305P/Skiff
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) |
| 2026-02-03 00:00 |
10:35:31.02 |
-06:53:04.9 |
HIP 51950 |
18.68 |
| 2026-02-03 12:00 |
10:35:11.64 |
-06:51:55.9 |
HIP 51950 |
23.54 |
| 2026-02-04 00:00 |
10:34:52.14 |
-06:50:45.1 |
HIP 51950 |
28.46 |
| 2026-02-04 12:00 |
10:34:32.52 |
-06:49:32.4 |
HIP 51698 |
29.31 |
| 2026-02-05 00:00 |
10:34:12.80 |
-06:48:17.9 |
HIP 51698 |
26.47 |
| 2026-02-05 12:00 |
10:33:52.96 |
-06:47:01.6 |
HIP 51698 |
24.34 |
| 2026-02-06 00:00 |
10:33:33.03 |
-06:45:43.4 |
HIP 51698 |
23.12 |
| 2026-02-06 12:00 |
10:33:12.99 |
-06:44:23.5 |
HIP 51698 |
22.98 |
| 2026-02-07 00:00 |
10:32:52.85 |
-06:43:01.7 |
HIP 51698 |
23.97 |
| 2026-02-07 12:00 |
10:32:32.62 |
-06:41:38.2 |
HIP 51698 |
25.96 |
| 2026-02-08 00:00 |
10:32:12.29 |
-06:40:13.0 |
HIP 51489 |
26.89 |
| 2026-02-08 12:00 |
10:31:51.89 |
-06:38:46.0 |
HIP 51489 |
24.94 |
| 2026-02-09 00:00 |
10:31:31.39 |
-06:37:17.2 |
HIP 51489 |
24.04 |
| 2026-02-09 12:00 |
10:31:10.82 |
-06:35:46.8 |
HIP 51489 |
24.30 |
| 2026-02-10 00:00 |
10:30:50.17 |
-06:34:14.6 |
HIP 51489 |
25.72 |
| 2026-02-10 12:00 |
10:30:29.45 |
-06:32:40.8 |
HIP 51489 |
28.14 |
| 2026-02-11 00:00 |
10:30:08.67 |
-06:31:05.3 |
HIP 51287 |
26.83 |
| 2026-02-11 12:00 |
10:29:47.81 |
-06:29:28.1 |
HIP 51287 |
21.53 |
| 2026-02-12 00:00 |
10:29:26.90 |
-06:27:49.3 |
HIP 51287 |
16.30 |
| 2026-02-12 12:00 |
10:29:05.93 |
-06:26:08.9 |
HIP 51287 |
11.24 |
| 2026-02-13 00:00 |
10:28:44.91 |
-06:24:26.8 |
HIP 51287 |
6.82 |
| 2026-02-13 12:00 |
10:28:23.84 |
-06:22:43.2 |
HIP 51287 |
5.18 |
| 2026-02-14 00:00 |
10:28:02.72 |
-06:20:58.1 |
HIP 51287 |
8.24 |
| 2026-02-14 12:00 |
10:27:41.57 |
-06:19:11.3 |
HIP 51287 |
13.06 |
| 2026-02-15 00:00 |
10:27:20.37 |
-06:17:23.1 |
HIP 51127 |
17.12 |
| 2026-02-15 12:00 |
10:26:59.15 |
-06:15:33.4 |
HIP 51090 |
14.27 |
| 2026-02-16 00:00 |
10:26:37.89 |
-06:13:42.2 |
HIP 51090 |
12.87 |
| 2026-02-16 12:00 |
10:26:16.61 |
-06:11:49.5 |
HIP 51090 |
13.81 |
| 2026-02-17 00:00 |
10:25:55.32 |
-06:09:55.4 |
HIP 51090 |
16.73 |
| 2026-02-17 12:00 |
10:25:34.00 |
-06:07:59.9 |
HIP 51090 |
20.81 |
| 2026-02-18 00:00 |
10:25:12.67 |
-06:06:02.9 |
HIP 51090 |
25.51 |
| 2026-02-18 12:00 |
10:24:51.34 |
-06:04:04.7 |
HIP 51090 |
30.55 |
| 2026-02-19 00:00 |
10:24:30.00 |
-06:02:05.0 |
HIP 50965 |
30.96 |
| 2026-02-19 12:00 |
10:24:08.66 |
-06:00:04.1 |
HIP 50965 |
29.69 |
| 2026-02-20 00:00 |
10:23:47.32 |
-05:58:01.9 |
HIP 50965 |
29.46 |
| 2026-02-20 12:00 |
10:23:26.00 |
-05:55:58.4 |
HIP 50965 |
30.29 |
| 2026-02-21 00:00 |
10:23:04.68 |
-05:53:53.6 |
HIP 50965 |
32.11 |
| 2026-02-21 12:00 |
10:22:43.39 |
-05:51:47.7 |
HIP 50965 |
34.76 |
| 2026-02-22 00:00 |
10:22:22.11 |
-05:49:40.5 |
HIP 50692 |
31.00 |
| 2026-02-22 12:00 |
10:22:00.86 |
-05:47:32.2 |
HIP 50692 |
26.28 |
| 2026-02-23 00:00 |
10:21:39.63 |
-05:45:22.8 |
HIP 50692 |
22.01 |
| 2026-02-23 12:00 |
10:21:18.44 |
-05:43:12.2 |
HIP 50692 |
18.51 |
| 2026-02-24 00:00 |
10:20:57.29 |
-05:41:00.6 |
HIP 50692 |
16.29 |