C/2011 S2 (Kowalski)
メタデータ
| 項目 |
値 |
| Designation |
C/2011 S2 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-10-26T08:20:46.965120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:56Z |
| Obs used |
343 |
| NEO |
Yes |
| M1 |
15.600 |
| 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) |
2011-10-23.0000000 |
| e |
0.93161485 |
| q (au) |
1.115120 |
| a (au) |
16.306469 |
| i (deg) |
17.572538 |
| Ω (om, deg) |
288.070325 |
| ω (w, deg) |
192.189985 |
| M (ma, deg) |
359.949891 |
等級
散乱 + 全体線形
$$
M_a = (15.975 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.975 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.701 |
| 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) |
| 2026-02-03 00:00 |
19:24:16.58 |
-21:52:42.4 |
HIP 95417 |
11.71 |
| 2026-02-03 12:00 |
19:24:21.42 |
-21:52:31.4 |
HIP 95417 |
11.54 |
| 2026-02-04 00:00 |
19:24:26.25 |
-21:52:20.3 |
HIP 95417 |
11.48 |
| 2026-02-04 12:00 |
19:24:31.05 |
-21:52:09.3 |
HIP 95417 |
11.54 |
| 2026-02-05 00:00 |
19:24:35.84 |
-21:51:58.2 |
HIP 95417 |
11.70 |
| 2026-02-05 12:00 |
19:24:40.61 |
-21:51:47.3 |
HIP 95417 |
11.96 |
| 2026-02-06 00:00 |
19:24:45.37 |
-21:51:36.3 |
HIP 95417 |
12.33 |
| 2026-02-06 12:00 |
19:24:50.10 |
-21:51:25.4 |
HIP 95417 |
12.77 |
| 2026-02-07 00:00 |
19:24:54.81 |
-21:51:14.5 |
HIP 95417 |
13.30 |
| 2026-02-07 12:00 |
19:24:59.51 |
-21:51:03.6 |
HIP 95417 |
13.89 |
| 2026-02-08 00:00 |
19:25:04.18 |
-21:50:52.8 |
HIP 95417 |
14.53 |
| 2026-02-08 12:00 |
19:25:08.83 |
-21:50:41.9 |
HIP 95417 |
15.23 |
| 2026-02-09 00:00 |
19:25:13.47 |
-21:50:31.2 |
HIP 95564 |
15.74 |
| 2026-02-09 12:00 |
19:25:18.08 |
-21:50:20.4 |
HIP 95564 |
14.66 |
| 2026-02-10 00:00 |
19:25:22.67 |
-21:50:09.7 |
HIP 95564 |
13.58 |
| 2026-02-10 12:00 |
19:25:27.24 |
-21:49:59.0 |
HIP 95564 |
12.51 |
| 2026-02-11 00:00 |
19:25:31.79 |
-21:49:48.4 |
HIP 95564 |
11.45 |
| 2026-02-11 12:00 |
19:25:36.32 |
-21:49:37.8 |
HIP 95564 |
10.39 |
| 2026-02-12 00:00 |
19:25:40.82 |
-21:49:27.2 |
HIP 95564 |
9.34 |
| 2026-02-12 12:00 |
19:25:45.30 |
-21:49:16.6 |
HIP 95564 |
8.30 |
| 2026-02-13 00:00 |
19:25:49.76 |
-21:49:06.1 |
HIP 95564 |
7.26 |
| 2026-02-13 12:00 |
19:25:54.19 |
-21:48:55.7 |
HIP 95564 |
6.24 |
| 2026-02-14 00:00 |
19:25:58.60 |
-21:48:45.2 |
HIP 95564 |
5.23 |
| 2026-02-14 12:00 |
19:26:02.99 |
-21:48:34.9 |
HIP 95564 |
4.24 |
| 2026-02-15 00:00 |
19:26:07.35 |
-21:48:24.5 |
HIP 95564 |
3.28 |
| 2026-02-15 12:00 |
19:26:11.69 |
-21:48:14.2 |
HIP 95564 |
2.38 |
| 2026-02-16 00:00 |
19:26:16.01 |
-21:48:03.9 |
HIP 95564 |
1.63 |
| 2026-02-16 12:00 |
19:26:20.29 |
-21:47:53.7 |
HIP 95564 |
1.32 |
| 2026-02-17 00:00 |
19:26:24.56 |
-21:47:43.5 |
HIP 95564 |
1.69 |
| 2026-02-17 12:00 |
19:26:28.79 |
-21:47:33.4 |
HIP 95564 |
2.44 |
| 2026-02-18 00:00 |
19:26:33.00 |
-21:47:23.3 |
HIP 95564 |
3.31 |
| 2026-02-18 12:00 |
19:26:37.19 |
-21:47:13.3 |
HIP 95564 |
4.24 |
| 2026-02-19 00:00 |
19:26:41.34 |
-21:47:03.3 |
HIP 95564 |
5.18 |
| 2026-02-19 12:00 |
19:26:45.47 |
-21:46:53.3 |
HIP 95564 |
6.12 |
| 2026-02-20 00:00 |
19:26:49.58 |
-21:46:43.4 |
HIP 95564 |
7.07 |
| 2026-02-20 12:00 |
19:26:53.65 |
-21:46:33.6 |
HIP 95564 |
8.01 |
| 2026-02-21 00:00 |
19:26:57.70 |
-21:46:23.8 |
HIP 95564 |
8.96 |
| 2026-02-21 12:00 |
19:27:01.72 |
-21:46:14.0 |
HIP 95564 |
9.89 |
| 2026-02-22 00:00 |
19:27:05.71 |
-21:46:04.3 |
HIP 95564 |
10.83 |
| 2026-02-22 12:00 |
19:27:09.67 |
-21:45:54.7 |
HIP 95564 |
11.75 |
| 2026-02-23 00:00 |
19:27:13.60 |
-21:45:45.1 |
HIP 95564 |
12.68 |
| 2026-02-23 12:00 |
19:27:17.51 |
-21:45:35.5 |
HIP 95564 |
13.59 |
| 2026-02-24 00:00 |
19:27:21.38 |
-21:45:26.0 |
HIP 95564 |
14.50 |