465P/Hill
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) |
| 2026-02-03 00:00 |
08:40:45.64 |
-12:37:06.7 |
HIP 42509 |
13.77 |
| 2026-02-03 12:00 |
08:40:31.34 |
-12:35:59.1 |
HIP 42509 |
10.42 |
| 2026-02-04 00:00 |
08:40:17.07 |
-12:34:50.3 |
HIP 42509 |
7.37 |
| 2026-02-04 12:00 |
08:40:02.82 |
-12:33:40.1 |
HIP 42509 |
5.16 |
| 2026-02-05 00:00 |
08:39:48.61 |
-12:32:28.7 |
HIP 42509 |
5.06 |
| 2026-02-05 12:00 |
08:39:34.43 |
-12:31:16.0 |
HIP 42509 |
7.16 |
| 2026-02-06 00:00 |
08:39:20.30 |
-12:30:02.0 |
HIP 42509 |
10.17 |
| 2026-02-06 12:00 |
08:39:06.20 |
-12:28:46.8 |
HIP 42509 |
13.51 |
| 2026-02-07 00:00 |
08:38:52.14 |
-12:27:30.3 |
HIP 42328 |
16.32 |
| 2026-02-07 12:00 |
08:38:38.13 |
-12:26:12.6 |
HIP 42328 |
13.60 |
| 2026-02-08 00:00 |
08:38:24.16 |
-12:24:53.7 |
HIP 42328 |
11.44 |
| 2026-02-08 12:00 |
08:38:10.23 |
-12:23:33.6 |
HIP 42328 |
10.20 |
| 2026-02-09 00:00 |
08:37:56.36 |
-12:22:12.2 |
HIP 42328 |
10.20 |
| 2026-02-09 12:00 |
08:37:42.54 |
-12:20:49.7 |
HIP 42328 |
11.46 |
| 2026-02-10 00:00 |
08:37:28.77 |
-12:19:26.1 |
HIP 42328 |
13.61 |
| 2026-02-10 12:00 |
08:37:15.06 |
-12:18:01.2 |
HIP 42328 |
16.32 |
| 2026-02-11 00:00 |
08:37:01.40 |
-12:16:35.2 |
HIP 42328 |
19.34 |
| 2026-02-11 12:00 |
08:36:47.80 |
-12:15:08.1 |
HIP 42328 |
22.54 |
| 2026-02-12 00:00 |
08:36:34.27 |
-12:13:39.9 |
HIP 42118 |
23.26 |
| 2026-02-12 12:00 |
08:36:20.79 |
-12:12:10.5 |
HIP 42118 |
19.65 |
| 2026-02-13 00:00 |
08:36:07.39 |
-12:10:40.1 |
HIP 42118 |
16.05 |
| 2026-02-13 12:00 |
08:35:54.04 |
-12:09:08.5 |
HIP 42118 |
12.46 |
| 2026-02-14 00:00 |
08:35:40.77 |
-12:07:35.9 |
HIP 42118 |
8.87 |
| 2026-02-14 12:00 |
08:35:27.57 |
-12:06:02.3 |
HIP 42118 |
5.30 |
| 2026-02-15 00:00 |
08:35:14.44 |
-12:04:27.6 |
HIP 42118 |
1.79 |
| 2026-02-15 12:00 |
08:35:01.38 |
-12:02:51.8 |
HIP 42118 |
1.96 |
| 2026-02-16 00:00 |
08:34:48.41 |
-12:01:15.1 |
HIP 42118 |
5.46 |
| 2026-02-16 12:00 |
08:34:35.51 |
-11:59:37.4 |
HIP 42118 |
9.00 |
| 2026-02-17 00:00 |
08:34:22.69 |
-11:57:58.7 |
HIP 42118 |
12.53 |
| 2026-02-17 12:00 |
08:34:09.95 |
-11:56:19.0 |
HIP 42118 |
16.06 |
| 2026-02-18 00:00 |
08:33:57.29 |
-11:54:38.4 |
HIP 42118 |
19.57 |
| 2026-02-18 12:00 |
08:33:44.72 |
-11:52:56.8 |
HIP 42118 |
23.08 |
| 2026-02-19 00:00 |
08:33:32.24 |
-11:51:14.3 |
HIP 42118 |
26.57 |
| 2026-02-19 12:00 |
08:33:19.85 |
-11:49:31.0 |
HIP 42118 |
30.06 |
| 2026-02-20 00:00 |
08:33:07.54 |
-11:47:46.7 |
HIP 42118 |
33.53 |
| 2026-02-20 12:00 |
08:32:55.33 |
-11:46:01.6 |
HIP 41747 |
31.58 |
| 2026-02-21 00:00 |
08:32:43.22 |
-11:44:15.6 |
HIP 41747 |
28.80 |
| 2026-02-21 12:00 |
08:32:31.19 |
-11:42:28.8 |
HIP 41747 |
26.20 |
| 2026-02-22 00:00 |
08:32:19.27 |
-11:40:41.1 |
HIP 41747 |
23.84 |
| 2026-02-22 12:00 |
08:32:07.45 |
-11:38:52.7 |
HIP 41747 |
21.80 |
| 2026-02-23 00:00 |
08:31:55.72 |
-11:37:03.5 |
HIP 41747 |
20.15 |
| 2026-02-23 12:00 |
08:31:44.10 |
-11:35:13.5 |
HIP 41747 |
19.01 |
| 2026-02-24 00:00 |
08:31:32.58 |
-11:33:22.8 |
HIP 41747 |
18.45 |