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 · 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) |
| 2026-03-26 00:00 |
10:18:10.78 |
+16:46:33.3 |
HIP 50549 |
21.62 |
| 2026-03-26 12:00 |
10:18:05.54 |
+16:46:50.5 |
HIP 50549 |
22.59 |
| 2026-03-27 00:00 |
10:18:00.34 |
+16:47:07.4 |
HIP 50378 |
22.42 |
| 2026-03-27 12:00 |
10:17:55.17 |
+16:47:24.1 |
HIP 50378 |
22.06 |
| 2026-03-28 00:00 |
10:17:50.04 |
+16:47:40.5 |
HIP 50378 |
21.77 |
| 2026-03-28 12:00 |
10:17:44.95 |
+16:47:56.6 |
HIP 50378 |
21.54 |
| 2026-03-29 00:00 |
10:17:39.89 |
+16:48:12.4 |
HIP 50378 |
21.39 |
| 2026-03-29 12:00 |
10:17:34.86 |
+16:48:28.0 |
HIP 50378 |
21.30 |
| 2026-03-30 00:00 |
10:17:29.88 |
+16:48:43.2 |
HIP 50378 |
21.28 |
| 2026-03-30 12:00 |
10:17:24.93 |
+16:48:58.2 |
HIP 50378 |
21.33 |
| 2026-03-31 00:00 |
10:17:20.02 |
+16:49:13.0 |
HIP 50378 |
21.44 |
| 2026-03-31 12:00 |
10:17:15.15 |
+16:49:27.4 |
HIP 50378 |
21.61 |
| 2026-04-01 00:00 |
10:17:10.31 |
+16:49:41.5 |
HIP 50378 |
21.85 |
| 2026-04-01 12:00 |
10:17:05.52 |
+16:49:55.4 |
HIP 50378 |
22.13 |
| 2026-04-02 00:00 |
10:17:00.77 |
+16:50:09.0 |
HIP 50378 |
22.47 |
| 2026-04-02 12:00 |
10:16:56.05 |
+16:50:22.3 |
HIP 50378 |
22.86 |
| 2026-04-03 00:00 |
10:16:51.38 |
+16:50:35.3 |
HIP 50378 |
23.29 |
| 2026-04-03 12:00 |
10:16:46.74 |
+16:50:48.0 |
HIP 50229 |
22.53 |
| 2026-04-04 00:00 |
10:16:42.15 |
+16:51:00.5 |
HIP 50229 |
21.43 |
| 2026-04-04 12:00 |
10:16:37.59 |
+16:51:12.6 |
HIP 50229 |
20.33 |
| 2026-04-05 00:00 |
10:16:33.08 |
+16:51:24.5 |
HIP 50229 |
19.25 |
| 2026-04-05 12:00 |
10:16:28.61 |
+16:51:36.0 |
HIP 50229 |
18.18 |
| 2026-04-06 00:00 |
10:16:24.19 |
+16:51:47.3 |
HIP 50229 |
17.12 |
| 2026-04-06 12:00 |
10:16:19.80 |
+16:51:58.3 |
HIP 50229 |
16.08 |
| 2026-04-07 00:00 |
10:16:15.46 |
+16:52:09.0 |
HIP 50229 |
15.04 |
| 2026-04-07 12:00 |
10:16:11.16 |
+16:52:19.4 |
HIP 50229 |
14.02 |
| 2026-04-08 00:00 |
10:16:06.90 |
+16:52:29.5 |
HIP 50229 |
13.02 |
| 2026-04-08 12:00 |
10:16:02.69 |
+16:52:39.3 |
HIP 50229 |
12.02 |
| 2026-04-09 00:00 |
10:15:58.52 |
+16:52:48.8 |
HIP 50229 |
11.05 |
| 2026-04-09 12:00 |
10:15:54.40 |
+16:52:58.0 |
HIP 50229 |
10.09 |
| 2026-04-10 00:00 |
10:15:50.32 |
+16:53:06.9 |
HIP 50229 |
9.15 |
| 2026-04-10 12:00 |
10:15:46.28 |
+16:53:15.5 |
HIP 50229 |
8.22 |
| 2026-04-11 00:00 |
10:15:42.29 |
+16:53:23.8 |
HIP 50229 |
7.33 |
| 2026-04-11 12:00 |
10:15:38.35 |
+16:53:31.8 |
HIP 50229 |
6.45 |
| 2026-04-12 00:00 |
10:15:34.45 |
+16:53:39.5 |
HIP 50229 |
5.62 |
| 2026-04-12 12:00 |
10:15:30.60 |
+16:53:46.9 |
HIP 50229 |
4.83 |
| 2026-04-13 00:00 |
10:15:26.79 |
+16:53:54.0 |
HIP 50229 |
4.11 |
| 2026-04-13 12:00 |
10:15:23.03 |
+16:54:00.8 |
HIP 50229 |
3.48 |
| 2026-04-14 00:00 |
10:15:19.32 |
+16:54:07.3 |
HIP 50229 |
3.00 |
| 2026-04-14 12:00 |
10:15:15.65 |
+16:54:13.5 |
HIP 50229 |
2.74 |
| 2026-04-15 00:00 |
10:15:12.03 |
+16:54:19.4 |
HIP 50229 |
2.75 |
| 2026-04-15 12:00 |
10:15:08.46 |
+16:54:25.0 |
HIP 50229 |
3.00 |
| 2026-04-16 00:00 |
10:15:04.94 |
+16:54:30.2 |
HIP 50229 |
3.45 |