メタデータ
| 項目 |
値 |
| Designation |
C/2001 S1 (Skiff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-06-02T08:44:15.699840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:11Z |
| Obs used |
39 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
15.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2001-10-05.0000000 |
| e |
0.92987325 |
| q (au) |
3.749250 |
| a (au) |
53.463910 |
| i (deg) |
139.132817 |
| Ω (om, deg) |
330.121196 |
| ω (w, deg) |
285.171215 |
| M (ma, deg) |
0.314236 |
等級
散乱 + 全体線形
$$
M_a = (7.013 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.013 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
17:22:21.76 |
+17:23:43.8 |
HIP 85161 |
26.58 |
| 2026-05-12 12:00 |
17:22:18.88 |
+17:24:01.4 |
HIP 85161 |
27.23 |
| 2026-05-13 00:00 |
17:22:15.97 |
+17:24:18.8 |
HIP 85161 |
27.89 |
| 2026-05-13 12:00 |
17:22:13.06 |
+17:24:36.0 |
HIP 85161 |
28.56 |
| 2026-05-14 00:00 |
17:22:10.13 |
+17:24:53.0 |
HIP 85161 |
29.23 |
| 2026-05-14 12:00 |
17:22:07.19 |
+17:25:09.8 |
HIP 85161 |
29.91 |
| 2026-05-15 00:00 |
17:22:04.24 |
+17:25:26.4 |
HIP 84875 |
29.69 |
| 2026-05-15 12:00 |
17:22:01.27 |
+17:25:42.8 |
HIP 84875 |
29.46 |
| 2026-05-16 00:00 |
17:21:58.29 |
+17:25:58.9 |
HIP 84875 |
29.25 |
| 2026-05-16 12:00 |
17:21:55.30 |
+17:26:14.9 |
HIP 84875 |
29.05 |
| 2026-05-17 00:00 |
17:21:52.30 |
+17:26:30.6 |
HIP 84875 |
28.86 |
| 2026-05-17 12:00 |
17:21:49.28 |
+17:26:46.1 |
HIP 84875 |
28.69 |
| 2026-05-18 00:00 |
17:21:46.26 |
+17:27:01.4 |
HIP 84875 |
28.54 |
| 2026-05-18 12:00 |
17:21:43.22 |
+17:27:16.4 |
HIP 84875 |
28.40 |
| 2026-05-19 00:00 |
17:21:40.17 |
+17:27:31.3 |
HIP 84875 |
28.27 |
| 2026-05-19 12:00 |
17:21:37.11 |
+17:27:45.9 |
HIP 84875 |
28.16 |
| 2026-05-20 00:00 |
17:21:34.04 |
+17:28:00.3 |
HIP 84875 |
28.07 |
| 2026-05-20 12:00 |
17:21:30.96 |
+17:28:14.4 |
HIP 84875 |
28.00 |
| 2026-05-21 00:00 |
17:21:27.87 |
+17:28:28.4 |
HIP 84875 |
27.94 |
| 2026-05-21 12:00 |
17:21:24.77 |
+17:28:42.1 |
HIP 84875 |
27.90 |
| 2026-05-22 00:00 |
17:21:21.66 |
+17:28:55.6 |
HIP 84875 |
27.87 |
| 2026-05-22 12:00 |
17:21:18.54 |
+17:29:08.8 |
HIP 84875 |
27.86 |
| 2026-05-23 00:00 |
17:21:15.41 |
+17:29:21.9 |
HIP 84875 |
27.87 |
| 2026-05-23 12:00 |
17:21:12.27 |
+17:29:34.7 |
HIP 84875 |
27.90 |
| 2026-05-24 00:00 |
17:21:09.13 |
+17:29:47.2 |
HIP 84875 |
27.95 |
| 2026-05-24 12:00 |
17:21:05.97 |
+17:29:59.6 |
HIP 84875 |
28.01 |
| 2026-05-25 00:00 |
17:21:02.81 |
+17:30:11.7 |
HIP 84875 |
28.09 |
| 2026-05-25 12:00 |
17:20:59.64 |
+17:30:23.5 |
HIP 84875 |
28.19 |
| 2026-05-26 00:00 |
17:20:56.46 |
+17:30:35.2 |
HIP 84875 |
28.30 |
| 2026-05-26 12:00 |
17:20:53.27 |
+17:30:46.6 |
HIP 84875 |
28.43 |
| 2026-05-27 00:00 |
17:20:50.08 |
+17:30:57.8 |
HIP 84875 |
28.58 |
| 2026-05-27 12:00 |
17:20:46.88 |
+17:31:08.7 |
HIP 84875 |
28.75 |
| 2026-05-28 00:00 |
17:20:43.67 |
+17:31:19.4 |
HIP 84875 |
28.93 |
| 2026-05-28 12:00 |
17:20:40.45 |
+17:31:29.9 |
HIP 84875 |
29.12 |
| 2026-05-29 00:00 |
17:20:37.23 |
+17:31:40.1 |
HIP 84875 |
29.34 |
| 2026-05-29 12:00 |
17:20:34.01 |
+17:31:50.1 |
HIP 84875 |
29.57 |
| 2026-05-30 00:00 |
17:20:30.77 |
+17:31:59.8 |
HIP 84875 |
29.81 |
| 2026-05-30 12:00 |
17:20:27.53 |
+17:32:09.3 |
HIP 84875 |
30.07 |
| 2026-05-31 00:00 |
17:20:24.29 |
+17:32:18.6 |
HIP 84875 |
30.35 |
| 2026-05-31 12:00 |
17:20:21.04 |
+17:32:27.6 |
HIP 84875 |
30.64 |
| 2026-06-01 00:00 |
17:20:17.79 |
+17:32:36.4 |
HIP 84833 |
30.83 |
| 2026-06-01 12:00 |
17:20:14.53 |
+17:32:45.0 |
HIP 84833 |
30.70 |
| 2026-06-02 00:00 |
17:20:11.26 |
+17:32:53.3 |
HIP 84833 |
30.60 |