メタデータ
| 項目 |
値 |
| Designation |
C/2007 H2 (Skiff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-02-17T01:18:40.541760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:06Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
18.300 |
| K1 |
6.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-04-24.0000000 |
| e |
0.97167863 |
| q (au) |
1.410452 |
| a (au) |
49.801695 |
| i (deg) |
52.190808 |
| Ω (om, deg) |
203.771836 |
| ω (w, deg) |
319.302431 |
| M (ma, deg) |
0.184936 |
等級
散乱 + 全体線形
$$
M_a = (18.200 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.200 |
| n |
2.000 |
| gf |
0.996 |
| gb |
-0.626 |
| k |
0.990 |
| 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) |
| 2026-03-26 00:00 |
21:35:03.37 |
+30:16:06.7 |
HIP 106661 |
19.92 |
| 2026-03-26 12:00 |
21:35:06.18 |
+30:16:38.3 |
HIP 106661 |
19.81 |
| 2026-03-27 00:00 |
21:35:08.97 |
+30:17:10.1 |
HIP 106661 |
19.74 |
| 2026-03-27 12:00 |
21:35:11.74 |
+30:17:42.1 |
HIP 106661 |
19.70 |
| 2026-03-28 00:00 |
21:35:14.48 |
+30:18:14.2 |
HIP 106661 |
19.70 |
| 2026-03-28 12:00 |
21:35:17.21 |
+30:18:46.4 |
HIP 106661 |
19.74 |
| 2026-03-29 00:00 |
21:35:19.91 |
+30:19:18.7 |
HIP 106661 |
19.81 |
| 2026-03-29 12:00 |
21:35:22.59 |
+30:19:51.2 |
HIP 106661 |
19.92 |
| 2026-03-30 00:00 |
21:35:25.25 |
+30:20:23.9 |
HIP 106661 |
20.07 |
| 2026-03-30 12:00 |
21:35:27.89 |
+30:20:56.6 |
HIP 106661 |
20.25 |
| 2026-03-31 00:00 |
21:35:30.51 |
+30:21:29.5 |
HIP 106661 |
20.46 |
| 2026-03-31 12:00 |
21:35:33.10 |
+30:22:02.5 |
HIP 106661 |
20.71 |
| 2026-04-01 00:00 |
21:35:35.67 |
+30:22:35.6 |
HIP 106661 |
20.98 |
| 2026-04-01 12:00 |
21:35:38.21 |
+30:23:08.9 |
HIP 106661 |
21.29 |
| 2026-04-02 00:00 |
21:35:40.74 |
+30:23:42.2 |
HIP 106661 |
21.62 |
| 2026-04-02 12:00 |
21:35:43.24 |
+30:24:15.7 |
HIP 106661 |
21.98 |
| 2026-04-03 00:00 |
21:35:45.72 |
+30:24:49.3 |
HIP 106661 |
22.36 |
| 2026-04-03 12:00 |
21:35:48.17 |
+30:25:23.0 |
HIP 106661 |
22.76 |
| 2026-04-04 00:00 |
21:35:50.60 |
+30:25:56.8 |
HIP 106661 |
23.19 |
| 2026-04-04 12:00 |
21:35:53.01 |
+30:26:30.7 |
HIP 106661 |
23.64 |
| 2026-04-05 00:00 |
21:35:55.39 |
+30:27:04.8 |
HIP 106661 |
24.10 |
| 2026-04-05 12:00 |
21:35:57.75 |
+30:27:38.9 |
HIP 106661 |
24.58 |
| 2026-04-06 00:00 |
21:36:00.09 |
+30:28:13.1 |
HIP 106661 |
25.08 |
| 2026-04-06 12:00 |
21:36:02.40 |
+30:28:47.5 |
HIP 106661 |
25.60 |
| 2026-04-07 00:00 |
21:36:04.68 |
+30:29:21.9 |
HIP 106661 |
26.13 |
| 2026-04-07 12:00 |
21:36:06.94 |
+30:29:56.4 |
HIP 106661 |
26.67 |
| 2026-04-08 00:00 |
21:36:09.18 |
+30:30:31.0 |
HIP 106661 |
27.22 |
| 2026-04-08 12:00 |
21:36:11.39 |
+30:31:05.7 |
HIP 106661 |
27.78 |
| 2026-04-09 00:00 |
21:36:13.58 |
+30:31:40.5 |
HIP 106661 |
28.36 |
| 2026-04-09 12:00 |
21:36:15.74 |
+30:32:15.4 |
HIP 106661 |
28.94 |
| 2026-04-10 00:00 |
21:36:17.88 |
+30:32:50.3 |
HIP 106622 |
28.59 |
| 2026-04-10 12:00 |
21:36:19.99 |
+30:33:25.4 |
HIP 106622 |
28.14 |
| 2026-04-11 00:00 |
21:36:22.07 |
+30:34:00.5 |
HIP 106622 |
27.70 |
| 2026-04-11 12:00 |
21:36:24.13 |
+30:34:35.6 |
HIP 106622 |
27.26 |
| 2026-04-12 00:00 |
21:36:26.17 |
+30:35:10.9 |
HIP 106622 |
26.84 |
| 2026-04-12 12:00 |
21:36:28.17 |
+30:35:46.2 |
HIP 106622 |
26.43 |
| 2026-04-13 00:00 |
21:36:30.15 |
+30:36:21.6 |
HIP 106622 |
26.03 |
| 2026-04-13 12:00 |
21:36:32.11 |
+30:36:57.1 |
HIP 106622 |
25.64 |
| 2026-04-14 00:00 |
21:36:34.04 |
+30:37:32.6 |
HIP 106622 |
25.26 |
| 2026-04-14 12:00 |
21:36:35.94 |
+30:38:08.2 |
HIP 106622 |
24.90 |
| 2026-04-15 00:00 |
21:36:37.81 |
+30:38:43.9 |
HIP 106622 |
24.54 |
| 2026-04-15 12:00 |
21:36:39.66 |
+30:39:19.5 |
HIP 106622 |
24.20 |
| 2026-04-16 00:00 |
21:36:41.48 |
+30:39:55.3 |
HIP 106622 |
23.87 |