メタデータ
| 項目 |
値 |
| Designation |
195P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-07-30T02:42:30.732480Z |
| Orbit solution date (soln_date, UTC) |
2026-08-07T12:42:22Z |
| Obs used |
1273 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
12.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-03-23.0000000 |
| e |
0.31334365 |
| q (au) |
4.461326 |
| a (au) |
6.497174 |
| i (deg) |
36.341689 |
| Ω (om, deg) |
243.095980 |
| ω (w, deg) |
249.508664 |
| M (ma, deg) |
243.643905 |
等級
散乱 + 全体線形
$$
M_a = (4.225 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.225 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2021-09-13 |
2022-11-27 |
-11.4196 |
+9.278 |
| 2022-11-27 |
2023-10-30 |
-4.4495 |
+3.723 |
| 2023-10-30 |
2025-05-13 |
+7.4071 |
-5.072 |
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) |
| 2026-09-20 00:00 |
11:29:59.48 |
-25:46:34.9 |
HIP 56130 |
4.96 |
| 2026-09-20 12:00 |
11:30:32.05 |
-25:49:02.6 |
HIP 56130 |
2.79 |
| 2026-09-21 00:00 |
11:31:04.61 |
-25:51:31.0 |
HIP 56130 |
10.52 |
| 2026-09-21 12:00 |
11:31:37.15 |
-25:54:00.1 |
HIP 56130 |
18.25 |
| 2026-09-22 00:00 |
11:32:09.67 |
-25:56:29.7 |
HIP 56130 |
25.97 |
| 2026-09-22 12:00 |
11:32:42.19 |
-25:59:00.0 |
HIP 56130 |
33.70 |
| 2026-09-23 00:00 |
11:33:14.69 |
-26:01:30.9 |
HIP 56390 |
30.46 |
| 2026-09-23 12:00 |
11:33:47.17 |
-26:04:02.5 |
HIP 56390 |
27.62 |
| 2026-09-24 00:00 |
11:34:19.63 |
-26:06:34.6 |
HIP 56390 |
26.77 |
| 2026-09-24 12:00 |
11:34:52.08 |
-26:09:07.4 |
HIP 56390 |
28.07 |
| 2026-09-25 00:00 |
11:35:24.52 |
-26:11:40.7 |
HIP 56390 |
31.26 |
| 2026-09-25 12:00 |
11:35:56.93 |
-26:14:14.7 |
HIP 56390 |
35.84 |
| 2026-09-26 00:00 |
11:36:29.33 |
-26:16:49.3 |
HIP 56600 |
39.90 |
| 2026-09-26 12:00 |
11:37:01.71 |
-26:19:24.4 |
HIP 56600 |
43.59 |
| 2026-09-27 00:00 |
11:37:34.07 |
-26:22:00.1 |
HIP 56846 |
36.98 |
| 2026-09-27 12:00 |
11:38:06.42 |
-26:24:36.5 |
HIP 56846 |
30.65 |
| 2026-09-28 00:00 |
11:38:38.74 |
-26:27:13.3 |
HIP 56846 |
25.08 |
| 2026-09-28 12:00 |
11:39:11.05 |
-26:29:50.8 |
HIP 56846 |
20.89 |
| 2026-09-29 00:00 |
11:39:43.33 |
-26:32:28.8 |
HIP 56846 |
19.01 |
| 2026-09-29 12:00 |
11:40:15.60 |
-26:35:07.4 |
HIP 57017 |
15.76 |
| 2026-09-30 00:00 |
11:40:47.84 |
-26:37:46.6 |
HIP 57017 |
8.09 |
| 2026-09-30 12:00 |
11:41:20.07 |
-26:40:26.3 |
HIP 57017 |
0.70 |
| 2026-10-01 00:00 |
11:41:52.27 |
-26:43:06.5 |
HIP 57017 |
7.30 |
| 2026-10-01 12:00 |
11:42:24.45 |
-26:45:47.4 |
HIP 57017 |
14.96 |
| 2026-10-02 00:00 |
11:42:56.61 |
-26:48:28.7 |
HIP 57017 |
22.62 |
| 2026-10-02 12:00 |
11:43:28.74 |
-26:51:10.6 |
HIP 57235 |
24.74 |
| 2026-10-03 00:00 |
11:44:00.85 |
-26:53:53.0 |
HIP 57235 |
25.91 |
| 2026-10-03 12:00 |
11:44:32.94 |
-26:56:36.0 |
HIP 57235 |
29.14 |
| 2026-10-04 00:00 |
11:45:05.01 |
-26:59:19.5 |
HIP 57243 |
28.42 |
| 2026-10-04 12:00 |
11:45:37.04 |
-27:02:03.5 |
HIP 57243 |
29.53 |
| 2026-10-05 00:00 |
11:46:09.06 |
-27:04:48.0 |
HIP 57243 |
32.44 |
| 2026-10-05 12:00 |
11:46:41.05 |
-27:07:33.0 |
HIP 57580 |
32.52 |
| 2026-10-06 00:00 |
11:47:13.01 |
-27:10:18.5 |
HIP 57627 |
30.76 |
| 2026-10-06 12:00 |
11:47:44.94 |
-27:13:04.6 |
HIP 57627 |
23.74 |
| 2026-10-07 00:00 |
11:48:16.85 |
-27:15:51.1 |
HIP 57627 |
17.24 |
| 2026-10-07 12:00 |
11:48:48.72 |
-27:18:38.1 |
HIP 57627 |
12.10 |
| 2026-10-08 00:00 |
11:49:20.57 |
-27:21:25.6 |
HIP 57627 |
10.53 |
| 2026-10-08 12:00 |
11:49:52.39 |
-27:24:13.6 |
HIP 57749 |
12.50 |
| 2026-10-09 00:00 |
11:50:24.18 |
-27:27:02.1 |
HIP 57749 |
10.76 |
| 2026-10-09 12:00 |
11:50:55.94 |
-27:29:51.0 |
HIP 57749 |
13.81 |
| 2026-10-10 00:00 |
11:51:27.66 |
-27:32:40.4 |
HIP 57881 |
11.89 |
| 2026-10-10 12:00 |
11:51:59.36 |
-27:35:30.2 |
HIP 57881 |
4.31 |
| 2026-10-11 00:00 |
11:52:31.02 |
-27:38:20.5 |
HIP 57881 |
3.25 |