メタデータ
| 項目 |
値 |
| Designation |
C/1961 T1 (Seki) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1961-10-10T15:34:49.782720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
15 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1961-11-12.0000000 |
| e |
0.99215002 |
| q (au) |
0.681202 |
| a (au) |
86.777590 |
| i (deg) |
155.712858 |
| Ω (om, deg) |
247.357198 |
| ω (w, deg) |
126.592481 |
| M (ma, deg) |
0.039444 |
等級
散乱 + 全体線形
$$
M_a = (9.055 + 4.579\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.055 |
| n |
4.579 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
21:02:55.02 |
-38:34:02.9 |
HIP 103882 |
3.87 |
| 2026-03-26 12:00 |
21:02:56.14 |
-38:34:05.6 |
HIP 103882 |
3.79 |
| 2026-03-27 00:00 |
21:02:57.24 |
-38:34:08.5 |
HIP 103882 |
3.73 |
| 2026-03-27 12:00 |
21:02:58.33 |
-38:34:11.4 |
HIP 103882 |
3.68 |
| 2026-03-28 00:00 |
21:02:59.41 |
-38:34:14.4 |
HIP 103882 |
3.64 |
| 2026-03-28 12:00 |
21:03:00.48 |
-38:34:17.5 |
HIP 103882 |
3.61 |
| 2026-03-29 00:00 |
21:03:01.53 |
-38:34:20.7 |
HIP 103882 |
3.59 |
| 2026-03-29 12:00 |
21:03:02.57 |
-38:34:23.9 |
HIP 103882 |
3.59 |
| 2026-03-30 00:00 |
21:03:03.60 |
-38:34:27.3 |
HIP 103882 |
3.59 |
| 2026-03-30 12:00 |
21:03:04.62 |
-38:34:30.7 |
HIP 103882 |
3.60 |
| 2026-03-31 00:00 |
21:03:05.62 |
-38:34:34.2 |
HIP 103882 |
3.62 |
| 2026-03-31 12:00 |
21:03:06.61 |
-38:34:37.8 |
HIP 103882 |
3.65 |
| 2026-04-01 00:00 |
21:03:07.59 |
-38:34:41.4 |
HIP 103882 |
3.69 |
| 2026-04-01 12:00 |
21:03:08.55 |
-38:34:45.2 |
HIP 103882 |
3.74 |
| 2026-04-02 00:00 |
21:03:09.50 |
-38:34:49.0 |
HIP 103882 |
3.79 |
| 2026-04-02 12:00 |
21:03:10.44 |
-38:34:52.9 |
HIP 103882 |
3.86 |
| 2026-04-03 00:00 |
21:03:11.36 |
-38:34:56.9 |
HIP 103882 |
3.92 |
| 2026-04-03 12:00 |
21:03:12.27 |
-38:35:01.0 |
HIP 103882 |
3.99 |
| 2026-04-04 00:00 |
21:03:13.17 |
-38:35:05.1 |
HIP 103882 |
4.07 |
| 2026-04-04 12:00 |
21:03:14.06 |
-38:35:09.3 |
HIP 103882 |
4.15 |
| 2026-04-05 00:00 |
21:03:14.93 |
-38:35:13.6 |
HIP 103882 |
4.24 |
| 2026-04-05 12:00 |
21:03:15.79 |
-38:35:18.0 |
HIP 103882 |
4.33 |
| 2026-04-06 00:00 |
21:03:16.63 |
-38:35:22.5 |
HIP 103882 |
4.42 |
| 2026-04-06 12:00 |
21:03:17.46 |
-38:35:27.0 |
HIP 103882 |
4.51 |
| 2026-04-07 00:00 |
21:03:18.28 |
-38:35:31.6 |
HIP 103882 |
4.61 |
| 2026-04-07 12:00 |
21:03:19.08 |
-38:35:36.3 |
HIP 103882 |
4.70 |
| 2026-04-08 00:00 |
21:03:19.87 |
-38:35:41.1 |
HIP 103882 |
4.80 |
| 2026-04-08 12:00 |
21:03:20.64 |
-38:35:45.9 |
HIP 103882 |
4.90 |
| 2026-04-09 00:00 |
21:03:21.40 |
-38:35:50.8 |
HIP 103882 |
5.00 |
| 2026-04-09 12:00 |
21:03:22.15 |
-38:35:55.8 |
HIP 103882 |
5.11 |
| 2026-04-10 00:00 |
21:03:22.89 |
-38:36:00.9 |
HIP 103882 |
5.21 |
| 2026-04-10 12:00 |
21:03:23.60 |
-38:36:06.1 |
HIP 103882 |
5.31 |
| 2026-04-11 00:00 |
21:03:24.31 |
-38:36:11.3 |
HIP 103882 |
5.41 |
| 2026-04-11 12:00 |
21:03:25.00 |
-38:36:16.6 |
HIP 103882 |
5.51 |
| 2026-04-12 00:00 |
21:03:25.68 |
-38:36:22.0 |
HIP 103882 |
5.62 |
| 2026-04-12 12:00 |
21:03:26.34 |
-38:36:27.4 |
HIP 103882 |
5.72 |
| 2026-04-13 00:00 |
21:03:26.99 |
-38:36:32.9 |
HIP 103882 |
5.82 |
| 2026-04-13 12:00 |
21:03:27.62 |
-38:36:38.5 |
HIP 103882 |
5.92 |
| 2026-04-14 00:00 |
21:03:28.24 |
-38:36:44.2 |
HIP 103882 |
6.02 |
| 2026-04-14 12:00 |
21:03:28.84 |
-38:36:49.9 |
HIP 103882 |
6.12 |
| 2026-04-15 00:00 |
21:03:29.43 |
-38:36:55.7 |
HIP 103882 |
6.22 |
| 2026-04-15 12:00 |
21:03:30.00 |
-38:37:01.6 |
HIP 103882 |
6.31 |
| 2026-04-16 00:00 |
21:03:30.56 |
-38:37:07.6 |
HIP 103882 |
6.41 |