メタデータ
| 項目 |
値 |
| Designation |
195P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-07-30T11:12:59.307840Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:36Z |
| Obs used |
1176 |
| 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) |
2019-10-20.0000000 |
| e |
0.31347528 |
| q (au) |
4.459217 |
| a (au) |
6.495349 |
| i (deg) |
36.342644 |
| Ω (om, deg) |
243.089180 |
| ω (w, deg) |
249.568448 |
| M (ma, deg) |
234.345217 |
等級
散乱 + 全体線形
$$
M_a = (4.203 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.203 |
| n |
6.000 |
| gf |
0.975 |
| gb |
-0.871 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
-11.3967 |
+9.280 |
| 2022-11-27 |
2023-10-30 |
-4.2313 |
+3.574 |
| 2023-10-30 |
2025-05-13 |
+7.0564 |
-4.819 |
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) |
| 2026-03-26 00:00 |
09:20:08.10 |
-31:06:54.1 |
HIP 45895 |
24.95 |
| 2026-03-26 12:00 |
09:20:02.15 |
-31:03:22.5 |
HIP 45895 |
23.43 |
| 2026-03-27 00:00 |
09:19:56.43 |
-30:59:49.9 |
HIP 45895 |
22.38 |
| 2026-03-27 12:00 |
09:19:50.95 |
-30:56:16.3 |
HIP 45895 |
21.88 |
| 2026-03-28 00:00 |
09:19:45.70 |
-30:52:41.9 |
HIP 45895 |
21.97 |
| 2026-03-28 12:00 |
09:19:40.68 |
-30:49:06.6 |
HIP 45895 |
22.64 |
| 2026-03-29 00:00 |
09:19:35.90 |
-30:45:30.5 |
HIP 45895 |
23.83 |
| 2026-03-29 12:00 |
09:19:31.35 |
-30:41:53.6 |
HIP 45895 |
25.48 |
| 2026-03-30 00:00 |
09:19:27.04 |
-30:38:15.9 |
HIP 45895 |
27.50 |
| 2026-03-30 12:00 |
09:19:22.97 |
-30:34:37.5 |
HIP 45895 |
29.82 |
| 2026-03-31 00:00 |
09:19:19.13 |
-30:30:58.4 |
HIP 45895 |
32.37 |
| 2026-03-31 12:00 |
09:19:15.54 |
-30:27:18.7 |
HIP 45895 |
35.10 |
| 2026-04-01 00:00 |
09:19:12.18 |
-30:23:38.3 |
HIP 45895 |
37.97 |
| 2026-04-01 12:00 |
09:19:09.05 |
-30:19:57.3 |
HIP 45514 |
36.13 |
| 2026-04-02 00:00 |
09:19:06.17 |
-30:16:15.8 |
HIP 45736 |
33.35 |
| 2026-04-02 12:00 |
09:19:03.52 |
-30:12:33.7 |
HIP 45736 |
29.78 |
| 2026-04-03 00:00 |
09:19:01.12 |
-30:08:51.1 |
HIP 45736 |
26.23 |
| 2026-04-03 12:00 |
09:18:58.95 |
-30:05:08.1 |
HIP 45736 |
22.73 |
| 2026-04-04 00:00 |
09:18:57.02 |
-30:01:24.6 |
HIP 45736 |
19.30 |
| 2026-04-04 12:00 |
09:18:55.34 |
-29:57:40.7 |
HIP 45736 |
15.98 |
| 2026-04-05 00:00 |
09:18:53.89 |
-29:53:56.4 |
HIP 45736 |
12.86 |
| 2026-04-05 12:00 |
09:18:52.68 |
-29:50:11.8 |
HIP 45736 |
10.15 |
| 2026-04-06 00:00 |
09:18:51.71 |
-29:46:26.9 |
HIP 45736 |
8.23 |
| 2026-04-06 12:00 |
09:18:50.98 |
-29:42:41.7 |
HIP 45736 |
7.74 |
| 2026-04-07 00:00 |
09:18:50.50 |
-29:38:56.2 |
HIP 45736 |
8.92 |
| 2026-04-07 12:00 |
09:18:50.25 |
-29:35:10.6 |
HIP 45736 |
11.26 |
| 2026-04-08 00:00 |
09:18:50.24 |
-29:31:24.7 |
HIP 45736 |
14.19 |
| 2026-04-08 12:00 |
09:18:50.47 |
-29:27:38.7 |
HIP 45601 |
15.51 |
| 2026-04-09 00:00 |
09:18:50.95 |
-29:23:52.5 |
HIP 45601 |
15.42 |
| 2026-04-09 12:00 |
09:18:51.66 |
-29:20:06.2 |
HIP 45601 |
16.28 |
| 2026-04-10 00:00 |
09:18:52.61 |
-29:16:19.9 |
HIP 45601 |
17.96 |
| 2026-04-10 12:00 |
09:18:53.81 |
-29:12:33.5 |
HIP 45601 |
20.26 |
| 2026-04-11 00:00 |
09:18:55.24 |
-29:08:47.2 |
HIP 45805 |
19.92 |
| 2026-04-11 12:00 |
09:18:56.91 |
-29:05:00.8 |
HIP 45805 |
19.70 |
| 2026-04-12 00:00 |
09:18:58.82 |
-29:01:14.5 |
HIP 45805 |
20.15 |
| 2026-04-12 12:00 |
09:19:00.98 |
-28:57:28.2 |
HIP 45805 |
21.23 |
| 2026-04-13 00:00 |
09:19:03.37 |
-28:53:42.1 |
HIP 45805 |
22.85 |
| 2026-04-13 12:00 |
09:19:06.00 |
-28:49:56.1 |
HIP 45842 |
22.23 |
| 2026-04-14 00:00 |
09:19:08.86 |
-28:46:10.3 |
HIP 45842 |
21.64 |
| 2026-04-14 12:00 |
09:19:11.97 |
-28:42:24.6 |
HIP 45842 |
21.65 |
| 2026-04-15 00:00 |
09:19:15.31 |
-28:38:39.2 |
HIP 45842 |
22.28 |
| 2026-04-15 12:00 |
09:19:18.90 |
-28:34:54.1 |
HIP 45842 |
23.48 |
| 2026-04-16 00:00 |
09:19:22.72 |
-28:31:09.2 |
HIP 45716 |
22.89 |