メタデータ
| 項目 |
値 |
| Designation |
346P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-08-20T20:43:06.847680Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:55Z |
| Obs used |
553 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
12.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-10-21.0000000 |
| e |
0.50406176 |
| q (au) |
2.222599 |
| a (au) |
4.481605 |
| i (deg) |
22.172168 |
| Ω (om, deg) |
102.556632 |
| ω (w, deg) |
335.762986 |
| M (ma, deg) |
158.127468 |
等級
散乱 + 全体線形
$$
M_a = (15.872 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.872 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
03:29:01.33 |
+06:18:13.2 |
HIP 16178 |
21.16 |
| 2026-05-12 12:00 |
03:30:01.03 |
+06:23:55.5 |
HIP 16358 |
16.74 |
| 2026-05-13 00:00 |
03:31:00.79 |
+06:29:36.7 |
HIP 16358 |
18.68 |
| 2026-05-13 12:00 |
03:32:00.63 |
+06:35:16.8 |
HIP 16541 |
15.14 |
| 2026-05-14 00:00 |
03:33:00.54 |
+06:40:55.8 |
HIP 16541 |
2.35 |
| 2026-05-14 12:00 |
03:34:00.51 |
+06:46:33.6 |
HIP 16606 |
9.81 |
| 2026-05-15 00:00 |
03:35:00.56 |
+06:52:10.4 |
HIP 16689 |
4.67 |
| 2026-05-15 12:00 |
03:36:00.67 |
+06:57:45.9 |
HIP 16689 |
20.60 |
| 2026-05-16 00:00 |
03:37:00.85 |
+07:03:20.4 |
HIP 16918 |
16.94 |
| 2026-05-16 12:00 |
03:38:01.10 |
+07:08:53.7 |
HIP 16918 |
8.45 |
| 2026-05-17 00:00 |
03:39:01.42 |
+07:14:25.8 |
HIP 16918 |
19.10 |
| 2026-05-17 12:00 |
03:40:01.80 |
+07:19:56.7 |
HIP 17142 |
15.56 |
| 2026-05-18 00:00 |
03:41:02.25 |
+07:25:26.5 |
HIP 17259 |
13.24 |
| 2026-05-18 12:00 |
03:42:02.76 |
+07:30:55.1 |
HIP 17312 |
4.95 |
| 2026-05-19 00:00 |
03:43:03.34 |
+07:36:22.5 |
HIP 17312 |
11.07 |
| 2026-05-19 12:00 |
03:44:03.99 |
+07:41:48.7 |
HIP 17348 |
22.96 |
| 2026-05-20 00:00 |
03:45:04.70 |
+07:47:13.7 |
HIP 17605 |
18.56 |
| 2026-05-20 12:00 |
03:46:05.47 |
+07:52:37.4 |
HIP 17605 |
11.36 |
| 2026-05-21 00:00 |
03:47:06.30 |
+07:58:00.0 |
HIP 17605 |
20.61 |
| 2026-05-21 12:00 |
03:48:07.20 |
+08:03:21.3 |
HIP 17779 |
31.69 |
| 2026-05-22 00:00 |
03:49:08.16 |
+08:08:41.4 |
HIP 17883 |
20.12 |
| 2026-05-22 12:00 |
03:50:09.18 |
+08:14:00.3 |
HIP 17995 |
15.79 |
| 2026-05-23 00:00 |
03:51:10.26 |
+08:19:18.0 |
HIP 17995 |
9.63 |
| 2026-05-23 12:00 |
03:52:11.41 |
+08:24:34.4 |
HIP 17995 |
21.19 |
| 2026-05-24 00:00 |
03:53:12.61 |
+08:29:49.5 |
HIP 18253 |
16.07 |
| 2026-05-24 12:00 |
03:54:13.87 |
+08:35:03.4 |
HIP 18253 |
1.60 |
| 2026-05-25 00:00 |
03:55:15.20 |
+08:40:16.0 |
HIP 18253 |
16.14 |
| 2026-05-25 12:00 |
03:56:16.58 |
+08:45:27.4 |
HIP 18441 |
15.23 |
| 2026-05-26 00:00 |
03:57:18.03 |
+08:50:37.5 |
HIP 18441 |
22.94 |
| 2026-05-26 12:00 |
03:58:19.53 |
+08:55:46.3 |
HIP 18599 |
8.85 |
| 2026-05-27 00:00 |
03:59:21.09 |
+09:00:53.9 |
HIP 18599 |
8.54 |
| 2026-05-27 12:00 |
04:00:22.71 |
+09:06:00.2 |
HIP 18778 |
20.15 |
| 2026-05-28 00:00 |
04:01:24.39 |
+09:11:05.1 |
HIP 18778 |
8.97 |
| 2026-05-28 12:00 |
04:02:26.12 |
+09:16:08.8 |
HIP 18893 |
8.98 |
| 2026-05-29 00:00 |
04:03:27.92 |
+09:21:11.2 |
HIP 18893 |
11.15 |
| 2026-05-29 12:00 |
04:04:29.77 |
+09:26:12.3 |
HIP 18893 |
26.14 |
| 2026-05-30 00:00 |
04:05:31.68 |
+09:31:12.1 |
HIP 19103 |
31.12 |
| 2026-05-30 12:00 |
04:06:33.65 |
+09:36:10.6 |
HIP 19257 |
17.49 |
| 2026-05-31 00:00 |
04:07:35.67 |
+09:41:07.7 |
HIP 19257 |
11.52 |
| 2026-05-31 12:00 |
04:08:37.75 |
+09:46:03.5 |
HIP 19348 |
19.94 |
| 2026-06-01 00:00 |
04:09:39.89 |
+09:50:58.0 |
HIP 19348 |
20.67 |
| 2026-06-01 12:00 |
04:10:42.08 |
+09:55:51.2 |
HIP 19348 |
31.22 |
| 2026-06-02 00:00 |
04:11:44.33 |
+10:00:43.0 |
HIP 19720 |
29.68 |