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) |
| 2026-06-01 00:00 |
10:04:23.11 |
-00:09:40.2 |
HIP 49280 |
12.70 |
| 2026-06-01 12:00 |
10:04:35.61 |
-00:09:37.2 |
HIP 49280 |
15.77 |
| 2026-06-02 00:00 |
10:04:48.23 |
-00:09:35.3 |
HIP 49280 |
18.90 |
| 2026-06-02 12:00 |
10:05:00.98 |
-00:09:34.6 |
HIP 49390 |
18.96 |
| 2026-06-03 00:00 |
10:05:13.87 |
-00:09:35.0 |
HIP 49390 |
19.29 |
| 2026-06-03 12:00 |
10:05:26.87 |
-00:09:36.4 |
HIP 49390 |
20.13 |
| 2026-06-04 00:00 |
10:05:40.01 |
-00:09:39.0 |
HIP 49390 |
21.43 |
| 2026-06-04 12:00 |
10:05:53.26 |
-00:09:42.7 |
HIP 49390 |
23.14 |
| 2026-06-05 00:00 |
10:06:06.64 |
-00:09:47.5 |
HIP 49600 |
21.33 |
| 2026-06-05 12:00 |
10:06:20.14 |
-00:09:53.4 |
HIP 49600 |
18.06 |
| 2026-06-06 00:00 |
10:06:33.77 |
-00:10:00.3 |
HIP 49600 |
14.81 |
| 2026-06-06 12:00 |
10:06:47.51 |
-00:10:08.4 |
HIP 49600 |
11.62 |
| 2026-06-07 00:00 |
10:07:01.37 |
-00:10:17.5 |
HIP 49600 |
8.58 |
| 2026-06-07 12:00 |
10:07:15.35 |
-00:10:27.7 |
HIP 49600 |
6.00 |
| 2026-06-08 00:00 |
10:07:29.45 |
-00:10:39.0 |
HIP 49600 |
4.76 |
| 2026-06-08 12:00 |
10:07:43.67 |
-00:10:51.4 |
HIP 49600 |
5.86 |
| 2026-06-09 00:00 |
10:07:58.00 |
-00:11:04.8 |
HIP 49600 |
8.46 |
| 2026-06-09 12:00 |
10:08:12.44 |
-00:11:19.3 |
HIP 49600 |
11.62 |
| 2026-06-10 00:00 |
10:08:27.00 |
-00:11:34.9 |
HIP 49641 |
13.18 |
| 2026-06-10 12:00 |
10:08:41.67 |
-00:11:51.5 |
HIP 49641 |
15.42 |
| 2026-06-11 00:00 |
10:08:56.46 |
-00:12:09.2 |
HIP 49641 |
18.14 |
| 2026-06-11 12:00 |
10:09:11.35 |
-00:12:28.0 |
HIP 49641 |
21.18 |
| 2026-06-12 00:00 |
10:09:26.35 |
-00:12:47.7 |
HIP 49641 |
24.44 |
| 2026-06-12 12:00 |
10:09:41.47 |
-00:13:08.6 |
HIP 49641 |
27.84 |
| 2026-06-13 00:00 |
10:09:56.69 |
-00:13:30.4 |
HIP 49641 |
31.36 |
| 2026-06-13 12:00 |
10:10:12.02 |
-00:13:53.4 |
HIP 49641 |
34.96 |
| 2026-06-14 00:00 |
10:10:27.45 |
-00:14:17.3 |
HIP 49641 |
38.63 |
| 2026-06-14 12:00 |
10:10:42.99 |
-00:14:42.3 |
HIP 50005 |
35.55 |
| 2026-06-15 00:00 |
10:10:58.64 |
-00:15:08.3 |
HIP 50005 |
32.41 |
| 2026-06-15 12:00 |
10:11:14.38 |
-00:15:35.3 |
HIP 50005 |
29.42 |
| 2026-06-16 00:00 |
10:11:30.23 |
-00:16:03.4 |
HIP 50005 |
26.67 |
| 2026-06-16 12:00 |
10:11:46.18 |
-00:16:32.4 |
HIP 50005 |
24.23 |
| 2026-06-17 00:00 |
10:12:02.23 |
-00:17:02.5 |
HIP 50005 |
22.24 |
| 2026-06-17 12:00 |
10:12:18.38 |
-00:17:33.6 |
HIP 50005 |
20.82 |
| 2026-06-18 00:00 |
10:12:34.63 |
-00:18:05.6 |
HIP 50005 |
20.13 |
| 2026-06-18 12:00 |
10:12:50.97 |
-00:18:38.7 |
HIP 50005 |
20.25 |
| 2026-06-19 00:00 |
10:13:07.41 |
-00:19:12.7 |
HIP 50005 |
21.18 |
| 2026-06-19 12:00 |
10:13:23.95 |
-00:19:47.8 |
HIP 50195 |
21.53 |
| 2026-06-20 00:00 |
10:13:40.57 |
-00:20:23.8 |
HIP 50195 |
17.51 |
| 2026-06-20 12:00 |
10:13:57.29 |
-00:21:00.7 |
HIP 50195 |
13.58 |
| 2026-06-21 00:00 |
10:14:14.10 |
-00:21:38.7 |
HIP 50195 |
9.88 |
| 2026-06-21 12:00 |
10:14:31.00 |
-00:22:17.6 |
HIP 50195 |
6.85 |
| 2026-06-22 00:00 |
10:14:47.99 |
-00:22:57.4 |
HIP 50195 |
5.74 |