メタデータ
| 項目 |
値 |
| Designation |
P/2005 S2 (Skiff) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2006-06-26T15:13:09.091200Z |
| Orbit solution date (soln_date, UTC) |
2026-07-08T10:42:02Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-12-11.0000000 |
| e |
0.19657154 |
| q (au) |
6.399542 |
| a (au) |
7.965292 |
| i (deg) |
3.140580 |
| Ω (om, deg) |
161.262113 |
| ω (w, deg) |
229.663510 |
| M (ma, deg) |
7.337844 |
等級
散乱 + 全体線形
$$
M_a = (2.982 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.982 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.717 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
22:38:58.98 |
-08:02:05.2 |
HIP 111761 |
12.29 |
| 2026-07-29 12:00 |
22:38:51.21 |
-08:02:57.2 |
HIP 111761 |
11.61 |
| 2026-07-30 00:00 |
22:38:43.34 |
-08:03:49.7 |
HIP 111761 |
11.28 |
| 2026-07-30 12:00 |
22:38:35.39 |
-08:04:42.8 |
HIP 111761 |
11.35 |
| 2026-07-31 00:00 |
22:38:27.34 |
-08:05:36.5 |
HIP 111761 |
11.83 |
| 2026-07-31 12:00 |
22:38:19.20 |
-08:06:30.7 |
HIP 111761 |
12.68 |
| 2026-08-01 00:00 |
22:38:10.98 |
-08:07:25.5 |
HIP 111761 |
13.85 |
| 2026-08-01 12:00 |
22:38:02.66 |
-08:08:20.7 |
HIP 111761 |
15.27 |
| 2026-08-02 00:00 |
22:37:54.26 |
-08:09:16.6 |
HIP 111761 |
16.89 |
| 2026-08-02 12:00 |
22:37:45.77 |
-08:10:12.9 |
HIP 111761 |
18.67 |
| 2026-08-03 00:00 |
22:37:37.20 |
-08:11:09.8 |
HIP 111761 |
20.57 |
| 2026-08-03 12:00 |
22:37:28.55 |
-08:12:07.1 |
HIP 111761 |
22.57 |
| 2026-08-04 00:00 |
22:37:19.81 |
-08:13:05.0 |
HIP 111761 |
24.65 |
| 2026-08-04 12:00 |
22:37:10.99 |
-08:14:03.4 |
HIP 111761 |
26.79 |
| 2026-08-05 00:00 |
22:37:02.09 |
-08:15:02.2 |
HIP 111479 |
28.77 |
| 2026-08-05 12:00 |
22:36:53.11 |
-08:16:01.6 |
HIP 111479 |
26.35 |
| 2026-08-06 00:00 |
22:36:44.06 |
-08:17:01.4 |
HIP 111479 |
23.91 |
| 2026-08-06 12:00 |
22:36:34.93 |
-08:18:01.6 |
HIP 111479 |
21.46 |
| 2026-08-07 00:00 |
22:36:25.72 |
-08:19:02.4 |
HIP 111479 |
19.00 |
| 2026-08-07 12:00 |
22:36:16.44 |
-08:20:03.5 |
HIP 111479 |
16.52 |
| 2026-08-08 00:00 |
22:36:07.09 |
-08:21:05.1 |
HIP 111479 |
14.04 |
| 2026-08-08 12:00 |
22:35:57.66 |
-08:22:07.2 |
HIP 111479 |
11.56 |
| 2026-08-09 00:00 |
22:35:48.17 |
-08:23:09.7 |
HIP 111479 |
9.10 |
| 2026-08-09 12:00 |
22:35:38.60 |
-08:24:12.5 |
HIP 111479 |
6.70 |
| 2026-08-10 00:00 |
22:35:28.97 |
-08:25:15.8 |
HIP 111479 |
4.51 |
| 2026-08-10 12:00 |
22:35:19.28 |
-08:26:19.5 |
HIP 111479 |
3.05 |
| 2026-08-11 00:00 |
22:35:09.52 |
-08:27:23.6 |
HIP 111479 |
3.48 |
| 2026-08-11 12:00 |
22:34:59.69 |
-08:28:28.0 |
HIP 111479 |
5.38 |
| 2026-08-12 00:00 |
22:34:49.81 |
-08:29:32.8 |
HIP 111451 |
7.32 |
| 2026-08-12 12:00 |
22:34:39.87 |
-08:30:38.0 |
HIP 111451 |
5.99 |
| 2026-08-13 00:00 |
22:34:29.87 |
-08:31:43.5 |
HIP 111451 |
5.71 |
| 2026-08-13 12:00 |
22:34:19.81 |
-08:32:49.4 |
HIP 111451 |
6.63 |
| 2026-08-14 00:00 |
22:34:09.70 |
-08:33:55.6 |
HIP 111451 |
8.39 |
| 2026-08-14 12:00 |
22:33:59.53 |
-08:35:02.0 |
HIP 111451 |
10.58 |
| 2026-08-15 00:00 |
22:33:49.32 |
-08:36:08.8 |
HIP 111451 |
13.00 |
| 2026-08-15 12:00 |
22:33:39.05 |
-08:37:15.9 |
HIP 111451 |
15.54 |
| 2026-08-16 00:00 |
22:33:28.74 |
-08:38:23.3 |
HIP 111451 |
18.16 |
| 2026-08-16 12:00 |
22:33:18.38 |
-08:39:30.9 |
HIP 111451 |
20.84 |
| 2026-08-17 00:00 |
22:33:07.98 |
-08:40:38.8 |
HIP 111332 |
23.39 |
| 2026-08-17 12:00 |
22:32:57.53 |
-08:41:47.0 |
HIP 111332 |
22.79 |
| 2026-08-18 00:00 |
22:32:47.04 |
-08:42:55.4 |
HIP 111332 |
22.54 |
| 2026-08-18 12:00 |
22:32:36.51 |
-08:44:04.0 |
HIP 111332 |
22.63 |
| 2026-08-19 00:00 |
22:32:25.95 |
-08:45:12.9 |
HIP 111332 |
23.08 |