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
$$
M_a = (18.239 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.239 |
| n |
2.000 |
| gf |
0.929 |
| gb |
-0.626 |
| k |
0.989 |
| δ90 |
7.543 |
| 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) |
| 2026-07-29 00:00 |
21:32:46.09 |
+32:02:45.0 |
HIP 106215 |
25.47 |
| 2026-07-29 12:00 |
21:32:42.68 |
+32:02:43.0 |
HIP 106215 |
24.76 |
| 2026-07-30 00:00 |
21:32:39.26 |
+32:02:40.8 |
HIP 106215 |
24.04 |
| 2026-07-30 12:00 |
21:32:35.83 |
+32:02:38.2 |
HIP 106215 |
23.32 |
| 2026-07-31 00:00 |
21:32:32.39 |
+32:02:35.2 |
HIP 106215 |
22.60 |
| 2026-07-31 12:00 |
21:32:28.94 |
+32:02:32.0 |
HIP 106215 |
21.88 |
| 2026-08-01 00:00 |
21:32:25.49 |
+32:02:28.4 |
HIP 106215 |
21.15 |
| 2026-08-01 12:00 |
21:32:22.03 |
+32:02:24.6 |
HIP 106215 |
20.43 |
| 2026-08-02 00:00 |
21:32:18.56 |
+32:02:20.3 |
HIP 106215 |
19.70 |
| 2026-08-02 12:00 |
21:32:15.09 |
+32:02:15.8 |
HIP 106215 |
18.96 |
| 2026-08-03 00:00 |
21:32:11.61 |
+32:02:10.9 |
HIP 106215 |
18.23 |
| 2026-08-03 12:00 |
21:32:08.12 |
+32:02:05.8 |
HIP 106215 |
17.50 |
| 2026-08-04 00:00 |
21:32:04.63 |
+32:02:00.2 |
HIP 106215 |
16.76 |
| 2026-08-04 12:00 |
21:32:01.14 |
+32:01:54.4 |
HIP 106215 |
16.02 |
| 2026-08-05 00:00 |
21:31:57.63 |
+32:01:48.3 |
HIP 106215 |
15.28 |
| 2026-08-05 12:00 |
21:31:54.13 |
+32:01:41.8 |
HIP 106215 |
14.53 |
| 2026-08-06 00:00 |
21:31:50.62 |
+32:01:35.0 |
HIP 106215 |
13.79 |
| 2026-08-06 12:00 |
21:31:47.10 |
+32:01:27.8 |
HIP 106215 |
13.04 |
| 2026-08-07 00:00 |
21:31:43.58 |
+32:01:20.4 |
HIP 106215 |
12.30 |
| 2026-08-07 12:00 |
21:31:40.06 |
+32:01:12.6 |
HIP 106215 |
11.55 |
| 2026-08-08 00:00 |
21:31:36.53 |
+32:01:04.5 |
HIP 106215 |
10.80 |
| 2026-08-08 12:00 |
21:31:33.00 |
+32:00:56.1 |
HIP 106215 |
10.04 |
| 2026-08-09 00:00 |
21:31:29.47 |
+32:00:47.3 |
HIP 106215 |
9.29 |
| 2026-08-09 12:00 |
21:31:25.94 |
+32:00:38.3 |
HIP 106215 |
8.54 |
| 2026-08-10 00:00 |
21:31:22.40 |
+32:00:28.9 |
HIP 106215 |
7.79 |
| 2026-08-10 12:00 |
21:31:18.86 |
+32:00:19.2 |
HIP 106215 |
7.03 |
| 2026-08-11 00:00 |
21:31:15.32 |
+32:00:09.1 |
HIP 106215 |
6.28 |
| 2026-08-11 12:00 |
21:31:11.78 |
+31:59:58.8 |
HIP 106215 |
5.53 |
| 2026-08-12 00:00 |
21:31:08.24 |
+31:59:48.1 |
HIP 106215 |
4.78 |
| 2026-08-12 12:00 |
21:31:04.69 |
+31:59:37.1 |
HIP 106215 |
4.04 |
| 2026-08-13 00:00 |
21:31:01.15 |
+31:59:25.8 |
HIP 106215 |
3.32 |
| 2026-08-13 12:00 |
21:30:57.60 |
+31:59:14.2 |
HIP 106215 |
2.61 |
| 2026-08-14 00:00 |
21:30:54.06 |
+31:59:02.2 |
HIP 106215 |
1.96 |
| 2026-08-14 12:00 |
21:30:50.52 |
+31:58:50.0 |
HIP 106215 |
1.43 |
| 2026-08-15 00:00 |
21:30:46.97 |
+31:58:37.4 |
HIP 106215 |
1.20 |
| 2026-08-15 12:00 |
21:30:43.43 |
+31:58:24.5 |
HIP 106215 |
1.44 |
| 2026-08-16 00:00 |
21:30:39.89 |
+31:58:11.3 |
HIP 106215 |
1.97 |
| 2026-08-16 12:00 |
21:30:36.36 |
+31:57:57.8 |
HIP 106215 |
2.63 |
| 2026-08-17 00:00 |
21:30:32.82 |
+31:57:44.0 |
HIP 106215 |
3.35 |
| 2026-08-17 12:00 |
21:30:29.29 |
+31:57:29.8 |
HIP 106215 |
4.09 |
| 2026-08-18 00:00 |
21:30:25.76 |
+31:57:15.4 |
HIP 106215 |
4.84 |
| 2026-08-18 12:00 |
21:30:22.23 |
+31:57:00.6 |
HIP 106215 |
5.60 |
| 2026-08-19 00:00 |
21:30:18.70 |
+31:56:45.6 |
HIP 106215 |
6.37 |