メタデータ

項目	値
Designation	256P/LINEAR
Type	P
Perihelion (tp_cal, UTC)	2013-03-17T12:37:58.005120Z
Orbit solution date (soln_date, UTC)	2024-05-30T01:12:33Z
Obs used	270
NEO	-
M1	12.000
K1	13.250
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2015-02-12.0000000
e	0.41935612
q (au)	2.689114
a (au)	4.631263
i (deg)	27.631658
Ω (om, deg)	81.436538
ω (w, deg)	124.120383
M (ma, deg)	68.874689

等級

散乱 + 全体線形

$$ M_a = (10.702 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	10.702
n	6.000
gf	1.000
gb	-0.500
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)
2026-09-20 00:00	01:05:42.14	-28:12:49.8	HIP 5105	7.30
2026-09-20 12:00	01:05:26.89	-28:14:34.4	HIP 5105	4.64
2026-09-21 00:00	01:05:11.55	-28:16:17.7	HIP 5105	4.32
2026-09-21 12:00	01:04:56.15	-28:17:59.6	HIP 5105	6.69
2026-09-22 00:00	01:04:40.67	-28:19:40.2	HIP 5105	9.99
2026-09-22 12:00	01:04:25.12	-28:21:19.3	HIP 5105	13.57
2026-09-23 00:00	01:04:09.51	-28:22:57.1	HIP 5105	17.25
2026-09-23 12:00	01:03:53.83	-28:24:33.4	HIP 5105	20.98
2026-09-24 00:00	01:03:38.09	-28:26:08.3	HIP 5105	24.73
2026-09-24 12:00	01:03:22.29	-28:27:41.7	HIP 5105	28.51
2026-09-25 00:00	01:03:06.43	-28:29:13.7	HIP 5105	32.29
2026-09-25 12:00	01:02:50.52	-28:30:44.2	HIP 4767	30.52
2026-09-26 00:00	01:02:34.55	-28:32:13.2	HIP 4767	27.09
2026-09-26 12:00	01:02:18.53	-28:33:40.6	HIP 4767	23.79
2026-09-27 00:00	01:02:02.46	-28:35:06.6	HIP 4767	20.68
2026-09-27 12:00	01:01:46.35	-28:36:31.0	HIP 4767	17.87
2026-09-28 00:00	01:01:30.19	-28:37:53.8	HIP 4767	15.51
2026-09-28 12:00	01:01:13.99	-28:39:15.1	HIP 4767	13.83
2026-09-29 00:00	01:00:57.75	-28:40:34.8	HIP 4767	13.10
2026-09-29 12:00	01:00:41.48	-28:41:52.9	HIP 4767	13.47
2026-09-30 00:00	01:00:25.16	-28:43:09.4	HIP 4767	14.86
2026-09-30 12:00	01:00:08.82	-28:44:24.3	HIP 4767	17.02
2026-10-01 00:00	00:59:52.45	-28:45:37.6	HIP 4767	19.69
2026-10-01 12:00	00:59:36.04	-28:46:49.2	HIP 4767	22.70
2026-10-02 00:00	00:59:19.62	-28:47:59.2	HIP 4767	25.92
2026-10-02 12:00	00:59:03.17	-28:49:07.5	HIP 4767	29.29
2026-10-03 00:00	00:58:46.70	-28:50:14.1	HIP 4577	31.29
2026-10-03 12:00	00:58:30.21	-28:51:19.0	HIP 4401	29.67
2026-10-04 00:00	00:58:13.70	-28:52:22.3	HIP 4401	26.90
2026-10-04 12:00	00:57:57.18	-28:53:23.8	HIP 4401	24.37
2026-10-05 00:00	00:57:40.66	-28:54:23.6	HIP 4401	22.17
2026-10-05 12:00	00:57:24.12	-28:55:21.6	HIP 4401	20.41
2026-10-06 00:00	00:57:07.58	-28:56:17.9	HIP 4401	19.20
2026-10-06 12:00	00:56:51.04	-28:57:12.5	HIP 4401	18.65
2026-10-07 00:00	00:56:34.49	-28:58:05.2	HIP 4401	18.81
2026-10-07 12:00	00:56:17.95	-28:58:56.2	HIP 4401	19.66
2026-10-08 00:00	00:56:01.41	-28:59:45.4	HIP 4401	21.11
2026-10-08 12:00	00:55:44.88	-29:00:32.8	HIP 4401	23.04
2026-10-09 00:00	00:55:28.37	-29:01:18.5	HIP 4201	24.41
2026-10-09 12:00	00:55:11.86	-29:02:02.2	HIP 4201	20.99
2026-10-10 00:00	00:54:55.37	-29:02:44.2	HIP 4201	17.66
2026-10-10 12:00	00:54:38.90	-29:03:24.3	HIP 4201	14.50
2026-10-11 00:00	00:54:22.45	-29:04:02.6	HIP 4201	11.63