メタデータ
| 項目 |
値 |
| Designation |
420P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-06-29T08:33:30.939840Z |
| Orbit solution date (soln_date, UTC) |
2024-05-30T01:12:43Z |
| Obs used |
223 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-08-01.0000000 |
| e |
0.49432464 |
| q (au) |
2.787876 |
| a (au) |
5.513174 |
| i (deg) |
14.459998 |
| Ω (om, deg) |
174.032327 |
| ω (w, deg) |
157.611202 |
| M (ma, deg) |
141.513392 |
等級
散乱 + 全体線形
$$
M_a = (14.775 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.775 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.856 |
| k |
0.999 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:48:30.89 |
+07:43:08.9 |
HIP 43143 |
19.86 |
| 2026-09-20 12:00 |
08:48:43.91 |
+07:41:58.7 |
HIP 43349 |
18.75 |
| 2026-09-21 00:00 |
08:48:56.86 |
+07:40:48.5 |
HIP 43349 |
15.41 |
| 2026-09-21 12:00 |
08:49:09.74 |
+07:39:38.3 |
HIP 43349 |
12.13 |
| 2026-09-22 00:00 |
08:49:22.54 |
+07:38:28.2 |
HIP 43349 |
8.95 |
| 2026-09-22 12:00 |
08:49:35.27 |
+07:37:18.1 |
HIP 43349 |
6.01 |
| 2026-09-23 00:00 |
08:49:47.92 |
+07:36:08.1 |
HIP 43349 |
3.84 |
| 2026-09-23 12:00 |
08:50:00.49 |
+07:34:58.1 |
HIP 43349 |
3.96 |
| 2026-09-24 00:00 |
08:50:12.99 |
+07:33:48.1 |
HIP 43406 |
5.78 |
| 2026-09-24 12:00 |
08:50:25.41 |
+07:32:38.3 |
HIP 43406 |
5.31 |
| 2026-09-25 00:00 |
08:50:37.75 |
+07:31:28.5 |
HIP 43406 |
6.67 |
| 2026-09-25 12:00 |
08:50:50.02 |
+07:30:18.7 |
HIP 43406 |
9.06 |
| 2026-09-26 00:00 |
08:51:02.20 |
+07:29:09.0 |
HIP 43406 |
11.85 |
| 2026-09-26 12:00 |
08:51:14.31 |
+07:27:59.4 |
HIP 43406 |
14.81 |
| 2026-09-27 00:00 |
08:51:26.34 |
+07:26:49.9 |
HIP 43406 |
17.85 |
| 2026-09-27 12:00 |
08:51:38.29 |
+07:25:40.5 |
HIP 43406 |
20.91 |
| 2026-09-28 00:00 |
08:51:50.15 |
+07:24:31.1 |
HIP 43406 |
23.99 |
| 2026-09-28 12:00 |
08:52:01.94 |
+07:23:21.9 |
HIP 43406 |
27.07 |
| 2026-09-29 00:00 |
08:52:13.64 |
+07:22:12.7 |
HIP 43555 |
27.69 |
| 2026-09-29 12:00 |
08:52:25.26 |
+07:21:03.7 |
HIP 43555 |
26.66 |
| 2026-09-30 00:00 |
08:52:36.79 |
+07:19:54.7 |
HIP 43555 |
25.97 |
| 2026-09-30 12:00 |
08:52:48.25 |
+07:18:45.8 |
HIP 43555 |
25.63 |
| 2026-10-01 00:00 |
08:52:59.61 |
+07:17:37.1 |
HIP 43555 |
25.65 |
| 2026-10-01 12:00 |
08:53:10.90 |
+07:16:28.5 |
HIP 43555 |
26.01 |
| 2026-10-02 00:00 |
08:53:22.09 |
+07:15:19.9 |
HIP 43555 |
26.70 |
| 2026-10-02 12:00 |
08:53:33.20 |
+07:14:11.6 |
HIP 43555 |
27.69 |
| 2026-10-03 00:00 |
08:53:44.23 |
+07:13:03.3 |
HIP 43555 |
28.94 |
| 2026-10-03 12:00 |
08:53:55.16 |
+07:11:55.2 |
HIP 43832 |
28.60 |
| 2026-10-04 00:00 |
08:54:06.01 |
+07:10:47.2 |
HIP 43832 |
25.69 |
| 2026-10-04 12:00 |
08:54:16.77 |
+07:09:39.4 |
HIP 43832 |
22.79 |
| 2026-10-05 00:00 |
08:54:27.44 |
+07:08:31.7 |
HIP 43832 |
19.92 |
| 2026-10-05 12:00 |
08:54:38.02 |
+07:07:24.1 |
HIP 43832 |
17.07 |
| 2026-10-06 00:00 |
08:54:48.51 |
+07:06:16.8 |
HIP 43832 |
14.25 |
| 2026-10-06 12:00 |
08:54:58.90 |
+07:05:09.5 |
HIP 43832 |
11.45 |
| 2026-10-07 00:00 |
08:55:09.20 |
+07:04:02.5 |
HIP 43832 |
8.68 |
| 2026-10-07 12:00 |
08:55:19.41 |
+07:02:55.6 |
HIP 43832 |
5.95 |
| 2026-10-08 00:00 |
08:55:29.53 |
+07:01:48.9 |
HIP 43832 |
3.30 |
| 2026-10-08 12:00 |
08:55:39.55 |
+07:00:42.4 |
HIP 43832 |
1.20 |
| 2026-10-09 00:00 |
08:55:49.48 |
+06:59:36.1 |
HIP 43832 |
2.59 |
| 2026-10-09 12:00 |
08:55:59.31 |
+06:58:30.0 |
HIP 43832 |
5.13 |
| 2026-10-10 00:00 |
08:56:09.04 |
+06:57:24.1 |
HIP 43832 |
7.74 |
| 2026-10-10 12:00 |
08:56:18.68 |
+06:56:18.4 |
HIP 43832 |
10.34 |
| 2026-10-11 00:00 |
08:56:28.22 |
+06:55:12.9 |
HIP 43832 |
12.94 |