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)
2026-05-12 00:00	19:45:16.89	-36:51:42.7	HIP 97354	29.00
2026-05-12 12:00	19:45:15.15	-36:52:01.5	HIP 97354	29.09
2026-05-13 00:00	19:45:13.36	-36:52:20.4	HIP 97354	29.18
2026-05-13 12:00	19:45:11.53	-36:52:39.2	HIP 97354	29.29
2026-05-14 00:00	19:45:09.66	-36:52:58.1	HIP 97354	29.42
2026-05-14 12:00	19:45:07.75	-36:53:17.0	HIP 97354	29.56
2026-05-15 00:00	19:45:05.79	-36:53:35.9	HIP 97354	29.71
2026-05-15 12:00	19:45:03.79	-36:53:54.9	HIP 97354	29.88
2026-05-16 00:00	19:45:01.75	-36:54:13.8	HIP 97354	30.07
2026-05-16 12:00	19:44:59.67	-36:54:32.8	HIP 97354	30.27
2026-05-17 00:00	19:44:57.54	-36:54:51.8	HIP 97354	30.48
2026-05-17 12:00	19:44:55.38	-36:55:10.8	HIP 97354	30.71
2026-05-18 00:00	19:44:53.17	-36:55:29.8	HIP 97354	30.95
2026-05-18 12:00	19:44:50.92	-36:55:48.8	HIP 97354	31.21
2026-05-19 00:00	19:44:48.64	-36:56:07.8	HIP 97354	31.48
2026-05-19 12:00	19:44:46.31	-36:56:26.8	HIP 97354	31.77
2026-05-20 00:00	19:44:43.94	-36:56:45.8	HIP 97354	32.07
2026-05-20 12:00	19:44:41.53	-36:57:04.8	HIP 97354	32.38
2026-05-21 00:00	19:44:39.08	-36:57:23.8	HIP 97354	32.71
2026-05-21 12:00	19:44:36.59	-36:57:42.8	HIP 97354	33.06
2026-05-22 00:00	19:44:34.06	-36:58:01.8	HIP 96896	33.25
2026-05-22 12:00	19:44:31.50	-36:58:20.8	HIP 96896	32.79
2026-05-23 00:00	19:44:28.89	-36:58:39.7	HIP 96896	32.33
2026-05-23 12:00	19:44:26.25	-36:58:58.7	HIP 96896	31.86
2026-05-24 00:00	19:44:23.56	-36:59:17.6	HIP 96896	31.39
2026-05-24 12:00	19:44:20.84	-36:59:36.5	HIP 96896	30.92
2026-05-25 00:00	19:44:18.08	-36:59:55.4	HIP 96896	30.45
2026-05-25 12:00	19:44:15.29	-37:00:14.3	HIP 96896	29.97
2026-05-26 00:00	19:44:12.45	-37:00:33.2	HIP 96896	29.50
2026-05-26 12:00	19:44:09.58	-37:00:52.0	HIP 96896	29.02
2026-05-27 00:00	19:44:06.68	-37:01:10.8	HIP 96896	28.55
2026-05-27 12:00	19:44:03.73	-37:01:29.6	HIP 96896	28.07
2026-05-28 00:00	19:44:00.75	-37:01:48.4	HIP 96896	27.60
2026-05-28 12:00	19:43:57.74	-37:02:07.1	HIP 96896	27.13
2026-05-29 00:00	19:43:54.69	-37:02:25.8	HIP 96896	26.66
2026-05-29 12:00	19:43:51.60	-37:02:44.4	HIP 97000	26.14
2026-05-30 00:00	19:43:48.48	-37:03:03.0	HIP 97000	25.60
2026-05-30 12:00	19:43:45.32	-37:03:21.6	HIP 97000	25.06
2026-05-31 00:00	19:43:42.13	-37:03:40.2	HIP 97000	24.53
2026-05-31 12:00	19:43:38.90	-37:03:58.7	HIP 97000	24.01
2026-06-01 00:00	19:43:35.64	-37:04:17.1	HIP 97000	23.49
2026-06-01 12:00	19:43:32.34	-37:04:35.5	HIP 97000	22.99
2026-06-02 00:00	19:43:29.01	-37:04:53.9	HIP 97000	22.49