2026-10-02 12:00	22:08:22.78	-20:45:11.7	HIP 109223	10.40
2026-10-03 00:00	22:08:21.73	-20:45:15.0	HIP 109223	10.16
2026-10-03 12:00	22:08:20.70	-20:45:18.2	HIP 109223	9.91
2026-10-04 00:00	22:08:19.67	-20:45:21.3	HIP 109223	9.67
2026-10-04 12:00	22:08:18.65	-20:45:24.4	HIP 109223	9.43
2026-10-05 00:00	22:08:17.64	-20:45:27.4	HIP 109223	9.20
2026-10-05 12:00	22:08:16.64	-20:45:30.4	HIP 109223	8.96
2026-10-06 00:00	22:08:15.64	-20:45:33.3	HIP 109223	8.73
2026-10-06 12:00	22:08:14.65	-20:45:36.1	HIP 109223	8.50
2026-10-07 00:00	22:08:13.67	-20:45:38.9	HIP 109223	8.27
2026-10-07 12:00	22:08:12.70	-20:45:41.6	HIP 109223	8.04
2026-10-08 00:00	22:08:11.74	-20:45:44.2	HIP 109223	7.82
2026-10-08 12:00	22:08:10.79	-20:45:46.8	HIP 109223	7.60
2026-10-09 00:00	22:08:09.84	-20:45:49.3	HIP 109223	7.38
2026-10-09 12:00	22:08:08.91	-20:45:51.7	HIP 109223	7.16
2026-10-10 00:00	22:08:07.98	-20:45:54.1	HIP 109223	6.94
2026-10-10 12:00	22:08:07.06	-20:45:56.4	HIP 109223	6.73
2026-10-11 00:00	22:08:06.15	-20:45:58.6	HIP 109223	6.52