メタデータ

項目	値
Designation	165P/LINEAR
Type	P
Perihelion (tp_cal, UTC)	2000-06-15T19:02:32.447040Z
Orbit solution date (soln_date, UTC)	2021-04-15T23:27:43Z
Obs used	143
NEO	-
M1	5.900
K1	11.500
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2001-07-24.0000000
e	0.62158598
q (au)	6.830373
a (au)	18.050001
i (deg)	15.905264
Ω (om, deg)	0.638768
ω (w, deg)	126.205423
M (ma, deg)	5.182220

等級

散乱 + 全体線形

$$ M_a = (4.024 + 5.222\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	4.024
n	5.222
gf	1.000
gb	-0.919
k	1.000
δ90	10.000

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

天体暦

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-03-26 00:00	19:44:40.08	-36:27:36.8	HIP 96932	31.31
2026-03-26 12:00	19:44:42.55	-36:27:47.0	HIP 96932	31.72
2026-03-27 00:00	19:44:44.98	-36:27:57.4	HIP 96932	32.13
2026-03-27 12:00	19:44:47.36	-36:28:07.9	HIP 96932	32.53
2026-03-28 00:00	19:44:49.70	-36:28:18.5	HIP 96932	32.92
2026-03-28 12:00	19:44:52.01	-36:28:29.3	HIP 96932	33.31
2026-03-29 00:00	19:44:54.26	-36:28:40.2	HIP 96932	33.70
2026-03-29 12:00	19:44:56.48	-36:28:51.2	HIP 96932	34.07
2026-03-30 00:00	19:44:58.65	-36:29:02.4	HIP 96932	34.44
2026-03-30 12:00	19:45:00.78	-36:29:13.7	HIP 96932	34.81
2026-03-31 00:00	19:45:02.86	-36:29:25.1	HIP 96932	35.17
2026-03-31 12:00	19:45:04.91	-36:29:36.7	HIP 96932	35.52
2026-04-01 00:00	19:45:06.91	-36:29:48.4	HIP 96932	35.86
2026-04-01 12:00	19:45:08.86	-36:30:00.3	HIP 96932	36.20
2026-04-02 00:00	19:45:10.77	-36:30:12.3	HIP 96932	36.53
2026-04-02 12:00	19:45:12.64	-36:30:24.4	HIP 96932	36.85
2026-04-03 00:00	19:45:14.46	-36:30:36.6	HIP 96932	37.17
2026-04-03 12:00	19:45:16.24	-36:30:49.0	HIP 96932	37.48
2026-04-04 00:00	19:45:17.98	-36:31:01.5	HIP 96932	37.78
2026-04-04 12:00	19:45:19.67	-36:31:14.1	HIP 96932	38.08
2026-04-05 00:00	19:45:21.32	-36:31:26.8	HIP 96932	38.37
2026-04-05 12:00	19:45:22.92	-36:31:39.7	HIP 96932	38.65
2026-04-06 00:00	19:45:24.48	-36:31:52.7	HIP 96932	38.92
2026-04-06 12:00	19:45:25.99	-36:32:05.8	HIP 96932	39.18
2026-04-07 00:00	19:45:27.46	-36:32:19.1	HIP 96932	39.44
2026-04-07 12:00	19:45:28.89	-36:32:32.5	HIP 96932	39.69
2026-04-08 00:00	19:45:30.27	-36:32:45.9	HIP 96932	39.94
2026-04-08 12:00	19:45:31.60	-36:32:59.6	HIP 96932	40.17
2026-04-09 00:00	19:45:32.89	-36:33:13.3	HIP 96932	40.40
2026-04-09 12:00	19:45:34.13	-36:33:27.1	HIP 96932	40.62
2026-04-10 00:00	19:45:35.33	-36:33:41.1	HIP 97354	40.73
2026-04-10 12:00	19:45:36.49	-36:33:55.2	HIP 97354	40.41
2026-04-11 00:00	19:45:37.59	-36:34:09.4	HIP 97354	40.10
2026-04-11 12:00	19:45:38.66	-36:34:23.7	HIP 97354	39.79
2026-04-12 00:00	19:45:39.67	-36:34:38.1	HIP 97354	39.48
2026-04-12 12:00	19:45:40.64	-36:34:52.7	HIP 97354	39.18
2026-04-13 00:00	19:45:41.57	-36:35:07.3	HIP 97354	38.87
2026-04-13 12:00	19:45:42.45	-36:35:22.1	HIP 97354	38.58
2026-04-14 00:00	19:45:43.28	-36:35:37.0	HIP 97354	38.28
2026-04-14 12:00	19:45:44.07	-36:35:51.9	HIP 97354	37.98
2026-04-15 00:00	19:45:44.81	-36:36:07.0	HIP 97354	37.69
2026-04-15 12:00	19:45:45.50	-36:36:22.2	HIP 97354	37.40
2026-04-16 00:00	19:45:46.15	-36:36:37.5	HIP 97354	37.12