メタデータ
| 項目 |
値 |
| Designation |
P/2009 Y2 (Kowalski) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-03-30T16:39:00.302400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:38Z |
| Obs used |
178 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
28.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-01-11.0000000 |
| e |
0.64052556 |
| q (au) |
2.339193 |
| a (au) |
6.507258 |
| i (deg) |
29.929609 |
| Ω (om, deg) |
262.126517 |
| ω (w, deg) |
171.961934 |
| M (ma, deg) |
355.327521 |
等級
散乱 + 全体線形
$$
M_a = (10.523 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.523 |
| n |
6.000 |
| gf |
0.991 |
| gb |
-0.502 |
| k |
1.000 |
| δ90 |
9.996 |
| 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) |
| 2026-06-01 00:00 |
01:27:53.00 |
+32:46:57.2 |
HIP 7012 |
36.71 |
| 2026-06-01 12:00 |
01:28:46.46 |
+32:51:37.9 |
HIP 7012 |
24.94 |
| 2026-06-02 00:00 |
01:29:39.97 |
+32:56:18.3 |
HIP 7012 |
13.85 |
| 2026-06-02 12:00 |
01:30:33.53 |
+33:00:58.2 |
HIP 7012 |
7.58 |
| 2026-06-03 00:00 |
01:31:27.15 |
+33:05:37.7 |
HIP 7012 |
14.78 |
| 2026-06-03 12:00 |
01:32:20.81 |
+33:10:16.7 |
HIP 7012 |
25.98 |
| 2026-06-04 00:00 |
01:33:14.53 |
+33:14:55.3 |
HIP 7370 |
23.05 |
| 2026-06-04 12:00 |
01:34:08.29 |
+33:19:33.5 |
HIP 7370 |
16.25 |
| 2026-06-05 00:00 |
01:35:02.11 |
+33:24:11.2 |
HIP 7370 |
17.12 |
| 2026-06-05 12:00 |
01:35:55.98 |
+33:28:48.4 |
HIP 7522 |
15.72 |
| 2026-06-06 00:00 |
01:36:49.90 |
+33:33:25.1 |
HIP 7522 |
6.19 |
| 2026-06-06 12:00 |
01:37:43.86 |
+33:38:01.4 |
HIP 7522 |
11.15 |
| 2026-06-07 00:00 |
01:38:37.88 |
+33:42:37.1 |
HIP 7522 |
22.47 |
| 2026-06-07 12:00 |
01:39:31.95 |
+33:47:12.4 |
HIP 7781 |
23.38 |
| 2026-06-08 00:00 |
01:40:26.06 |
+33:51:47.1 |
HIP 7781 |
26.84 |
| 2026-06-08 12:00 |
01:41:20.22 |
+33:56:21.3 |
HIP 7808 |
26.48 |
| 2026-06-09 00:00 |
01:42:14.44 |
+34:00:54.9 |
HIP 7808 |
29.67 |
| 2026-06-09 12:00 |
01:43:08.69 |
+34:05:28.0 |
HIP 8214 |
35.56 |
| 2026-06-10 00:00 |
01:44:03.00 |
+34:10:00.6 |
HIP 8214 |
28.45 |
| 2026-06-10 12:00 |
01:44:57.35 |
+34:14:32.6 |
HIP 8214 |
25.47 |
| 2026-06-11 00:00 |
01:45:51.75 |
+34:19:04.0 |
HIP 8214 |
27.98 |
| 2026-06-11 12:00 |
01:46:46.19 |
+34:23:34.9 |
HIP 8203 |
32.45 |
| 2026-06-12 00:00 |
01:47:40.68 |
+34:28:05.1 |
HIP 8468 |
30.76 |
| 2026-06-12 12:00 |
01:48:35.22 |
+34:32:34.7 |
HIP 8471 |
23.02 |
| 2026-06-13 00:00 |
01:49:29.79 |
+34:37:03.8 |
HIP 8471 |
17.54 |
| 2026-06-13 12:00 |
01:50:24.41 |
+34:41:32.1 |
HIP 8471 |
19.42 |
| 2026-06-14 00:00 |
01:51:19.07 |
+34:46:00.0 |
HIP 8471 |
27.18 |
| 2026-06-14 12:00 |
01:52:13.78 |
+34:50:27.0 |
HIP 8471 |
37.29 |
| 2026-06-15 00:00 |
01:53:08.52 |
+34:54:53.5 |
HIP 9023 |
37.51 |
| 2026-06-15 12:00 |
01:54:03.31 |
+34:59:19.2 |
HIP 9023 |
25.94 |
| 2026-06-16 00:00 |
01:54:58.13 |
+35:03:44.3 |
HIP 9023 |
15.18 |
| 2026-06-16 12:00 |
01:55:53.00 |
+35:08:08.7 |
HIP 9023 |
8.90 |
| 2026-06-17 00:00 |
01:56:47.90 |
+35:12:32.4 |
HIP 9023 |
14.79 |
| 2026-06-17 12:00 |
01:57:42.84 |
+35:16:55.4 |
HIP 9060 |
25.43 |
| 2026-06-18 00:00 |
01:58:37.82 |
+35:21:17.7 |
HIP 9421 |
29.75 |
| 2026-06-18 12:00 |
01:59:32.84 |
+35:25:39.2 |
HIP 9421 |
19.86 |
| 2026-06-19 00:00 |
02:00:27.89 |
+35:30:00.0 |
HIP 9426 |
13.88 |
| 2026-06-19 12:00 |
02:01:22.98 |
+35:34:20.0 |
HIP 9426 |
16.38 |
| 2026-06-20 00:00 |
02:02:18.11 |
+35:38:39.3 |
HIP 9630 |
18.37 |
| 2026-06-20 12:00 |
02:03:13.27 |
+35:42:57.7 |
HIP 9630 |
10.17 |
| 2026-06-21 00:00 |
02:04:08.47 |
+35:47:15.5 |
HIP 9630 |
12.55 |
| 2026-06-21 12:00 |
02:05:03.70 |
+35:51:32.4 |
HIP 9630 |
22.34 |
| 2026-06-22 00:00 |
02:05:58.96 |
+35:55:48.5 |
HIP 9917 |
30.20 |