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) |
| 2026-09-20 00:00 |
11:17:43.83 |
-05:26:54.3 |
HIP 55210 |
24.74 |
| 2026-09-20 12:00 |
11:18:05.33 |
-05:29:13.1 |
HIP 55213 |
25.03 |
| 2026-09-21 00:00 |
11:18:26.80 |
-05:31:32.0 |
HIP 55213 |
22.24 |
| 2026-09-21 12:00 |
11:18:48.25 |
-05:33:51.1 |
HIP 55213 |
20.75 |
| 2026-09-22 00:00 |
11:19:09.66 |
-05:36:10.3 |
HIP 55285 |
20.31 |
| 2026-09-22 12:00 |
11:19:31.05 |
-05:38:29.6 |
HIP 55285 |
17.92 |
| 2026-09-23 00:00 |
11:19:52.40 |
-05:40:49.1 |
HIP 55285 |
17.24 |
| 2026-09-23 12:00 |
11:20:13.72 |
-05:43:08.7 |
HIP 55285 |
18.45 |
| 2026-09-24 00:00 |
11:20:35.01 |
-05:45:28.5 |
HIP 55482 |
18.04 |
| 2026-09-24 12:00 |
11:20:56.26 |
-05:47:48.3 |
HIP 55482 |
13.44 |
| 2026-09-25 00:00 |
11:21:17.49 |
-05:50:08.3 |
HIP 55482 |
10.15 |
| 2026-09-25 12:00 |
11:21:38.67 |
-05:52:28.3 |
HIP 55482 |
9.59 |
| 2026-09-26 00:00 |
11:21:59.83 |
-05:54:48.5 |
HIP 55482 |
12.13 |
| 2026-09-26 12:00 |
11:22:20.95 |
-05:57:08.8 |
HIP 55482 |
16.39 |
| 2026-09-27 00:00 |
11:22:42.03 |
-05:59:29.2 |
HIP 55482 |
21.36 |
| 2026-09-27 12:00 |
11:23:03.08 |
-06:01:49.7 |
HIP 55666 |
20.87 |
| 2026-09-28 00:00 |
11:23:24.09 |
-06:04:10.3 |
HIP 55666 |
17.26 |
| 2026-09-28 12:00 |
11:23:45.06 |
-06:06:30.9 |
HIP 55666 |
15.03 |
| 2026-09-29 00:00 |
11:24:06.00 |
-06:08:51.7 |
HIP 55666 |
14.81 |
| 2026-09-29 12:00 |
11:24:26.90 |
-06:11:12.5 |
HIP 55666 |
16.67 |
| 2026-09-30 00:00 |
11:24:47.76 |
-06:13:33.5 |
HIP 55666 |
20.04 |
| 2026-09-30 12:00 |
11:25:08.58 |
-06:15:54.5 |
HIP 55739 |
23.82 |
| 2026-10-01 00:00 |
11:25:29.36 |
-06:18:15.5 |
HIP 55739 |
26.37 |
| 2026-10-01 12:00 |
11:25:50.11 |
-06:20:36.7 |
HIP 55739 |
29.78 |
| 2026-10-02 00:00 |
11:26:10.81 |
-06:22:57.8 |
HIP 55739 |
33.81 |
| 2026-10-02 12:00 |
11:26:31.47 |
-06:25:19.1 |
HIP 55996 |
35.58 |
| 2026-10-03 00:00 |
11:26:52.09 |
-06:27:40.4 |
HIP 55996 |
32.88 |
| 2026-10-03 12:00 |
11:27:12.66 |
-06:30:01.8 |
HIP 55996 |
31.00 |
| 2026-10-04 00:00 |
11:27:33.20 |
-06:32:23.2 |
HIP 55996 |
30.06 |
| 2026-10-04 12:00 |
11:27:53.69 |
-06:34:44.6 |
HIP 55996 |
30.17 |
| 2026-10-05 00:00 |
11:28:14.13 |
-06:37:06.1 |
HIP 56108 |
30.01 |
| 2026-10-05 12:00 |
11:28:34.54 |
-06:39:27.6 |
HIP 56108 |
24.42 |
| 2026-10-06 00:00 |
11:28:54.89 |
-06:41:49.2 |
HIP 56108 |
18.84 |
| 2026-10-06 12:00 |
11:29:15.20 |
-06:44:10.8 |
HIP 56108 |
13.28 |
| 2026-10-07 00:00 |
11:29:35.46 |
-06:46:32.3 |
HIP 56108 |
7.72 |
| 2026-10-07 12:00 |
11:29:55.68 |
-06:48:53.9 |
HIP 56108 |
2.19 |
| 2026-10-08 00:00 |
11:30:15.84 |
-06:51:15.5 |
HIP 56108 |
3.37 |
| 2026-10-08 12:00 |
11:30:35.96 |
-06:53:37.1 |
HIP 56108 |
8.89 |
| 2026-10-09 00:00 |
11:30:56.03 |
-06:55:58.8 |
HIP 56166 |
12.90 |
| 2026-10-09 12:00 |
11:31:16.04 |
-06:58:20.3 |
HIP 56166 |
16.42 |
| 2026-10-10 00:00 |
11:31:36.01 |
-07:00:41.9 |
HIP 56166 |
20.81 |
| 2026-10-10 12:00 |
11:31:55.92 |
-07:03:03.5 |
HIP 56166 |
25.62 |
| 2026-10-11 00:00 |
11:32:15.78 |
-07:05:25.0 |
HIP 56166 |
30.64 |