メタデータ
| 項目 |
値 |
| Designation |
P/2005 S2 (Skiff) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2006-06-30T17:48:40.472640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:52Z |
| Obs used |
90 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-09-03.0000000 |
| e |
0.19670978 |
| q (au) |
6.398037 |
| a (au) |
7.964789 |
| i (deg) |
3.141049 |
| Ω (om, deg) |
161.272405 |
| ω (w, deg) |
229.933181 |
| M (ma, deg) |
346.813274 |
等級
散乱 + 全体線形
$$
M_a = (2.987 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.987 |
| n |
6.000 |
| gf |
0.966 |
| gb |
-0.504 |
| k |
1.000 |
| δ90 |
9.678 |
| 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 |
22:35:06.20 |
-08:14:57.2 |
HIP 111479 |
9.09 |
| 2026-05-12 12:00 |
22:35:16.82 |
-08:13:57.2 |
HIP 111479 |
10.08 |
| 2026-05-13 00:00 |
22:35:27.34 |
-08:12:57.9 |
HIP 111479 |
11.66 |
| 2026-05-13 12:00 |
22:35:37.76 |
-08:11:59.1 |
HIP 111479 |
13.61 |
| 2026-05-14 00:00 |
22:35:48.08 |
-08:11:00.9 |
HIP 111479 |
15.78 |
| 2026-05-14 12:00 |
22:35:58.29 |
-08:10:03.3 |
HIP 111479 |
18.08 |
| 2026-05-15 00:00 |
22:36:08.40 |
-08:09:06.3 |
HIP 111479 |
20.45 |
| 2026-05-15 12:00 |
22:36:18.40 |
-08:08:09.9 |
HIP 111479 |
22.87 |
| 2026-05-16 00:00 |
22:36:28.31 |
-08:07:14.1 |
HIP 111479 |
25.30 |
| 2026-05-16 12:00 |
22:36:38.10 |
-08:06:18.9 |
HIP 111577 |
26.96 |
| 2026-05-17 00:00 |
22:36:47.79 |
-08:05:24.3 |
HIP 111761 |
26.05 |
| 2026-05-17 12:00 |
22:36:57.37 |
-08:04:30.4 |
HIP 111761 |
23.53 |
| 2026-05-18 00:00 |
22:37:06.85 |
-08:03:37.0 |
HIP 111761 |
21.03 |
| 2026-05-18 12:00 |
22:37:16.22 |
-08:02:44.3 |
HIP 111761 |
18.57 |
| 2026-05-19 00:00 |
22:37:25.48 |
-08:01:52.2 |
HIP 111761 |
16.15 |
| 2026-05-19 12:00 |
22:37:34.64 |
-08:01:00.8 |
HIP 111761 |
13.76 |
| 2026-05-20 00:00 |
22:37:43.68 |
-08:00:10.0 |
HIP 111761 |
11.42 |
| 2026-05-20 12:00 |
22:37:52.62 |
-07:59:19.8 |
HIP 111761 |
9.13 |
| 2026-05-21 00:00 |
22:38:01.44 |
-07:58:30.3 |
HIP 111761 |
6.91 |
| 2026-05-21 12:00 |
22:38:10.16 |
-07:57:41.4 |
HIP 111761 |
4.84 |
| 2026-05-22 00:00 |
22:38:18.77 |
-07:56:53.1 |
HIP 111761 |
3.14 |
| 2026-05-22 12:00 |
22:38:27.26 |
-07:56:05.5 |
HIP 111761 |
2.58 |
| 2026-05-23 00:00 |
22:38:35.65 |
-07:55:18.6 |
HIP 111761 |
3.66 |
| 2026-05-23 12:00 |
22:38:43.92 |
-07:54:32.3 |
HIP 111761 |
5.45 |
| 2026-05-24 00:00 |
22:38:52.08 |
-07:53:46.7 |
HIP 111761 |
7.42 |
| 2026-05-24 12:00 |
22:39:00.13 |
-07:53:01.7 |
HIP 111761 |
9.45 |
| 2026-05-25 00:00 |
22:39:08.07 |
-07:52:17.4 |
HIP 111761 |
11.49 |
| 2026-05-25 12:00 |
22:39:15.89 |
-07:51:33.8 |
HIP 111761 |
13.52 |
| 2026-05-26 00:00 |
22:39:23.61 |
-07:50:50.9 |
HIP 111863 |
14.67 |
| 2026-05-26 12:00 |
22:39:31.20 |
-07:50:08.6 |
HIP 111863 |
13.87 |
| 2026-05-27 00:00 |
22:39:38.69 |
-07:49:27.0 |
HIP 111863 |
13.34 |
| 2026-05-27 12:00 |
22:39:46.06 |
-07:48:46.0 |
HIP 111863 |
13.09 |
| 2026-05-28 00:00 |
22:39:53.31 |
-07:48:05.8 |
HIP 111863 |
13.12 |
| 2026-05-28 12:00 |
22:40:00.45 |
-07:47:26.2 |
HIP 111863 |
13.42 |
| 2026-05-29 00:00 |
22:40:07.48 |
-07:46:47.3 |
HIP 111863 |
13.97 |
| 2026-05-29 12:00 |
22:40:14.39 |
-07:46:09.2 |
HIP 111863 |
14.72 |
| 2026-05-30 00:00 |
22:40:21.18 |
-07:45:31.7 |
HIP 111863 |
15.63 |
| 2026-05-30 12:00 |
22:40:27.86 |
-07:44:54.9 |
HIP 111863 |
16.66 |
| 2026-05-31 00:00 |
22:40:34.42 |
-07:44:18.8 |
HIP 111863 |
17.79 |
| 2026-05-31 12:00 |
22:40:40.86 |
-07:43:43.4 |
HIP 111863 |
18.99 |
| 2026-06-01 00:00 |
22:40:47.19 |
-07:43:08.7 |
HIP 111863 |
20.24 |
| 2026-06-01 12:00 |
22:40:53.39 |
-07:42:34.7 |
HIP 111863 |
21.52 |
| 2026-06-02 00:00 |
22:40:59.48 |
-07:42:01.4 |
HIP 111863 |
22.82 |