メタデータ
| 項目 |
値 |
| Designation |
C/2009 O4 (Hill) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-01-01T06:37:51.360960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:32Z |
| Obs used |
764 |
| NEO |
- |
| M1 |
4.900 |
| K1 |
21.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-09-03.0000000 |
| e |
1.00133631 |
| q (au) |
2.563789 |
| a (au) |
-1918.552115 |
| i (deg) |
95.823277 |
| Ω (om, deg) |
172.936518 |
| ω (w, deg) |
223.731941 |
| M (ma, deg) |
-0.001411 |
等級
散乱 + 全体線形
$$
M_a = (14.078 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.078 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.622 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
11:43:18.62 |
+14:44:34.5 |
HIP 57249 |
19.81 |
| 2026-05-12 12:00 |
11:43:16.80 |
+14:44:39.8 |
HIP 57249 |
20.08 |
| 2026-05-13 00:00 |
11:43:15.01 |
+14:44:44.8 |
HIP 57249 |
20.36 |
| 2026-05-13 12:00 |
11:43:13.24 |
+14:44:49.7 |
HIP 57249 |
20.64 |
| 2026-05-14 00:00 |
11:43:11.49 |
+14:44:54.3 |
HIP 57249 |
20.93 |
| 2026-05-14 12:00 |
11:43:09.77 |
+14:44:58.8 |
HIP 57249 |
21.21 |
| 2026-05-15 00:00 |
11:43:08.08 |
+14:45:03.0 |
HIP 57249 |
21.50 |
| 2026-05-15 12:00 |
11:43:06.41 |
+14:45:07.0 |
HIP 57068 |
21.45 |
| 2026-05-16 00:00 |
11:43:04.77 |
+14:45:10.9 |
HIP 57068 |
21.18 |
| 2026-05-16 12:00 |
11:43:03.15 |
+14:45:14.5 |
HIP 57068 |
20.91 |
| 2026-05-17 00:00 |
11:43:01.56 |
+14:45:17.9 |
HIP 57068 |
20.65 |
| 2026-05-17 12:00 |
11:42:59.99 |
+14:45:21.1 |
HIP 57068 |
20.40 |
| 2026-05-18 00:00 |
11:42:58.45 |
+14:45:24.1 |
HIP 57068 |
20.15 |
| 2026-05-18 12:00 |
11:42:56.93 |
+14:45:27.0 |
HIP 57068 |
19.91 |
| 2026-05-19 00:00 |
11:42:55.44 |
+14:45:29.6 |
HIP 57068 |
19.68 |
| 2026-05-19 12:00 |
11:42:53.97 |
+14:45:32.0 |
HIP 57068 |
19.45 |
| 2026-05-20 00:00 |
11:42:52.54 |
+14:45:34.2 |
HIP 57068 |
19.23 |
| 2026-05-20 12:00 |
11:42:51.12 |
+14:45:36.2 |
HIP 57068 |
19.02 |
| 2026-05-21 00:00 |
11:42:49.74 |
+14:45:38.0 |
HIP 57068 |
18.81 |
| 2026-05-21 12:00 |
11:42:48.38 |
+14:45:39.6 |
HIP 57068 |
18.60 |
| 2026-05-22 00:00 |
11:42:47.04 |
+14:45:41.0 |
HIP 57068 |
18.40 |
| 2026-05-22 12:00 |
11:42:45.74 |
+14:45:42.2 |
HIP 57068 |
18.21 |
| 2026-05-23 00:00 |
11:42:44.46 |
+14:45:43.2 |
HIP 57068 |
18.02 |
| 2026-05-23 12:00 |
11:42:43.20 |
+14:45:44.0 |
HIP 57068 |
17.84 |
| 2026-05-24 00:00 |
11:42:41.98 |
+14:45:44.7 |
HIP 57068 |
17.66 |
| 2026-05-24 12:00 |
11:42:40.77 |
+14:45:45.1 |
HIP 57068 |
17.49 |
| 2026-05-25 00:00 |
11:42:39.60 |
+14:45:45.3 |
HIP 57068 |
17.32 |
| 2026-05-25 12:00 |
11:42:38.45 |
+14:45:45.3 |
HIP 57068 |
17.15 |
| 2026-05-26 00:00 |
11:42:37.33 |
+14:45:45.2 |
HIP 57068 |
16.99 |
| 2026-05-26 12:00 |
11:42:36.24 |
+14:45:44.8 |
HIP 57068 |
16.83 |
| 2026-05-27 00:00 |
11:42:35.17 |
+14:45:44.2 |
HIP 57068 |
16.68 |
| 2026-05-27 12:00 |
11:42:34.13 |
+14:45:43.5 |
HIP 57068 |
16.53 |
| 2026-05-28 00:00 |
11:42:33.12 |
+14:45:42.5 |
HIP 57068 |
16.38 |
| 2026-05-28 12:00 |
11:42:32.13 |
+14:45:41.4 |
HIP 57068 |
16.24 |
| 2026-05-29 00:00 |
11:42:31.17 |
+14:45:40.1 |
HIP 57068 |
16.10 |
| 2026-05-29 12:00 |
11:42:30.24 |
+14:45:38.6 |
HIP 57068 |
15.96 |
| 2026-05-30 00:00 |
11:42:29.33 |
+14:45:36.9 |
HIP 57068 |
15.82 |
| 2026-05-30 12:00 |
11:42:28.45 |
+14:45:35.0 |
HIP 57068 |
15.69 |
| 2026-05-31 00:00 |
11:42:27.60 |
+14:45:32.9 |
HIP 57068 |
15.56 |
| 2026-05-31 12:00 |
11:42:26.78 |
+14:45:30.6 |
HIP 57068 |
15.43 |
| 2026-06-01 00:00 |
11:42:25.98 |
+14:45:28.2 |
HIP 57068 |
15.30 |
| 2026-06-01 12:00 |
11:42:25.21 |
+14:45:25.5 |
HIP 57068 |
15.18 |
| 2026-06-02 00:00 |
11:42:24.47 |
+14:45:22.7 |
HIP 57068 |
15.05 |