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 |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
09:58:02.35 |
-00:27:42.3 |
HIP 48756 |
20.81 |
| 2026-05-12 12:00 |
09:58:08.73 |
-00:26:51.5 |
HIP 48756 |
22.42 |
| 2026-05-13 00:00 |
09:58:15.29 |
-00:26:02.0 |
HIP 48756 |
24.10 |
| 2026-05-13 12:00 |
09:58:22.01 |
-00:25:13.7 |
HIP 48756 |
25.84 |
| 2026-05-14 00:00 |
09:58:28.92 |
-00:24:26.7 |
HIP 48756 |
27.64 |
| 2026-05-14 12:00 |
09:58:35.99 |
-00:23:40.8 |
HIP 48756 |
29.49 |
| 2026-05-15 00:00 |
09:58:43.23 |
-00:22:56.3 |
HIP 48756 |
31.39 |
| 2026-05-15 12:00 |
09:58:50.65 |
-00:22:12.9 |
HIP 48756 |
33.33 |
| 2026-05-16 00:00 |
09:58:58.23 |
-00:21:30.8 |
HIP 48756 |
35.32 |
| 2026-05-16 12:00 |
09:59:05.99 |
-00:20:49.9 |
HIP 48756 |
37.35 |
| 2026-05-17 00:00 |
09:59:13.90 |
-00:20:10.3 |
HIP 48756 |
39.42 |
| 2026-05-17 12:00 |
09:59:21.99 |
-00:19:31.9 |
HIP 48756 |
41.53 |
| 2026-05-18 00:00 |
09:59:30.24 |
-00:18:54.7 |
HIP 48927 |
41.38 |
| 2026-05-18 12:00 |
09:59:38.65 |
-00:18:18.7 |
HIP 48927 |
41.33 |
| 2026-05-19 00:00 |
09:59:47.23 |
-00:17:44.0 |
HIP 48927 |
41.42 |
| 2026-05-19 12:00 |
09:59:55.96 |
-00:17:10.5 |
HIP 48927 |
41.67 |
| 2026-05-20 00:00 |
10:00:04.86 |
-00:16:38.2 |
HIP 48927 |
42.07 |
| 2026-05-20 12:00 |
10:00:13.91 |
-00:16:07.1 |
HIP 48927 |
42.63 |
| 2026-05-21 00:00 |
10:00:23.13 |
-00:15:37.3 |
HIP 48927 |
43.34 |
| 2026-05-21 12:00 |
10:00:32.49 |
-00:15:08.6 |
HIP 48927 |
44.21 |
| 2026-05-22 00:00 |
10:00:42.02 |
-00:14:41.2 |
HIP 49280 |
42.91 |
| 2026-05-22 12:00 |
10:00:51.69 |
-00:14:15.0 |
HIP 49280 |
40.47 |
| 2026-05-23 00:00 |
10:01:01.52 |
-00:13:49.9 |
HIP 49280 |
38.00 |
| 2026-05-23 12:00 |
10:01:11.50 |
-00:13:26.1 |
HIP 49280 |
35.49 |
| 2026-05-24 00:00 |
10:01:21.63 |
-00:13:03.5 |
HIP 49280 |
32.95 |
| 2026-05-24 12:00 |
10:01:31.91 |
-00:12:42.0 |
HIP 49280 |
30.37 |
| 2026-05-25 00:00 |
10:01:42.34 |
-00:12:21.8 |
HIP 49280 |
27.76 |
| 2026-05-25 12:00 |
10:01:52.91 |
-00:12:02.7 |
HIP 49280 |
25.12 |
| 2026-05-26 00:00 |
10:02:03.63 |
-00:11:44.8 |
HIP 49280 |
22.45 |
| 2026-05-26 12:00 |
10:02:14.49 |
-00:11:28.0 |
HIP 49280 |
19.74 |
| 2026-05-27 00:00 |
10:02:25.49 |
-00:11:12.5 |
HIP 49280 |
17.01 |
| 2026-05-27 12:00 |
10:02:36.63 |
-00:10:58.1 |
HIP 49280 |
14.25 |
| 2026-05-28 00:00 |
10:02:47.92 |
-00:10:44.8 |
HIP 49280 |
11.47 |
| 2026-05-28 12:00 |
10:02:59.34 |
-00:10:32.7 |
HIP 49280 |
8.68 |
| 2026-05-29 00:00 |
10:03:10.90 |
-00:10:21.8 |
HIP 49280 |
5.93 |
| 2026-05-29 12:00 |
10:03:22.60 |
-00:10:12.0 |
HIP 49280 |
3.39 |
| 2026-05-30 00:00 |
10:03:34.44 |
-00:10:03.4 |
HIP 49280 |
2.21 |
| 2026-05-30 12:00 |
10:03:46.41 |
-00:09:55.9 |
HIP 49280 |
4.00 |
| 2026-05-31 00:00 |
10:03:58.51 |
-00:09:49.5 |
HIP 49280 |
6.73 |
| 2026-05-31 12:00 |
10:04:10.74 |
-00:09:44.3 |
HIP 49280 |
9.67 |
| 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 |