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)
2026-05-12 00:00	21:07:38.80	-25:07:28.6	HIP 104234	10.02
2026-05-12 12:00	21:07:44.11	-25:07:46.3	HIP 104234	11.10
2026-05-13 00:00	21:07:49.22	-25:08:04.9	HIP 104234	12.18
2026-05-13 12:00	21:07:54.12	-25:08:24.5	HIP 104234	13.25
2026-05-14 00:00	21:07:58.82	-25:08:44.8	HIP 104234	14.31
2026-05-14 12:00	21:08:03.31	-25:09:06.1	HIP 104234	15.34
2026-05-15 00:00	21:08:07.59	-25:09:28.3	HIP 104234	16.35
2026-05-15 12:00	21:08:11.66	-25:09:51.3	HIP 104234	17.33
2026-05-16 00:00	21:08:15.52	-25:10:15.3	HIP 104234	18.28
2026-05-16 12:00	21:08:19.18	-25:10:40.1	HIP 104234	19.20
2026-05-17 00:00	21:08:22.62	-25:11:05.8	HIP 104234	20.08
2026-05-17 12:00	21:08:25.85	-25:11:32.3	HIP 104234	20.94
2026-05-18 00:00	21:08:28.87	-25:11:59.8	HIP 104234	21.76
2026-05-18 12:00	21:08:31.68	-25:12:28.1	HIP 104234	22.55
2026-05-19 00:00	21:08:34.28	-25:12:57.3	HIP 104234	23.31
2026-05-19 12:00	21:08:36.66	-25:13:27.3	HIP 104234	24.03
2026-05-20 00:00	21:08:38.83	-25:13:58.2	HIP 104234	24.72
2026-05-20 12:00	21:08:40.79	-25:14:30.0	HIP 104234	25.39
2026-05-21 00:00	21:08:42.53	-25:15:02.6	HIP 104482	25.45
2026-05-21 12:00	21:08:44.06	-25:15:36.1	HIP 104482	24.80
2026-05-22 00:00	21:08:45.38	-25:16:10.5	HIP 104482	24.18
2026-05-22 12:00	21:08:46.48	-25:16:45.7	HIP 104482	23.58
2026-05-23 00:00	21:08:47.37	-25:17:21.7	HIP 104482	23.01
2026-05-23 12:00	21:08:48.04	-25:17:58.6	HIP 104482	22.47
2026-05-24 00:00	21:08:48.50	-25:18:36.3	HIP 104482	21.95
2026-05-24 12:00	21:08:48.74	-25:19:14.8	HIP 104482	21.47
2026-05-25 00:00	21:08:48.77	-25:19:54.2	HIP 104482	21.02
2026-05-25 12:00	21:08:48.59	-25:20:34.4	HIP 104482	20.62
2026-05-26 00:00	21:08:48.18	-25:21:15.4	HIP 104482	20.26
2026-05-26 12:00	21:08:47.57	-25:21:57.2	HIP 104482	19.94
2026-05-27 00:00	21:08:46.73	-25:22:39.9	HIP 104482	19.68
2026-05-27 12:00	21:08:45.68	-25:23:23.3	HIP 104482	19.48
2026-05-28 00:00	21:08:44.42	-25:24:07.5	HIP 104482	19.34
2026-05-28 12:00	21:08:42.93	-25:24:52.6	HIP 104482	19.27
2026-05-29 00:00	21:08:41.23	-25:25:38.4	HIP 104482	19.27
2026-05-29 12:00	21:08:39.32	-25:26:25.0	HIP 104482	19.35
2026-05-30 00:00	21:08:37.19	-25:27:12.4	HIP 104482	19.52
2026-05-30 12:00	21:08:34.84	-25:28:00.6	HIP 104482	19.76
2026-05-31 00:00	21:08:32.27	-25:28:49.5	HIP 104482	20.10
2026-05-31 12:00	21:08:29.49	-25:29:39.2	HIP 104482	20.52
2026-06-01 00:00	21:08:26.49	-25:30:29.7	HIP 104482	21.03
2026-06-01 12:00	21:08:23.27	-25:31:20.9	HIP 104222	20.35
2026-06-02 00:00	21:08:19.84	-25:32:12.9	HIP 104222	19.49