メタデータ
| 項目 |
値 |
| Designation |
C/2016 E2 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-02-06T16:22:22.641600Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:07Z |
| Obs used |
108 |
| NEO |
- |
| M1 |
20.700 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-03-19.0000000 |
| e |
1.00022643 |
| q (au) |
1.075383 |
| a (au) |
-4749.316616 |
| i (deg) |
135.997156 |
| Ω (om, deg) |
186.665157 |
| ω (w, deg) |
321.971509 |
| M (ma, deg) |
0.000124 |
等級
散乱 + 全体線形
$$
M_a = (19.818 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.818 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.877 |
| 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) |
| 2026-03-26 00:00 |
02:47:22.27 |
+55:07:36.5 |
HIP 13056 |
10.71 |
| 2026-03-26 12:00 |
02:47:27.89 |
+55:07:18.4 |
HIP 13056 |
10.17 |
| 2026-03-27 00:00 |
02:47:33.56 |
+55:07:00.5 |
HIP 13056 |
9.68 |
| 2026-03-27 12:00 |
02:47:39.25 |
+55:06:43.1 |
HIP 13056 |
9.25 |
| 2026-03-28 00:00 |
02:47:44.99 |
+55:06:26.0 |
HIP 13056 |
8.90 |
| 2026-03-28 12:00 |
02:47:50.76 |
+55:06:09.3 |
HIP 13056 |
8.62 |
| 2026-03-29 00:00 |
02:47:56.56 |
+55:05:53.0 |
HIP 13056 |
8.43 |
| 2026-03-29 12:00 |
02:48:02.40 |
+55:05:37.0 |
HIP 13056 |
8.34 |
| 2026-03-30 00:00 |
02:48:08.27 |
+55:05:21.5 |
HIP 13056 |
8.34 |
| 2026-03-30 12:00 |
02:48:14.17 |
+55:05:06.3 |
HIP 13056 |
8.45 |
| 2026-03-31 00:00 |
02:48:20.11 |
+55:04:51.4 |
HIP 13056 |
8.65 |
| 2026-03-31 12:00 |
02:48:26.08 |
+55:04:36.9 |
HIP 13056 |
8.95 |
| 2026-04-01 00:00 |
02:48:32.08 |
+55:04:22.8 |
HIP 13056 |
9.33 |
| 2026-04-01 12:00 |
02:48:38.11 |
+55:04:09.1 |
HIP 13056 |
9.78 |
| 2026-04-02 00:00 |
02:48:44.18 |
+55:03:55.8 |
HIP 13056 |
10.30 |
| 2026-04-02 12:00 |
02:48:50.27 |
+55:03:42.8 |
HIP 13056 |
10.87 |
| 2026-04-03 00:00 |
02:48:56.40 |
+55:03:30.2 |
HIP 13056 |
11.50 |
| 2026-04-03 12:00 |
02:49:02.55 |
+55:03:17.9 |
HIP 13056 |
12.16 |
| 2026-04-04 00:00 |
02:49:08.73 |
+55:03:06.1 |
HIP 13056 |
12.87 |
| 2026-04-04 12:00 |
02:49:14.95 |
+55:02:54.6 |
HIP 13056 |
13.60 |
| 2026-04-05 00:00 |
02:49:21.19 |
+55:02:43.4 |
HIP 13056 |
14.36 |
| 2026-04-05 12:00 |
02:49:27.46 |
+55:02:32.7 |
HIP 13056 |
15.14 |
| 2026-04-06 00:00 |
02:49:33.76 |
+55:02:22.3 |
HIP 13056 |
15.94 |
| 2026-04-06 12:00 |
02:49:40.08 |
+55:02:12.3 |
HIP 13056 |
16.76 |
| 2026-04-07 00:00 |
02:49:46.44 |
+55:02:02.6 |
HIP 13056 |
17.60 |
| 2026-04-07 12:00 |
02:49:52.82 |
+55:01:53.4 |
HIP 13056 |
18.45 |
| 2026-04-08 00:00 |
02:49:59.22 |
+55:01:44.5 |
HIP 13056 |
19.31 |
| 2026-04-08 12:00 |
02:50:05.65 |
+55:01:35.9 |
HIP 13056 |
20.18 |
| 2026-04-09 00:00 |
02:50:12.11 |
+55:01:27.8 |
HIP 13056 |
21.07 |
| 2026-04-09 12:00 |
02:50:18.59 |
+55:01:20.0 |
HIP 13056 |
21.96 |
| 2026-04-10 00:00 |
02:50:25.10 |
+55:01:12.5 |
HIP 13056 |
22.86 |
| 2026-04-10 12:00 |
02:50:31.63 |
+55:01:05.5 |
HIP 13056 |
23.77 |
| 2026-04-11 00:00 |
02:50:38.18 |
+55:00:58.8 |
HIP 13056 |
24.68 |
| 2026-04-11 12:00 |
02:50:44.76 |
+55:00:52.5 |
HIP 13056 |
25.60 |
| 2026-04-12 00:00 |
02:50:51.36 |
+55:00:46.5 |
HIP 13056 |
26.53 |
| 2026-04-12 12:00 |
02:50:57.98 |
+55:00:41.0 |
HIP 13056 |
27.46 |
| 2026-04-13 00:00 |
02:51:04.62 |
+55:00:35.8 |
HIP 13056 |
28.40 |
| 2026-04-13 12:00 |
02:51:11.29 |
+55:00:30.9 |
HIP 13056 |
29.34 |
| 2026-04-14 00:00 |
02:51:17.97 |
+55:00:26.4 |
HIP 13056 |
30.29 |
| 2026-04-14 12:00 |
02:51:24.68 |
+55:00:22.3 |
HIP 13585 |
30.85 |
| 2026-04-15 00:00 |
02:51:31.41 |
+55:00:18.6 |
HIP 13585 |
29.89 |
| 2026-04-15 12:00 |
02:51:38.15 |
+55:00:15.2 |
HIP 13585 |
28.92 |
| 2026-04-16 00:00 |
02:51:44.92 |
+55:00:12.2 |
HIP 13585 |
27.96 |