メタデータ
| 項目 |
値 |
| Designation |
C/1967 C1 (Seki) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1967-03-13T17:47:57.289920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1967-02-14.0000000 |
| e |
0.99990293 |
| q (au) |
0.457380 |
| a (au) |
4712.068054 |
| i (deg) |
106.468426 |
| Ω (om, deg) |
200.519565 |
| ω (w, deg) |
144.290739 |
| M (ma, deg) |
359.999915 |
等級
散乱 + 全体線形
$$
M_a = (10.171 + 3.612\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.171 |
| n |
3.612 |
| gf |
1.000 |
| gb |
-0.983 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
12:49:08.08 |
-51:13:55.3 |
HIP 62547 |
9.76 |
| 2026-09-20 12:00 |
12:49:10.05 |
-51:13:56.5 |
HIP 62547 |
9.81 |
| 2026-09-21 00:00 |
12:49:12.02 |
-51:13:57.9 |
HIP 62547 |
9.86 |
| 2026-09-21 12:00 |
12:49:13.99 |
-51:13:59.4 |
HIP 62547 |
9.92 |
| 2026-09-22 00:00 |
12:49:15.97 |
-51:14:01.0 |
HIP 62547 |
9.99 |
| 2026-09-22 12:00 |
12:49:17.95 |
-51:14:02.7 |
HIP 62547 |
10.06 |
| 2026-09-23 00:00 |
12:49:19.94 |
-51:14:04.6 |
HIP 62547 |
10.14 |
| 2026-09-23 12:00 |
12:49:21.93 |
-51:14:06.6 |
HIP 62547 |
10.23 |
| 2026-09-24 00:00 |
12:49:23.92 |
-51:14:08.7 |
HIP 62547 |
10.32 |
| 2026-09-24 12:00 |
12:49:25.92 |
-51:14:11.0 |
HIP 62547 |
10.42 |
| 2026-09-25 00:00 |
12:49:27.92 |
-51:14:13.4 |
HIP 62547 |
10.53 |
| 2026-09-25 12:00 |
12:49:29.92 |
-51:14:16.0 |
HIP 62547 |
10.65 |
| 2026-09-26 00:00 |
12:49:31.93 |
-51:14:18.6 |
HIP 62547 |
10.77 |
| 2026-09-26 12:00 |
12:49:33.94 |
-51:14:21.4 |
HIP 62547 |
10.90 |
| 2026-09-27 00:00 |
12:49:35.95 |
-51:14:24.4 |
HIP 62547 |
11.03 |
| 2026-09-27 12:00 |
12:49:37.97 |
-51:14:27.4 |
HIP 62547 |
11.17 |
| 2026-09-28 00:00 |
12:49:39.99 |
-51:14:30.6 |
HIP 62547 |
11.31 |
| 2026-09-28 12:00 |
12:49:42.01 |
-51:14:33.9 |
HIP 62547 |
11.47 |
| 2026-09-29 00:00 |
12:49:44.04 |
-51:14:37.4 |
HIP 62547 |
11.62 |
| 2026-09-29 12:00 |
12:49:46.06 |
-51:14:41.0 |
HIP 62547 |
11.78 |
| 2026-09-30 00:00 |
12:49:48.09 |
-51:14:44.7 |
HIP 62547 |
11.95 |
| 2026-09-30 12:00 |
12:49:50.12 |
-51:14:48.5 |
HIP 62547 |
12.12 |
| 2026-10-01 00:00 |
12:49:52.16 |
-51:14:52.5 |
HIP 62547 |
12.30 |
| 2026-10-01 12:00 |
12:49:54.19 |
-51:14:56.6 |
HIP 62547 |
12.48 |
| 2026-10-02 00:00 |
12:49:56.23 |
-51:15:00.9 |
HIP 62547 |
12.67 |
| 2026-10-02 12:00 |
12:49:58.27 |
-51:15:05.2 |
HIP 62547 |
12.86 |
| 2026-10-03 00:00 |
12:50:00.30 |
-51:15:09.7 |
HIP 62547 |
13.05 |
| 2026-10-03 12:00 |
12:50:02.35 |
-51:15:14.3 |
HIP 62547 |
13.25 |
| 2026-10-04 00:00 |
12:50:04.39 |
-51:15:19.1 |
HIP 62547 |
13.45 |
| 2026-10-04 12:00 |
12:50:06.43 |
-51:15:24.0 |
HIP 62547 |
13.66 |
| 2026-10-05 00:00 |
12:50:08.47 |
-51:15:29.0 |
HIP 62547 |
13.87 |
| 2026-10-05 12:00 |
12:50:10.52 |
-51:15:34.1 |
HIP 62547 |
14.08 |
| 2026-10-06 00:00 |
12:50:12.56 |
-51:15:39.4 |
HIP 62547 |
14.30 |
| 2026-10-06 12:00 |
12:50:14.61 |
-51:15:44.8 |
HIP 62547 |
14.52 |
| 2026-10-07 00:00 |
12:50:16.66 |
-51:15:50.3 |
HIP 62547 |
14.74 |
| 2026-10-07 12:00 |
12:50:18.70 |
-51:15:55.9 |
HIP 62547 |
14.97 |
| 2026-10-08 00:00 |
12:50:20.75 |
-51:16:01.7 |
HIP 62689 |
15.01 |
| 2026-10-08 12:00 |
12:50:22.79 |
-51:16:07.6 |
HIP 62689 |
14.84 |
| 2026-10-09 00:00 |
12:50:24.84 |
-51:16:13.6 |
HIP 62689 |
14.67 |
| 2026-10-09 12:00 |
12:50:26.88 |
-51:16:19.8 |
HIP 62689 |
14.51 |
| 2026-10-10 00:00 |
12:50:28.93 |
-51:16:26.0 |
HIP 62689 |
14.35 |
| 2026-10-10 12:00 |
12:50:30.97 |
-51:16:32.4 |
HIP 62689 |
14.20 |
| 2026-10-11 00:00 |
12:50:33.01 |
-51:16:38.9 |
HIP 62689 |
14.05 |