メタデータ

項目	値
Designation	363P/Lemmon
Type	P
Perihelion (tp_cal, UTC)	2018-03-22T13:30:17.461440Z
Orbit solution date (soln_date, UTC)	2025-04-11T14:45:16Z
Obs used	124
NEO	-
M1	17.300
K1	12.500
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2015-09-25.0000000
e	0.55752671
q (au)	1.506711
a (au)	3.405202
i (deg)	3.974829
Ω (om, deg)	169.924921
ω (w, deg)	315.265579
M (ma, deg)	217.333360

等級

散乱 + 全体線形

$$ M_a = (16.388 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	16.388
n	6.000
gf	1.000
gb	-1.000
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	18:12:38.97	-18:10:26.7	HIP 89158	17.55
2026-03-26 12:00	18:12:49.17	-18:09:51.8	HIP 89158	19.71
2026-03-27 00:00	18:12:59.12	-18:09:16.8	HIP 89384	20.52
2026-03-27 12:00	18:13:08.82	-18:08:41.9	HIP 89384	18.22
2026-03-28 00:00	18:13:18.27	-18:08:06.9	HIP 89384	16.00
2026-03-28 12:00	18:13:27.47	-18:07:31.9	HIP 89384	13.87
2026-03-29 00:00	18:13:36.41	-18:06:57.0	HIP 89384	11.85
2026-03-29 12:00	18:13:45.10	-18:06:22.0	HIP 89384	9.97
2026-03-30 00:00	18:13:53.54	-18:05:47.0	HIP 89384	8.27
2026-03-30 12:00	18:14:01.72	-18:05:12.0	HIP 89384	6.84
2026-03-31 00:00	18:14:09.64	-18:04:37.0	HIP 89384	5.82
2026-03-31 12:00	18:14:17.31	-18:04:02.1	HIP 89384	5.38
2026-04-01 00:00	18:14:24.72	-18:03:27.1	HIP 89384	5.61
2026-04-01 12:00	18:14:31.87	-18:02:52.2	HIP 89384	6.37
2026-04-02 00:00	18:14:38.76	-18:02:17.3	HIP 89384	7.47
2026-04-02 12:00	18:14:45.40	-18:01:42.5	HIP 89384	8.74
2026-04-03 00:00	18:14:51.77	-18:01:07.7	HIP 89384	10.09
2026-04-03 12:00	18:14:57.88	-18:00:32.9	HIP 89384	11.47
2026-04-04 00:00	18:15:03.73	-17:59:58.2	HIP 89384	12.85
2026-04-04 12:00	18:15:09.32	-17:59:23.5	HIP 89384	14.21
2026-04-05 00:00	18:15:14.64	-17:58:48.9	HIP 89384	15.54
2026-04-05 12:00	18:15:19.70	-17:58:14.4	HIP 89384	16.82
2026-04-06 00:00	18:15:24.50	-17:57:39.9	HIP 89384	18.07
2026-04-06 12:00	18:15:29.03	-17:57:05.6	HIP 89384	19.27
2026-04-07 00:00	18:15:33.29	-17:56:31.2	HIP 89384	20.42
2026-04-07 12:00	18:15:37.28	-17:55:57.0	HIP 89511	20.08
2026-04-08 00:00	18:15:41.01	-17:55:22.9	HIP 89511	19.33
2026-04-08 12:00	18:15:44.47	-17:54:48.8	HIP 89511	18.62
2026-04-09 00:00	18:15:47.66	-17:54:14.9	HIP 89511	17.94
2026-04-09 12:00	18:15:50.57	-17:53:41.0	HIP 89511	17.30
2026-04-10 00:00	18:15:53.22	-17:53:07.3	HIP 89511	16.68
2026-04-10 12:00	18:15:55.60	-17:52:33.7	HIP 89511	16.10
2026-04-11 00:00	18:15:57.70	-17:52:00.2	HIP 89511	15.53
2026-04-11 12:00	18:15:59.54	-17:51:26.8	HIP 89511	14.98
2026-04-12 00:00	18:16:01.10	-17:50:53.5	HIP 89511	14.44
2026-04-12 12:00	18:16:02.38	-17:50:20.4	HIP 89511	13.91
2026-04-13 00:00	18:16:03.39	-17:49:47.4	HIP 89511	13.38
2026-04-13 12:00	18:16:04.13	-17:49:14.5	HIP 89511	12.85
2026-04-14 00:00	18:16:04.59	-17:48:41.8	HIP 89511	12.33
2026-04-14 12:00	18:16:04.78	-17:48:09.3	HIP 89511	11.79
2026-04-15 00:00	18:16:04.69	-17:47:36.9	HIP 89511	11.26
2026-04-15 12:00	18:16:04.33	-17:47:04.6	HIP 89511	10.71
2026-04-16 00:00	18:16:03.69	-17:46:32.6	HIP 89511	10.16