メタデータ

項目	値
Designation	255P/Levy
Type	P
Perihelion (tp_cal, UTC)	2006-10-07T09:13:57.613440Z
Orbit solution date (soln_date, UTC)	2021-10-18T22:42:54Z
Obs used	503
NEO	Yes
M1	11.500
K1	38.000
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2007-12-22.0000000
e	0.67200978
q (au)	0.992018
a (au)	3.024534
i (deg)	18.333043
Ω (om, deg)	279.780048
ω (w, deg)	179.592955
M (ma, deg)	82.561191

等級

散乱 + 全体線形

$$ M_a = (20.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	20.000
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	19:57:02.33	-10:39:19.6	HIP 98059	21.69
2026-09-20 12:00	19:56:52.09	-10:40:28.3	HIP 98059	18.92
2026-09-21 00:00	19:56:42.14	-10:41:36.3	HIP 98059	16.23
2026-09-21 12:00	19:56:32.51	-10:42:43.8	HIP 98059	13.61
2026-09-22 00:00	19:56:23.18	-10:43:50.7	HIP 98059	11.07
2026-09-22 12:00	19:56:14.16	-10:44:57.0	HIP 98059	8.60
2026-09-23 00:00	19:56:05.44	-10:46:02.6	HIP 98059	6.22
2026-09-23 12:00	19:55:57.03	-10:47:07.7	HIP 98059	3.95
2026-09-24 00:00	19:55:48.93	-10:48:12.1	HIP 98059	1.90
2026-09-24 12:00	19:55:41.14	-10:49:15.8	HIP 98059	1.33
2026-09-25 00:00	19:55:33.66	-10:50:18.9	HIP 98059	3.03
2026-09-25 12:00	19:55:26.48	-10:51:21.4	HIP 98059	5.00
2026-09-26 00:00	19:55:19.61	-10:52:23.2	HIP 98059	6.94
2026-09-26 12:00	19:55:13.05	-10:53:24.3	HIP 98059	8.84
2026-09-27 00:00	19:55:06.80	-10:54:24.8	HIP 98059	10.67
2026-09-27 12:00	19:55:00.85	-10:55:24.6	HIP 98059	12.43
2026-09-28 00:00	19:54:55.21	-10:56:23.7	HIP 98059	14.13
2026-09-28 12:00	19:54:49.88	-10:57:22.1	HIP 98059	15.76
2026-09-29 00:00	19:54:44.86	-10:58:19.8	HIP 98059	17.32
2026-09-29 12:00	19:54:40.15	-10:59:16.8	HIP 98059	18.82
2026-09-30 00:00	19:54:35.74	-11:00:13.1	HIP 98059	20.25
2026-09-30 12:00	19:54:31.65	-11:01:08.7	HIP 98059	21.61
2026-10-01 00:00	19:54:27.85	-11:02:03.5	HIP 98059	22.90
2026-10-01 12:00	19:54:24.37	-11:02:57.7	HIP 98059	24.13
2026-10-02 00:00	19:54:21.19	-11:03:51.1	HIP 98059	25.30
2026-10-02 12:00	19:54:18.33	-11:04:43.7	HIP 98059	26.40
2026-10-03 00:00	19:54:15.76	-11:05:35.6	HIP 98059	27.44
2026-10-03 12:00	19:54:13.51	-11:06:26.8	HIP 97801	27.92
2026-10-04 00:00	19:54:11.56	-11:07:17.2	HIP 97801	27.76
2026-10-04 12:00	19:54:09.92	-11:08:06.8	HIP 97801	27.69
2026-10-05 00:00	19:54:08.58	-11:08:55.6	HIP 97801	27.72
2026-10-05 12:00	19:54:07.55	-11:09:43.7	HIP 97801	27.83
2026-10-06 00:00	19:54:06.83	-11:10:31.0	HIP 97801	28.03
2026-10-06 12:00	19:54:06.41	-11:11:17.5	HIP 97794	27.98
2026-10-07 00:00	19:54:06.29	-11:12:03.1	HIP 97794	27.67
2026-10-07 12:00	19:54:06.48	-11:12:48.0	HIP 97794	27.45
2026-10-08 00:00	19:54:06.98	-11:13:32.1	HIP 97794	27.33
2026-10-08 12:00	19:54:07.77	-11:14:15.3	HIP 97794	27.30
2026-10-09 00:00	19:54:08.87	-11:14:57.7	HIP 97794	27.37
2026-10-09 12:00	19:54:10.27	-11:15:39.3	HIP 97794	27.53
2026-10-10 00:00	19:54:11.98	-11:16:20.0	HIP 97794	27.79
2026-10-10 12:00	19:54:13.98	-11:17:00.0	HIP 97794	28.15
2026-10-11 00:00	19:54:16.28	-11:17:38.9	HIP 97794	28.60