メタデータ

項目	値
Designation	216P/LINEAR
Type	P
Perihelion (tp_cal, UTC)	2016-05-30T22:32:33.506880Z
Orbit solution date (soln_date, UTC)	2024-07-07T00:42:15Z
Obs used	403
NEO	-
M1	10.700
K1	21.750
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2017-04-30.0000000
e	0.44545351
q (au)	2.148896
a (au)	3.875051
i (deg)	9.046729
Ω (om, deg)	359.865529
ω (w, deg)	151.513702
M (ma, deg)	43.163177

等級

散乱 + 全体線形

$$ M_a = (12.693 + 5.566\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	12.693
n	5.566
gf	1.000
gb	-0.943
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	20:45:52.38	-25:39:37.8	HIP 102485	23.59
2026-03-26 12:00	20:46:13.53	-25:38:45.5	HIP 102485	22.59
2026-03-27 00:00	20:46:34.55	-25:37:53.6	HIP 102485	22.62
2026-03-27 12:00	20:46:55.43	-25:37:02.3	HIP 102485	23.64
2026-03-28 00:00	20:47:16.19	-25:36:11.6	HIP 102485	25.52
2026-03-28 12:00	20:47:36.80	-25:35:21.4	HIP 102772	25.46
2026-03-29 00:00	20:47:57.29	-25:34:31.7	HIP 102772	21.91
2026-03-29 12:00	20:48:17.64	-25:33:42.6	HIP 102772	18.86
2026-03-30 00:00	20:48:37.85	-25:32:54.1	HIP 102772	16.60
2026-03-30 12:00	20:48:57.92	-25:32:06.2	HIP 102772	15.42
2026-03-31 00:00	20:49:17.86	-25:31:18.8	HIP 102772	15.56
2026-03-31 12:00	20:49:37.66	-25:30:32.0	HIP 102772	16.95
2026-04-01 00:00	20:49:57.32	-25:29:45.8	HIP 102928	17.49
2026-04-01 12:00	20:50:16.84	-25:29:00.2	HIP 102928	13.67
2026-04-02 00:00	20:50:36.22	-25:28:15.2	HIP 102928	10.38
2026-04-02 12:00	20:50:55.46	-25:27:30.8	HIP 102928	8.26
2026-04-03 00:00	20:51:14.56	-25:26:47.0	HIP 102928	8.20
2026-04-03 12:00	20:51:33.51	-25:26:03.8	HIP 102928	10.20
2026-04-04 00:00	20:51:52.32	-25:25:21.2	HIP 102928	13.32
2026-04-04 12:00	20:52:10.99	-25:24:39.3	HIP 102928	16.94
2026-04-05 00:00	20:52:29.52	-25:23:58.0	HIP 102928	20.78
2026-04-05 12:00	20:52:47.89	-25:23:17.3	HIP 103192	24.44
2026-04-06 00:00	20:53:06.12	-25:22:37.2	HIP 103192	21.25
2026-04-06 12:00	20:53:24.21	-25:21:57.8	HIP 103192	18.47
2026-04-07 00:00	20:53:42.14	-25:21:19.1	HIP 103192	16.28
2026-04-07 12:00	20:53:59.93	-25:20:41.0	HIP 103192	14.92
2026-04-08 00:00	20:54:17.56	-25:20:03.5	HIP 103192	14.60
2026-04-08 12:00	20:54:35.05	-25:19:26.7	HIP 103192	15.34
2026-04-09 00:00	20:54:52.38	-25:18:50.6	HIP 103192	17.00
2026-04-09 12:00	20:55:09.56	-25:18:15.2	HIP 103192	19.31
2026-04-10 00:00	20:55:26.59	-25:17:40.4	HIP 103192	22.05
2026-04-10 12:00	20:55:43.46	-25:17:06.4	HIP 103192	25.06
2026-04-11 00:00	20:56:00.18	-25:16:33.0	HIP 103192	28.24
2026-04-11 12:00	20:56:16.74	-25:16:00.3	HIP 103462	29.92
2026-04-12 00:00	20:56:33.15	-25:15:28.4	HIP 103462	27.23
2026-04-12 12:00	20:56:49.39	-25:14:57.1	HIP 103462	24.85
2026-04-13 00:00	20:57:05.48	-25:14:26.5	HIP 103462	22.84
2026-04-13 12:00	20:57:21.41	-25:13:56.7	HIP 103462	21.31
2026-04-14 00:00	20:57:37.18	-25:13:27.6	HIP 103462	20.33
2026-04-14 12:00	20:57:52.78	-25:12:59.2	HIP 103572	19.09
2026-04-15 00:00	20:58:08.22	-25:12:31.6	HIP 103572	16.48
2026-04-15 12:00	20:58:23.50	-25:12:04.7	HIP 103572	14.28
2026-04-16 00:00	20:58:38.62	-25:11:38.5	HIP 103572	12.68