メタデータ
| 項目 |
値 |
| Designation |
300P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-11-02T01:00:23.175360Z |
| Orbit solution date (soln_date, UTC) |
2023-11-14T12:36:26Z |
| Obs used |
148 |
| NEO |
Yes |
| M1 |
16.800 |
| K1 |
20.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-01-04.0000000 |
| e |
0.69162623 |
| q (au) |
0.832296 |
| a (au) |
2.698984 |
| i (deg) |
5.675932 |
| Ω (om, deg) |
95.686317 |
| ω (w, deg) |
222.865728 |
| M (ma, deg) |
292.861604 |
等級
散乱 + 全体線形
$$
M_a = (17.367 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.367 |
| n |
6.000 |
| gf |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2023-02-17 |
2023-04-11 |
+15.3858 |
+0.614 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
09:55:33.72 |
+17:50:42.3 |
HIP 48700 |
18.97 |
| 2026-06-01 12:00 |
09:55:46.97 |
+17:49:04.4 |
HIP 48700 |
16.72 |
| 2026-06-02 00:00 |
09:56:00.41 |
+17:47:25.8 |
HIP 48700 |
14.97 |
| 2026-06-02 12:00 |
09:56:14.03 |
+17:45:46.2 |
HIP 48700 |
13.95 |
| 2026-06-03 00:00 |
09:56:27.84 |
+17:44:05.8 |
HIP 48744 |
13.83 |
| 2026-06-03 12:00 |
09:56:41.82 |
+17:42:24.6 |
HIP 48744 |
12.31 |
| 2026-06-04 00:00 |
09:56:55.98 |
+17:40:42.5 |
HIP 48744 |
11.82 |
| 2026-06-04 12:00 |
09:57:10.32 |
+17:38:59.6 |
HIP 48744 |
12.54 |
| 2026-06-05 00:00 |
09:57:24.84 |
+17:37:15.9 |
HIP 48744 |
14.30 |
| 2026-06-05 12:00 |
09:57:39.53 |
+17:35:31.3 |
HIP 48744 |
16.83 |
| 2026-06-06 00:00 |
09:57:54.39 |
+17:33:45.9 |
HIP 48744 |
19.85 |
| 2026-06-06 12:00 |
09:58:09.43 |
+17:31:59.6 |
HIP 48744 |
23.19 |
| 2026-06-07 00:00 |
09:58:24.64 |
+17:30:12.6 |
HIP 49033 |
26.38 |
| 2026-06-07 12:00 |
09:58:40.02 |
+17:28:24.7 |
HIP 49033 |
22.60 |
| 2026-06-08 00:00 |
09:58:55.57 |
+17:26:36.0 |
HIP 49033 |
18.91 |
| 2026-06-08 12:00 |
09:59:11.29 |
+17:24:46.5 |
HIP 49033 |
15.39 |
| 2026-06-09 00:00 |
09:59:27.17 |
+17:22:56.2 |
HIP 49033 |
12.26 |
| 2026-06-09 12:00 |
09:59:43.23 |
+17:21:05.1 |
HIP 49033 |
9.94 |
| 2026-06-10 00:00 |
09:59:59.45 |
+17:19:13.1 |
HIP 49033 |
9.13 |
| 2026-06-10 12:00 |
10:00:15.83 |
+17:17:20.4 |
HIP 49033 |
10.25 |
| 2026-06-11 00:00 |
10:00:32.38 |
+17:15:26.9 |
HIP 49033 |
12.85 |
| 2026-06-11 12:00 |
10:00:49.09 |
+17:13:32.6 |
HIP 49033 |
16.26 |
| 2026-06-12 00:00 |
10:01:05.96 |
+17:11:37.6 |
HIP 49136 |
15.32 |
| 2026-06-12 12:00 |
10:01:22.99 |
+17:09:41.7 |
HIP 49136 |
15.43 |
| 2026-06-13 00:00 |
10:01:40.18 |
+17:07:45.1 |
HIP 49204 |
13.83 |
| 2026-06-13 12:00 |
10:01:57.52 |
+17:05:47.7 |
HIP 49204 |
9.27 |
| 2026-06-14 00:00 |
10:02:15.03 |
+17:03:49.5 |
HIP 49204 |
4.70 |
| 2026-06-14 12:00 |
10:02:32.69 |
+17:01:50.5 |
HIP 49204 |
1.01 |
| 2026-06-15 00:00 |
10:02:50.50 |
+16:59:50.8 |
HIP 49204 |
4.88 |
| 2026-06-15 12:00 |
10:03:08.47 |
+16:57:50.4 |
HIP 49204 |
9.57 |
| 2026-06-16 00:00 |
10:03:26.59 |
+16:55:49.2 |
HIP 49204 |
14.33 |
| 2026-06-16 12:00 |
10:03:44.86 |
+16:53:47.2 |
HIP 49204 |
19.14 |
| 2026-06-17 00:00 |
10:04:03.28 |
+16:51:44.5 |
HIP 49204 |
23.99 |
| 2026-06-17 12:00 |
10:04:21.85 |
+16:49:41.1 |
HIP 49422 |
25.50 |
| 2026-06-18 00:00 |
10:04:40.57 |
+16:47:36.9 |
HIP 49422 |
21.57 |
| 2026-06-18 12:00 |
10:04:59.43 |
+16:45:32.0 |
HIP 49422 |
18.13 |
| 2026-06-19 00:00 |
10:05:18.44 |
+16:43:26.4 |
HIP 49422 |
15.52 |
| 2026-06-19 12:00 |
10:05:37.59 |
+16:41:20.1 |
HIP 49422 |
14.26 |
| 2026-06-20 00:00 |
10:05:56.88 |
+16:39:13.1 |
HIP 49422 |
14.73 |
| 2026-06-20 12:00 |
10:06:16.31 |
+16:37:05.3 |
HIP 49422 |
16.83 |
| 2026-06-21 00:00 |
10:06:35.88 |
+16:34:56.9 |
HIP 49583 |
15.11 |
| 2026-06-21 12:00 |
10:06:55.59 |
+16:32:47.7 |
HIP 49583 |
14.22 |
| 2026-06-22 00:00 |
10:07:15.44 |
+16:30:37.9 |
HIP 49583 |
15.17 |