メタデータ

項目	値
Designation	277P/LINEAR
Type	P
Perihelion (tp_cal, UTC)	2013-06-04T19:48:10.031040Z
Orbit solution date (soln_date, UTC)	2021-05-02T23:43:01Z
Obs used	828
NEO	-
M1	11.800
K1	19.500
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2016-09-16.0000000
e	0.50379346
q (au)	1.914197
a (au)	3.857662
i (deg)	16.748332
Ω (om, deg)	276.352145
ω (w, deg)	152.176271
M (ma, deg)	155.991309

等級

散乱 + 全体線形

$$ M_a = (12.075 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	12.075
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	18:27:02.94	-19:20:22.8	HIP 90259	31.51
2026-09-20 12:00	18:27:07.18	-19:20:03.6	HIP 90259	32.55
2026-09-21 00:00	18:27:11.64	-19:19:44.4	HIP 90259	33.64
2026-09-21 12:00	18:27:16.32	-19:19:25.1	HIP 90259	34.78
2026-09-22 00:00	18:27:21.23	-19:19:05.7	HIP 90259	35.97
2026-09-22 12:00	18:27:26.37	-19:18:46.3	HIP 90259	37.21
2026-09-23 00:00	18:27:31.72	-19:18:26.7	HIP 90259	38.50
2026-09-23 12:00	18:27:37.30	-19:18:07.1	HIP 90259	39.84
2026-09-24 00:00	18:27:43.09	-19:17:47.3	HIP 90259	41.23
2026-09-24 12:00	18:27:49.11	-19:17:27.5	HIP 90679	40.50
2026-09-25 00:00	18:27:55.34	-19:17:07.6	HIP 90679	39.52
2026-09-25 12:00	18:28:01.79	-19:16:47.6	HIP 90679	38.54
2026-09-26 00:00	18:28:08.46	-19:16:27.5	HIP 90679	37.56
2026-09-26 12:00	18:28:15.35	-19:16:07.2	HIP 90679	36.59
2026-09-27 00:00	18:28:22.45	-19:15:46.9	HIP 90679	35.64
2026-09-27 12:00	18:28:29.77	-19:15:26.4	HIP 90679	34.71
2026-09-28 00:00	18:28:37.30	-19:15:05.9	HIP 90679	33.82
2026-09-28 12:00	18:28:45.04	-19:14:45.2	HIP 90679	32.97
2026-09-29 00:00	18:28:53.00	-19:14:24.4	HIP 90679	32.18
2026-09-29 12:00	18:29:01.16	-19:14:03.5	HIP 90679	31.47
2026-09-30 00:00	18:29:09.54	-19:13:42.4	HIP 90679	30.84
2026-09-30 12:00	18:29:18.13	-19:13:21.3	HIP 90801	30.02
2026-10-01 00:00	18:29:26.93	-19:13:00.0	HIP 90801	27.91
2026-10-01 12:00	18:29:35.93	-19:12:38.5	HIP 90801	25.76
2026-10-02 00:00	18:29:45.15	-19:12:16.9	HIP 90801	23.55
2026-10-02 12:00	18:29:54.57	-19:11:55.2	HIP 90801	21.30
2026-10-03 00:00	18:30:04.20	-19:11:33.3	HIP 90801	19.00
2026-10-03 12:00	18:30:14.04	-19:11:11.3	HIP 90801	16.65
2026-10-04 00:00	18:30:24.08	-19:10:49.1	HIP 90801	14.26
2026-10-04 12:00	18:30:34.32	-19:10:26.8	HIP 90801	11.82
2026-10-05 00:00	18:30:44.77	-19:10:04.3	HIP 90801	9.33
2026-10-05 12:00	18:30:55.43	-19:09:41.6	HIP 90801	6.80
2026-10-06 00:00	18:31:06.28	-19:09:18.8	HIP 90801	4.24
2026-10-06 12:00	18:31:17.34	-19:08:55.7	HIP 90801	1.73
2026-10-07 00:00	18:31:28.59	-19:08:32.6	HIP 90801	1.42
2026-10-07 12:00	18:31:40.05	-19:08:09.2	HIP 90836	3.20
2026-10-08 00:00	18:31:51.71	-19:07:45.6	HIP 90836	0.46
2026-10-08 12:00	18:32:03.56	-19:07:21.8	HIP 90870	2.26
2026-10-09 00:00	18:32:15.61	-19:06:57.9	HIP 90870	0.76
2026-10-09 12:00	18:32:27.86	-19:06:33.7	HIP 90870	3.59
2026-10-10 00:00	18:32:40.31	-19:06:09.4	HIP 90870	6.55
2026-10-10 12:00	18:32:52.94	-19:05:44.8	HIP 90900	9.28
2026-10-11 00:00	18:33:05.78	-19:05:20.0	HIP 90900	11.11