メタデータ

項目	値
Designation	465P/Hill
Type	P
Perihelion (tp_cal, UTC)	2008-08-18T17:57:24.065280Z
Orbit solution date (soln_date, UTC)	2024-07-13T19:12:23Z
Obs used	706
NEO	-
M1	6.900
K1	25.250
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2011-07-24.0000000
e	0.61380782
q (au)	2.322142
a (au)	6.012919
i (deg)	25.854343
Ω (om, deg)	217.938849
ω (w, deg)	141.510289
M (ma, deg)	71.475305

等級

散乱 + 全体線形

$$ M_a = (10.276 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	10.276
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

残差 (区間線形)

$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$

開始日 (UTC)	終了日 (UTC)	a	b
2023-06-08	2024-01-05	+9.7551	-4.150

log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)

天体暦

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-06-01 00:00	08:35:59.30	-06:11:10.0	HIP 42292	26.62
2026-06-01 12:00	08:36:12.05	-06:10:34.9	HIP 42292	24.70
2026-06-02 00:00	08:36:24.88	-06:10:00.7	HIP 42292	23.06
2026-06-02 12:00	08:36:37.79	-06:09:27.3	HIP 42292	21.76
2026-06-03 00:00	08:36:50.78	-06:08:54.8	HIP 42292	20.86
2026-06-03 12:00	08:37:03.83	-06:08:23.2	HIP 42292	20.44
2026-06-04 00:00	08:37:16.97	-06:07:52.5	HIP 42292	20.52
2026-06-04 12:00	08:37:30.17	-06:07:22.7	HIP 42292	21.12
2026-06-05 00:00	08:37:43.45	-06:06:53.7	HIP 42408	19.22
2026-06-05 12:00	08:37:56.80	-06:06:25.7	HIP 42408	16.20
2026-06-06 00:00	08:38:10.22	-06:05:58.5	HIP 42408	13.33
2026-06-06 12:00	08:38:23.71	-06:05:32.2	HIP 42408	10.76
2026-06-07 00:00	08:38:37.28	-06:05:06.8	HIP 42408	8.77
2026-06-07 12:00	08:38:50.91	-06:04:42.2	HIP 42408	7.84
2026-06-08 00:00	08:39:04.61	-06:04:18.5	HIP 42408	8.34
2026-06-08 12:00	08:39:18.38	-06:03:55.8	HIP 42408	10.08
2026-06-09 00:00	08:39:32.21	-06:03:33.9	HIP 42408	12.57
2026-06-09 12:00	08:39:46.12	-06:03:12.8	HIP 42408	15.46
2026-06-10 00:00	08:40:00.09	-06:02:52.7	HIP 42408	18.57
2026-06-10 12:00	08:40:14.12	-06:02:33.4	HIP 42408	21.82
2026-06-11 00:00	08:40:28.22	-06:02:15.1	HIP 42408	25.15
2026-06-11 12:00	08:40:42.39	-06:01:57.6	HIP 42408	28.55
2026-06-12 00:00	08:40:56.62	-06:01:40.9	HIP 42674	28.38
2026-06-12 12:00	08:41:10.91	-06:01:25.2	HIP 42674	26.64
2026-06-13 00:00	08:41:25.26	-06:01:10.3	HIP 42674	25.31
2026-06-13 12:00	08:41:39.67	-06:00:56.4	HIP 42674	24.44
2026-06-14 00:00	08:41:54.15	-06:00:43.3	HIP 42674	24.10
2026-06-14 12:00	08:42:08.69	-06:00:31.0	HIP 42674	24.31
2026-06-15 00:00	08:42:23.28	-06:00:19.7	HIP 42674	25.06
2026-06-15 12:00	08:42:37.94	-06:00:09.2	HIP 42674	26.33
2026-06-16 00:00	08:42:52.65	-05:59:59.6	HIP 42674	28.03
2026-06-16 12:00	08:43:07.42	-05:59:50.9	HIP 42674	30.11
2026-06-17 00:00	08:43:22.24	-05:59:43.0	HIP 42674	32.49
2026-06-17 12:00	08:43:37.12	-05:59:36.0	HIP 42674	35.11
2026-06-18 00:00	08:43:52.06	-05:59:29.9	HIP 42674	37.94
2026-06-18 12:00	08:44:07.05	-05:59:24.7	HIP 42674	40.93
2026-06-19 00:00	08:44:22.09	-05:59:20.3	HIP 43019	41.03
2026-06-19 12:00	08:44:37.18	-05:59:16.7	HIP 43019	38.97
2026-06-20 00:00	08:44:52.33	-05:59:14.1	HIP 43019	37.16
2026-06-20 12:00	08:45:07.53	-05:59:12.3	HIP 43019	35.64
2026-06-21 00:00	08:45:22.78	-05:59:11.3	HIP 43019	34.45
2026-06-21 12:00	08:45:38.07	-05:59:11.2	HIP 43019	33.63
2026-06-22 00:00	08:45:53.42	-05:59:12.0	HIP 43019	33.21