195P/Hill
メタデータ
| 項目 |
値 |
| Designation |
195P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-07-30T11:33:39.890880Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:54Z |
| Obs used |
1041 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
12.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-01-27.0000000 |
| e |
0.31392225 |
| q (au) |
4.453873 |
| a (au) |
6.491791 |
| i (deg) |
36.343096 |
| Ω (om, deg) |
243.083513 |
| ω (w, deg) |
249.661338 |
| M (ma, deg) |
218.390696 |
等級
散乱 + 全体線形
$$
M_a = (4.191 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.191 |
| 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 |
-11.4117 |
+9.305 |
| 2022-11-27 |
2023-10-30 |
-4.3773 |
+3.700 |
| 2023-10-30 |
2025-05-13 |
+7.2903 |
-4.961 |
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 |
09:44:03.53 |
-34:03:56.7 |
HIP 47766 |
13.35 |
| 2026-02-03 12:00 |
09:43:46.95 |
-34:04:37.2 |
HIP 47766 |
15.12 |
| 2026-02-04 00:00 |
09:43:30.29 |
-34:05:14.5 |
HIP 47766 |
17.38 |
| 2026-02-04 12:00 |
09:43:13.56 |
-34:05:48.6 |
HIP 47766 |
19.98 |
| 2026-02-05 00:00 |
09:42:56.76 |
-34:06:19.5 |
HIP 47766 |
22.79 |
| 2026-02-05 12:00 |
09:42:39.90 |
-34:06:47.2 |
HIP 47766 |
25.76 |
| 2026-02-06 00:00 |
09:42:22.98 |
-34:07:11.8 |
HIP 47766 |
28.83 |
| 2026-02-06 12:00 |
09:42:06.00 |
-34:07:33.1 |
HIP 47448 |
25.97 |
| 2026-02-07 00:00 |
09:41:48.98 |
-34:07:51.2 |
HIP 47448 |
22.66 |
| 2026-02-07 12:00 |
09:41:31.90 |
-34:08:06.1 |
HIP 47448 |
19.46 |
| 2026-02-08 00:00 |
09:41:14.77 |
-34:08:17.8 |
HIP 47448 |
16.42 |
| 2026-02-08 12:00 |
09:40:57.61 |
-34:08:26.2 |
HIP 47448 |
13.66 |
| 2026-02-09 00:00 |
09:40:40.41 |
-34:08:31.5 |
HIP 47448 |
11.38 |
| 2026-02-09 12:00 |
09:40:23.17 |
-34:08:33.5 |
HIP 47448 |
9.95 |
| 2026-02-10 00:00 |
09:40:05.90 |
-34:08:32.3 |
HIP 47448 |
9.73 |
| 2026-02-10 12:00 |
09:39:48.61 |
-34:08:27.9 |
HIP 47448 |
10.82 |
| 2026-02-11 00:00 |
09:39:31.30 |
-34:08:20.2 |
HIP 47448 |
12.89 |
| 2026-02-11 12:00 |
09:39:13.97 |
-34:08:09.4 |
HIP 47448 |
15.56 |
| 2026-02-12 00:00 |
09:38:56.62 |
-34:07:55.4 |
HIP 47448 |
18.57 |
| 2026-02-12 12:00 |
09:38:39.27 |
-34:07:38.1 |
HIP 47448 |
21.79 |
| 2026-02-13 00:00 |
09:38:21.91 |
-34:07:17.7 |
HIP 47448 |
25.13 |
| 2026-02-13 12:00 |
09:38:04.55 |
-34:06:54.0 |
HIP 47448 |
28.57 |
| 2026-02-14 00:00 |
09:37:47.19 |
-34:06:27.2 |
HIP 47448 |
32.06 |
| 2026-02-14 12:00 |
09:37:29.84 |
-34:05:57.1 |
HIP 47144 |
32.81 |
| 2026-02-15 00:00 |
09:37:12.49 |
-34:05:24.0 |
HIP 47144 |
30.97 |
| 2026-02-15 12:00 |
09:36:55.17 |
-34:04:47.6 |
HIP 47144 |
29.41 |
| 2026-02-16 00:00 |
09:36:37.86 |
-34:04:08.1 |
HIP 47020 |
27.45 |
| 2026-02-16 12:00 |
09:36:20.57 |
-34:03:25.4 |
HIP 47020 |
25.37 |
| 2026-02-17 00:00 |
09:36:03.31 |
-34:02:39.6 |
HIP 47020 |
23.72 |
| 2026-02-17 12:00 |
09:35:46.09 |
-34:01:50.7 |
HIP 47020 |
22.59 |
| 2026-02-18 00:00 |
09:35:28.89 |
-34:00:58.7 |
HIP 47020 |
22.06 |
| 2026-02-18 12:00 |
09:35:11.74 |
-34:00:03.5 |
HIP 47020 |
22.19 |
| 2026-02-19 00:00 |
09:34:54.63 |
-33:59:05.3 |
HIP 47020 |
22.96 |
| 2026-02-19 12:00 |
09:34:37.57 |
-33:58:04.0 |
HIP 47020 |
24.32 |
| 2026-02-20 00:00 |
09:34:20.56 |
-33:56:59.7 |
HIP 46833 |
22.04 |
| 2026-02-20 12:00 |
09:34:03.61 |
-33:55:52.4 |
HIP 46833 |
18.76 |
| 2026-02-21 00:00 |
09:33:46.72 |
-33:54:42.0 |
HIP 46833 |
15.70 |
| 2026-02-21 12:00 |
09:33:29.89 |
-33:53:28.6 |
HIP 46833 |
13.01 |
| 2026-02-22 00:00 |
09:33:13.13 |
-33:52:12.3 |
HIP 46833 |
10.96 |
| 2026-02-22 12:00 |
09:32:56.44 |
-33:50:52.9 |
HIP 46833 |
9.98 |
| 2026-02-23 00:00 |
09:32:39.82 |
-33:49:30.7 |
HIP 46833 |
10.36 |
| 2026-02-23 12:00 |
09:32:23.29 |
-33:48:05.5 |
HIP 46833 |
11.99 |
| 2026-02-24 00:00 |
09:32:06.84 |
-33:46:37.5 |
HIP 46833 |
14.45 |