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) |
| 2026-05-12 00:00 |
21:37:36.44 |
+31:11:02.7 |
HIP 106622 |
25.91 |
| 2026-05-12 12:00 |
21:37:36.71 |
+31:11:37.6 |
HIP 106622 |
26.20 |
| 2026-05-13 00:00 |
21:37:36.94 |
+31:12:12.4 |
HIP 106622 |
26.49 |
| 2026-05-13 12:00 |
21:37:37.14 |
+31:12:47.1 |
HIP 106622 |
26.79 |
| 2026-05-14 00:00 |
21:37:37.31 |
+31:13:21.8 |
HIP 106622 |
27.09 |
| 2026-05-14 12:00 |
21:37:37.45 |
+31:13:56.3 |
HIP 106622 |
27.39 |
| 2026-05-15 00:00 |
21:37:37.56 |
+31:14:30.8 |
HIP 106622 |
27.69 |
| 2026-05-15 12:00 |
21:37:37.64 |
+31:15:05.2 |
HIP 106622 |
28.00 |
| 2026-05-16 00:00 |
21:37:37.68 |
+31:15:39.4 |
HIP 106934 |
28.13 |
| 2026-05-16 12:00 |
21:37:37.70 |
+31:16:13.6 |
HIP 106934 |
27.80 |
| 2026-05-17 00:00 |
21:37:37.68 |
+31:16:47.7 |
HIP 106934 |
27.49 |
| 2026-05-17 12:00 |
21:37:37.63 |
+31:17:21.6 |
HIP 106934 |
27.18 |
| 2026-05-18 00:00 |
21:37:37.56 |
+31:17:55.5 |
HIP 106934 |
26.90 |
| 2026-05-18 12:00 |
21:37:37.45 |
+31:18:29.2 |
HIP 106934 |
26.63 |
| 2026-05-19 00:00 |
21:37:37.31 |
+31:19:02.9 |
HIP 106934 |
26.37 |
| 2026-05-19 12:00 |
21:37:37.14 |
+31:19:36.4 |
HIP 106934 |
26.13 |
| 2026-05-20 00:00 |
21:37:36.94 |
+31:20:09.7 |
HIP 106934 |
25.91 |
| 2026-05-20 12:00 |
21:37:36.70 |
+31:20:43.0 |
HIP 106934 |
25.71 |
| 2026-05-21 00:00 |
21:37:36.44 |
+31:21:16.2 |
HIP 106934 |
25.52 |
| 2026-05-21 12:00 |
21:37:36.15 |
+31:21:49.2 |
HIP 106934 |
25.35 |
| 2026-05-22 00:00 |
21:37:35.82 |
+31:22:22.1 |
HIP 106934 |
25.20 |
| 2026-05-22 12:00 |
21:37:35.46 |
+31:22:54.8 |
HIP 106934 |
25.06 |
| 2026-05-23 00:00 |
21:37:35.08 |
+31:23:27.4 |
HIP 106934 |
24.95 |
| 2026-05-23 12:00 |
21:37:34.66 |
+31:24:00.0 |
HIP 106934 |
24.85 |
| 2026-05-24 00:00 |
21:37:34.21 |
+31:24:32.3 |
HIP 106934 |
24.77 |
| 2026-05-24 12:00 |
21:37:33.73 |
+31:25:04.5 |
HIP 106934 |
24.72 |
| 2026-05-25 00:00 |
21:37:33.22 |
+31:25:36.5 |
HIP 106934 |
24.67 |
| 2026-05-25 12:00 |
21:37:32.69 |
+31:26:08.4 |
HIP 106934 |
24.65 |
| 2026-05-26 00:00 |
21:37:32.12 |
+31:26:40.2 |
HIP 106934 |
24.65 |
| 2026-05-26 12:00 |
21:37:31.52 |
+31:27:11.8 |
HIP 106934 |
24.67 |
| 2026-05-27 00:00 |
21:37:30.89 |
+31:27:43.3 |
HIP 106934 |
24.70 |
| 2026-05-27 12:00 |
21:37:30.22 |
+31:28:14.6 |
HIP 106934 |
24.75 |
| 2026-05-28 00:00 |
21:37:29.53 |
+31:28:45.8 |
HIP 106934 |
24.83 |
| 2026-05-28 12:00 |
21:37:28.81 |
+31:29:16.8 |
HIP 106915 |
24.89 |
| 2026-05-29 00:00 |
21:37:28.06 |
+31:29:47.6 |
HIP 106915 |
24.78 |
| 2026-05-29 12:00 |
21:37:27.28 |
+31:30:18.3 |
HIP 106915 |
24.68 |
| 2026-05-30 00:00 |
21:37:26.47 |
+31:30:48.8 |
HIP 106915 |
24.61 |
| 2026-05-30 12:00 |
21:37:25.63 |
+31:31:19.2 |
HIP 106915 |
24.55 |
| 2026-05-31 00:00 |
21:37:24.76 |
+31:31:49.3 |
HIP 106915 |
24.52 |
| 2026-05-31 12:00 |
21:37:23.86 |
+31:32:19.4 |
HIP 106915 |
24.50 |
| 2026-06-01 00:00 |
21:37:22.93 |
+31:32:49.2 |
HIP 106915 |
24.50 |
| 2026-06-01 12:00 |
21:37:21.97 |
+31:33:18.9 |
HIP 106915 |
24.51 |
| 2026-06-02 00:00 |
21:37:20.98 |
+31:33:48.4 |
HIP 106915 |
24.55 |