メタデータ
| 項目 |
値 |
| Designation |
C/2009 U3 (Hill) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-03-20T06:06:49.440960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:36Z |
| Obs used |
602 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-01-01.0000000 |
| e |
0.99157651 |
| q (au) |
1.414425 |
| a (au) |
167.914294 |
| i (deg) |
51.260767 |
| Ω (om, deg) |
49.322883 |
| ω (w, deg) |
77.701400 |
| M (ma, deg) |
359.964553 |
等級
散乱 + 全体線形
$$
M_a = (13.668 + 5.161\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.668 |
| n |
5.161 |
| gf |
1.000 |
| gb |
-0.772 |
| k |
0.984 |
| 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 |
| 2009-10-20 |
2009-11-16 |
-11.6924 |
+4.120 |
| 2009-11-16 |
2009-12-24 |
+7.8024 |
-2.354 |
| 2009-12-24 |
2010-01-26 |
-15.1069 |
+3.691 |
| 2010-01-26 |
2010-03-19 |
+34.3839 |
-6.645 |
| 2010-03-24 |
2010-05-14 |
+6.6087 |
-1.956 |
| 2010-05-14 |
2010-06-18 |
-14.3862 |
+3.611 |
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 |
18:24:05.24 |
-63:13:10.6 |
HIP 90155 |
10.05 |
| 2026-03-26 12:00 |
18:24:05.69 |
-63:13:45.9 |
HIP 90155 |
9.48 |
| 2026-03-27 00:00 |
18:24:06.07 |
-63:14:21.2 |
HIP 90155 |
8.90 |
| 2026-03-27 12:00 |
18:24:06.38 |
-63:14:56.6 |
HIP 90155 |
8.33 |
| 2026-03-28 00:00 |
18:24:06.63 |
-63:15:31.9 |
HIP 90155 |
7.75 |
| 2026-03-28 12:00 |
18:24:06.81 |
-63:16:07.3 |
HIP 90155 |
7.18 |
| 2026-03-29 00:00 |
18:24:06.92 |
-63:16:42.7 |
HIP 90155 |
6.61 |
| 2026-03-29 12:00 |
18:24:06.96 |
-63:17:18.1 |
HIP 90155 |
6.04 |
| 2026-03-30 00:00 |
18:24:06.94 |
-63:17:53.5 |
HIP 90155 |
5.47 |
| 2026-03-30 12:00 |
18:24:06.85 |
-63:18:29.0 |
HIP 90155 |
4.90 |
| 2026-03-31 00:00 |
18:24:06.69 |
-63:19:04.4 |
HIP 90155 |
4.34 |
| 2026-03-31 12:00 |
18:24:06.46 |
-63:19:39.8 |
HIP 90155 |
3.78 |
| 2026-04-01 00:00 |
18:24:06.17 |
-63:20:15.3 |
HIP 90155 |
3.23 |
| 2026-04-01 12:00 |
18:24:05.81 |
-63:20:50.7 |
HIP 90155 |
2.70 |
| 2026-04-02 00:00 |
18:24:05.38 |
-63:21:26.1 |
HIP 90155 |
2.19 |
| 2026-04-02 12:00 |
18:24:04.89 |
-63:22:01.5 |
HIP 90155 |
1.73 |
| 2026-04-03 00:00 |
18:24:04.33 |
-63:22:36.9 |
HIP 90155 |
1.37 |
| 2026-04-03 12:00 |
18:24:03.70 |
-63:23:12.3 |
HIP 90155 |
1.19 |
| 2026-04-04 00:00 |
18:24:03.00 |
-63:23:47.7 |
HIP 90155 |
1.30 |
| 2026-04-04 12:00 |
18:24:02.23 |
-63:24:23.0 |
HIP 90155 |
1.62 |
| 2026-04-05 00:00 |
18:24:01.40 |
-63:24:58.3 |
HIP 90155 |
2.06 |
| 2026-04-05 12:00 |
18:24:00.50 |
-63:25:33.6 |
HIP 90155 |
2.57 |
| 2026-04-06 00:00 |
18:23:59.54 |
-63:26:08.9 |
HIP 90155 |
3.10 |
| 2026-04-06 12:00 |
18:23:58.50 |
-63:26:44.2 |
HIP 90155 |
3.65 |
| 2026-04-07 00:00 |
18:23:57.40 |
-63:27:19.4 |
HIP 90155 |
4.22 |
| 2026-04-07 12:00 |
18:23:56.23 |
-63:27:54.6 |
HIP 90155 |
4.79 |
| 2026-04-08 00:00 |
18:23:54.99 |
-63:28:29.7 |
HIP 90155 |
5.37 |
| 2026-04-08 12:00 |
18:23:53.69 |
-63:29:04.9 |
HIP 90155 |
5.95 |
| 2026-04-09 00:00 |
18:23:52.32 |
-63:29:39.9 |
HIP 90155 |
6.53 |
| 2026-04-09 12:00 |
18:23:50.88 |
-63:30:15.0 |
HIP 90155 |
7.12 |
| 2026-04-10 00:00 |
18:23:49.37 |
-63:30:49.9 |
HIP 90155 |
7.71 |
| 2026-04-10 12:00 |
18:23:47.80 |
-63:31:24.9 |
HIP 90155 |
8.30 |
| 2026-04-11 00:00 |
18:23:46.15 |
-63:31:59.8 |
HIP 90155 |
8.90 |
| 2026-04-11 12:00 |
18:23:44.45 |
-63:32:34.6 |
HIP 90155 |
9.49 |
| 2026-04-12 00:00 |
18:23:42.67 |
-63:33:09.3 |
HIP 90155 |
10.09 |
| 2026-04-12 12:00 |
18:23:40.83 |
-63:33:44.1 |
HIP 90155 |
10.69 |
| 2026-04-13 00:00 |
18:23:38.92 |
-63:34:18.7 |
HIP 90155 |
11.29 |
| 2026-04-13 12:00 |
18:23:36.94 |
-63:34:53.3 |
HIP 90155 |
11.89 |
| 2026-04-14 00:00 |
18:23:34.90 |
-63:35:27.8 |
HIP 90155 |
12.49 |
| 2026-04-14 12:00 |
18:23:32.78 |
-63:36:02.2 |
HIP 90155 |
13.10 |
| 2026-04-15 00:00 |
18:23:30.61 |
-63:36:36.6 |
HIP 90155 |
13.71 |
| 2026-04-15 12:00 |
18:23:28.36 |
-63:37:10.9 |
HIP 90155 |
14.32 |
| 2026-04-16 00:00 |
18:23:26.05 |
-63:37:45.1 |
HIP 90155 |
14.93 |