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) |
| 2026-05-12 00:00 |
09:49:28.66 |
+18:43:03.7 |
HIP 48196 |
4.07 |
| 2026-05-12 12:00 |
09:49:33.51 |
+18:42:05.2 |
HIP 48196 |
3.05 |
| 2026-05-13 00:00 |
09:49:38.60 |
+18:41:05.6 |
HIP 48196 |
2.58 |
| 2026-05-13 12:00 |
09:49:43.92 |
+18:40:04.9 |
HIP 48196 |
3.03 |
| 2026-05-14 00:00 |
09:49:49.47 |
+18:39:03.0 |
HIP 48196 |
4.17 |
| 2026-05-14 12:00 |
09:49:55.26 |
+18:38:00.1 |
HIP 48196 |
5.64 |
| 2026-05-15 00:00 |
09:50:01.27 |
+18:36:56.1 |
HIP 48196 |
7.29 |
| 2026-05-15 12:00 |
09:50:07.52 |
+18:35:51.0 |
HIP 48196 |
9.04 |
| 2026-05-16 00:00 |
09:50:13.99 |
+18:34:44.9 |
HIP 48196 |
10.88 |
| 2026-05-16 12:00 |
09:50:20.69 |
+18:33:37.6 |
HIP 48196 |
12.78 |
| 2026-05-17 00:00 |
09:50:27.61 |
+18:32:29.4 |
HIP 48196 |
14.76 |
| 2026-05-17 12:00 |
09:50:34.76 |
+18:31:20.0 |
HIP 48366 |
16.20 |
| 2026-05-18 00:00 |
09:50:42.14 |
+18:30:09.6 |
HIP 48366 |
14.13 |
| 2026-05-18 12:00 |
09:50:49.73 |
+18:28:58.2 |
HIP 48366 |
12.01 |
| 2026-05-19 00:00 |
09:50:57.55 |
+18:27:45.8 |
HIP 48366 |
9.86 |
| 2026-05-19 12:00 |
09:51:05.59 |
+18:26:32.3 |
HIP 48366 |
7.69 |
| 2026-05-20 00:00 |
09:51:13.84 |
+18:25:17.8 |
HIP 48366 |
5.54 |
| 2026-05-20 12:00 |
09:51:22.31 |
+18:24:02.3 |
HIP 48366 |
3.55 |
| 2026-05-21 00:00 |
09:51:31.00 |
+18:22:45.8 |
HIP 48366 |
2.39 |
| 2026-05-21 12:00 |
09:51:39.90 |
+18:21:28.3 |
HIP 48366 |
3.28 |
| 2026-05-22 00:00 |
09:51:49.01 |
+18:20:09.8 |
HIP 48366 |
5.33 |
| 2026-05-22 12:00 |
09:51:58.33 |
+18:18:50.3 |
HIP 48366 |
7.72 |
| 2026-05-23 00:00 |
09:52:07.86 |
+18:17:29.9 |
HIP 48366 |
10.25 |
| 2026-05-23 12:00 |
09:52:17.60 |
+18:16:08.4 |
HIP 48366 |
12.86 |
| 2026-05-24 00:00 |
09:52:27.55 |
+18:14:46.1 |
HIP 48366 |
15.55 |
| 2026-05-24 12:00 |
09:52:37.70 |
+18:13:22.7 |
HIP 48366 |
18.30 |
| 2026-05-25 00:00 |
09:52:48.06 |
+18:11:58.4 |
HIP 48366 |
21.11 |
| 2026-05-25 12:00 |
09:52:58.62 |
+18:10:33.2 |
HIP 48562 |
18.78 |
| 2026-05-26 00:00 |
09:53:09.38 |
+18:09:07.1 |
HIP 48562 |
16.44 |
| 2026-05-26 12:00 |
09:53:20.34 |
+18:07:40.0 |
HIP 48562 |
14.28 |
| 2026-05-27 00:00 |
09:53:31.50 |
+18:06:11.9 |
HIP 48562 |
12.42 |
| 2026-05-27 12:00 |
09:53:42.86 |
+18:04:43.0 |
HIP 48562 |
11.07 |
| 2026-05-28 00:00 |
09:53:54.41 |
+18:03:13.2 |
HIP 48562 |
10.47 |
| 2026-05-28 12:00 |
09:54:06.15 |
+18:01:42.4 |
HIP 48562 |
10.77 |
| 2026-05-29 00:00 |
09:54:18.09 |
+18:00:10.8 |
HIP 48562 |
11.96 |
| 2026-05-29 12:00 |
09:54:30.22 |
+17:58:38.2 |
HIP 48562 |
13.84 |
| 2026-05-30 00:00 |
09:54:42.55 |
+17:57:04.8 |
HIP 48562 |
16.20 |
| 2026-05-30 12:00 |
09:54:55.06 |
+17:55:30.5 |
HIP 48562 |
18.89 |
| 2026-05-31 00:00 |
09:55:07.76 |
+17:53:55.3 |
HIP 48562 |
21.80 |
| 2026-05-31 12:00 |
09:55:20.64 |
+17:52:19.2 |
HIP 48700 |
21.54 |
| 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 |