メタデータ
| 項目 |
値 |
| Designation |
305P/Skiff |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-11-14T20:47:51.241920Z |
| Orbit solution date (soln_date, UTC) |
2025-03-12T14:12:24Z |
| Obs used |
1263 |
| NEO |
- |
| M1 |
17.000 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-06-23.0000000 |
| e |
0.69233211 |
| q (au) |
1.429531 |
| a (au) |
4.646345 |
| i (deg) |
11.636720 |
| Ω (om, deg) |
240.147035 |
| ω (w, deg) |
147.273501 |
| M (ma, deg) |
165.439476 |
等級
散乱 + 全体線形
$$
M_a = (15.192 + 5.556\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.192 |
| n |
5.556 |
| gf |
1.000 |
| gb |
-0.995 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2024-08-05 |
2025-02-16 |
-9.7820 |
+1.600 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
10:38:54.64 |
-01:50:47.2 |
HIP 52080 |
13.48 |
| 2026-07-29 12:00 |
10:39:16.02 |
-01:52:25.5 |
HIP 52080 |
15.26 |
| 2026-07-30 00:00 |
10:39:37.44 |
-01:54:04.3 |
HIP 52080 |
18.62 |
| 2026-07-30 12:00 |
10:39:58.89 |
-01:55:43.8 |
HIP 52080 |
22.88 |
| 2026-07-31 00:00 |
10:40:20.36 |
-01:57:23.8 |
HIP 52316 |
20.54 |
| 2026-07-31 12:00 |
10:40:41.87 |
-01:59:04.5 |
HIP 52316 |
18.04 |
| 2026-08-01 00:00 |
10:41:03.40 |
-02:00:45.7 |
HIP 52316 |
17.10 |
| 2026-08-01 12:00 |
10:41:24.96 |
-02:02:27.5 |
HIP 52316 |
17.99 |
| 2026-08-02 00:00 |
10:41:46.55 |
-02:04:09.9 |
HIP 52409 |
16.92 |
| 2026-08-02 12:00 |
10:42:08.17 |
-02:05:52.8 |
HIP 52409 |
11.31 |
| 2026-08-03 00:00 |
10:42:29.82 |
-02:07:36.3 |
HIP 52409 |
5.77 |
| 2026-08-03 12:00 |
10:42:51.49 |
-02:09:20.4 |
HIP 52409 |
1.81 |
| 2026-08-04 00:00 |
10:43:13.18 |
-02:11:05.1 |
HIP 52409 |
6.16 |
| 2026-08-04 12:00 |
10:43:34.90 |
-02:12:50.3 |
HIP 52409 |
11.73 |
| 2026-08-05 00:00 |
10:43:56.65 |
-02:14:36.1 |
HIP 52543 |
16.75 |
| 2026-08-05 12:00 |
10:44:18.42 |
-02:16:22.5 |
HIP 52543 |
12.72 |
| 2026-08-06 00:00 |
10:44:40.22 |
-02:18:09.3 |
HIP 52543 |
10.41 |
| 2026-08-06 12:00 |
10:45:02.03 |
-02:19:56.8 |
HIP 52543 |
10.97 |
| 2026-08-07 00:00 |
10:45:23.87 |
-02:21:44.8 |
HIP 52669 |
12.89 |
| 2026-08-07 12:00 |
10:45:45.73 |
-02:23:33.3 |
HIP 52669 |
7.16 |
| 2026-08-08 00:00 |
10:46:07.61 |
-02:25:22.3 |
HIP 52669 |
1.60 |
| 2026-08-08 12:00 |
10:46:29.52 |
-02:27:11.9 |
HIP 52669 |
4.50 |
| 2026-08-09 00:00 |
10:46:51.44 |
-02:29:02.0 |
HIP 52669 |
10.23 |
| 2026-08-09 12:00 |
10:47:13.38 |
-02:30:52.7 |
HIP 52669 |
16.00 |
| 2026-08-10 00:00 |
10:47:35.35 |
-02:32:43.8 |
HIP 52669 |
21.78 |
| 2026-08-10 12:00 |
10:47:57.33 |
-02:34:35.5 |
HIP 52669 |
27.57 |
| 2026-08-11 00:00 |
10:48:19.32 |
-02:36:27.7 |
HIP 52669 |
33.37 |
| 2026-08-11 12:00 |
10:48:41.34 |
-02:38:20.3 |
HIP 52857 |
37.05 |
| 2026-08-12 00:00 |
10:49:03.37 |
-02:40:13.5 |
HIP 52857 |
35.95 |
| 2026-08-12 12:00 |
10:49:25.42 |
-02:42:07.2 |
HIP 53035 |
34.25 |
| 2026-08-13 00:00 |
10:49:47.48 |
-02:44:01.4 |
HIP 53035 |
29.03 |
| 2026-08-13 12:00 |
10:50:09.55 |
-02:45:56.0 |
HIP 53035 |
24.08 |
| 2026-08-14 00:00 |
10:50:31.64 |
-02:47:51.2 |
HIP 53035 |
19.61 |
| 2026-08-14 12:00 |
10:50:53.74 |
-02:49:46.8 |
HIP 53035 |
16.05 |
| 2026-08-15 00:00 |
10:51:15.86 |
-02:51:42.9 |
HIP 53035 |
14.09 |
| 2026-08-15 12:00 |
10:51:37.98 |
-02:53:39.4 |
HIP 53035 |
14.41 |
| 2026-08-16 00:00 |
10:52:00.12 |
-02:55:36.5 |
HIP 53207 |
16.02 |
| 2026-08-16 12:00 |
10:52:22.27 |
-02:57:33.9 |
HIP 53207 |
10.25 |
| 2026-08-17 00:00 |
10:52:44.42 |
-02:59:31.8 |
HIP 53207 |
4.71 |
| 2026-08-17 12:00 |
10:53:06.59 |
-03:01:30.2 |
HIP 53207 |
2.88 |
| 2026-08-18 00:00 |
10:53:28.76 |
-03:03:29.0 |
HIP 53207 |
7.97 |
| 2026-08-18 12:00 |
10:53:50.95 |
-03:05:28.2 |
HIP 53207 |
13.70 |
| 2026-08-19 00:00 |
10:54:13.13 |
-03:07:27.9 |
HIP 53369 |
18.91 |