メタデータ
| 項目 |
値 |
| Designation |
C/2018 M1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-07-10T00:35:11.529600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:44Z |
| Obs used |
171 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
5.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-06-25T10:26:00.672000Z |
| Discovery magnitude (MPC) |
17.60 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-08-16.0000000 |
| e |
0.93870003 |
| q (au) |
1.303480 |
| a (au) |
21.263951 |
| i (deg) |
37.257024 |
| Ω (om, deg) |
339.463309 |
| ω (w, deg) |
14.132786 |
| M (ma, deg) |
0.371666 |
等級
散乱 + 全体線形
$$
M_a = (16.433 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.433 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.965 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
10:13:21.53 |
+16:41:25.3 |
HIP 50040 |
10.88 |
| 2026-06-01 12:00 |
10:13:22.82 |
+16:41:04.0 |
HIP 50040 |
10.73 |
| 2026-06-02 00:00 |
10:13:24.15 |
+16:40:42.5 |
HIP 50040 |
10.60 |
| 2026-06-02 12:00 |
10:13:25.53 |
+16:40:20.8 |
HIP 50040 |
10.49 |
| 2026-06-03 00:00 |
10:13:26.96 |
+16:39:58.8 |
HIP 50040 |
10.42 |
| 2026-06-03 12:00 |
10:13:28.44 |
+16:39:36.6 |
HIP 50040 |
10.37 |
| 2026-06-04 00:00 |
10:13:29.97 |
+16:39:14.1 |
HIP 50040 |
10.35 |
| 2026-06-04 12:00 |
10:13:31.55 |
+16:38:51.5 |
HIP 50040 |
10.36 |
| 2026-06-05 00:00 |
10:13:33.17 |
+16:38:28.5 |
HIP 50040 |
10.41 |
| 2026-06-05 12:00 |
10:13:34.84 |
+16:38:05.4 |
HIP 50040 |
10.49 |
| 2026-06-06 00:00 |
10:13:36.56 |
+16:37:42.0 |
HIP 50040 |
10.61 |
| 2026-06-06 12:00 |
10:13:38.33 |
+16:37:18.4 |
HIP 50040 |
10.76 |
| 2026-06-07 00:00 |
10:13:40.15 |
+16:36:54.6 |
HIP 50040 |
10.95 |
| 2026-06-07 12:00 |
10:13:42.01 |
+16:36:30.6 |
HIP 50040 |
11.18 |
| 2026-06-08 00:00 |
10:13:43.92 |
+16:36:06.3 |
HIP 50040 |
11.45 |
| 2026-06-08 12:00 |
10:13:45.87 |
+16:35:41.8 |
HIP 50040 |
11.75 |
| 2026-06-09 00:00 |
10:13:47.88 |
+16:35:17.1 |
HIP 50040 |
12.08 |
| 2026-06-09 12:00 |
10:13:49.92 |
+16:34:52.2 |
HIP 50040 |
12.45 |
| 2026-06-10 00:00 |
10:13:52.02 |
+16:34:27.0 |
HIP 50040 |
12.85 |
| 2026-06-10 12:00 |
10:13:54.16 |
+16:34:01.6 |
HIP 50040 |
13.28 |
| 2026-06-11 00:00 |
10:13:56.35 |
+16:33:36.0 |
HIP 50040 |
13.74 |
| 2026-06-11 12:00 |
10:13:58.59 |
+16:33:10.2 |
HIP 50040 |
14.22 |
| 2026-06-12 00:00 |
10:14:00.87 |
+16:32:44.2 |
HIP 50040 |
14.74 |
| 2026-06-12 12:00 |
10:14:03.19 |
+16:32:18.0 |
HIP 50040 |
15.28 |
| 2026-06-13 00:00 |
10:14:05.56 |
+16:31:51.5 |
HIP 50040 |
15.84 |
| 2026-06-13 12:00 |
10:14:07.98 |
+16:31:24.9 |
HIP 50040 |
16.43 |
| 2026-06-14 00:00 |
10:14:10.44 |
+16:30:58.0 |
HIP 50040 |
17.04 |
| 2026-06-14 12:00 |
10:14:12.94 |
+16:30:31.0 |
HIP 50040 |
17.67 |
| 2026-06-15 00:00 |
10:14:15.49 |
+16:30:03.7 |
HIP 50040 |
18.32 |
| 2026-06-15 12:00 |
10:14:18.09 |
+16:29:36.2 |
HIP 50040 |
18.99 |
| 2026-06-16 00:00 |
10:14:20.73 |
+16:29:08.6 |
HIP 50040 |
19.67 |
| 2026-06-16 12:00 |
10:14:23.41 |
+16:28:40.7 |
HIP 50040 |
20.38 |
| 2026-06-17 00:00 |
10:14:26.13 |
+16:28:12.6 |
HIP 50175 |
19.95 |
| 2026-06-17 12:00 |
10:14:28.90 |
+16:27:44.3 |
HIP 50175 |
19.45 |
| 2026-06-18 00:00 |
10:14:31.71 |
+16:27:15.9 |
HIP 50175 |
18.96 |
| 2026-06-18 12:00 |
10:14:34.57 |
+16:26:47.2 |
HIP 50175 |
18.50 |
| 2026-06-19 00:00 |
10:14:37.47 |
+16:26:18.4 |
HIP 50175 |
18.06 |
| 2026-06-19 12:00 |
10:14:40.40 |
+16:25:49.4 |
HIP 50175 |
17.64 |
| 2026-06-20 00:00 |
10:14:43.39 |
+16:25:20.1 |
HIP 50175 |
17.26 |
| 2026-06-20 12:00 |
10:14:46.41 |
+16:24:50.7 |
HIP 50175 |
16.91 |
| 2026-06-21 00:00 |
10:14:49.47 |
+16:24:21.2 |
HIP 50175 |
16.60 |
| 2026-06-21 12:00 |
10:14:52.58 |
+16:23:51.4 |
HIP 50175 |
16.34 |
| 2026-06-22 00:00 |
10:14:55.72 |
+16:23:21.4 |
HIP 50175 |
16.11 |