メタデータ
| 項目 |
値 |
| Designation |
C/1990 M1 (McNaught-Hughes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1991-02-27T15:48:11.756160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1990-12-12.0000000 |
| e |
1.00128966 |
| q (au) |
2.682264 |
| a (au) |
-2079.821712 |
| i (deg) |
132.774960 |
| Ω (om, deg) |
233.206314 |
| ω (w, deg) |
18.169676 |
| M (ma, deg) |
-0.000807 |
等級
散乱 + 全体線形
$$
M_a = (4.670 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.670 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:41:00.70 |
+24:39:37.8 |
HIP 17034 |
26.02 |
| 2026-09-20 12:00 |
03:40:59.55 |
+24:39:35.6 |
HIP 17034 |
25.76 |
| 2026-09-21 00:00 |
03:40:58.38 |
+24:39:33.3 |
HIP 17034 |
25.50 |
| 2026-09-21 12:00 |
03:40:57.20 |
+24:39:30.9 |
HIP 17034 |
25.24 |
| 2026-09-22 00:00 |
03:40:56.00 |
+24:39:28.5 |
HIP 17034 |
24.97 |
| 2026-09-22 12:00 |
03:40:54.78 |
+24:39:26.0 |
HIP 17034 |
24.70 |
| 2026-09-23 00:00 |
03:40:53.55 |
+24:39:23.5 |
HIP 17034 |
24.43 |
| 2026-09-23 12:00 |
03:40:52.30 |
+24:39:20.8 |
HIP 17034 |
24.15 |
| 2026-09-24 00:00 |
03:40:51.04 |
+24:39:18.2 |
HIP 17034 |
23.87 |
| 2026-09-24 12:00 |
03:40:49.76 |
+24:39:15.4 |
HIP 17034 |
23.59 |
| 2026-09-25 00:00 |
03:40:48.46 |
+24:39:12.6 |
HIP 17034 |
23.30 |
| 2026-09-25 12:00 |
03:40:47.15 |
+24:39:09.7 |
HIP 17034 |
23.01 |
| 2026-09-26 00:00 |
03:40:45.82 |
+24:39:06.8 |
HIP 17034 |
22.72 |
| 2026-09-26 12:00 |
03:40:44.48 |
+24:39:03.8 |
HIP 17034 |
22.43 |
| 2026-09-27 00:00 |
03:40:43.12 |
+24:39:00.7 |
HIP 17034 |
22.13 |
| 2026-09-27 12:00 |
03:40:41.74 |
+24:38:57.6 |
HIP 17034 |
21.83 |
| 2026-09-28 00:00 |
03:40:40.36 |
+24:38:54.4 |
HIP 17034 |
21.52 |
| 2026-09-28 12:00 |
03:40:38.95 |
+24:38:51.2 |
HIP 17034 |
21.22 |
| 2026-09-29 00:00 |
03:40:37.53 |
+24:38:47.9 |
HIP 17034 |
20.91 |
| 2026-09-29 12:00 |
03:40:36.10 |
+24:38:44.5 |
HIP 17034 |
20.60 |
| 2026-09-30 00:00 |
03:40:34.65 |
+24:38:41.1 |
HIP 17034 |
20.28 |
| 2026-09-30 12:00 |
03:40:33.18 |
+24:38:37.6 |
HIP 17034 |
19.96 |
| 2026-10-01 00:00 |
03:40:31.71 |
+24:38:34.0 |
HIP 17034 |
19.64 |
| 2026-10-01 12:00 |
03:40:30.21 |
+24:38:30.4 |
HIP 17034 |
19.32 |
| 2026-10-02 00:00 |
03:40:28.71 |
+24:38:26.7 |
HIP 17034 |
19.00 |
| 2026-10-02 12:00 |
03:40:27.18 |
+24:38:23.0 |
HIP 17034 |
18.67 |
| 2026-10-03 00:00 |
03:40:25.65 |
+24:38:19.2 |
HIP 17034 |
18.34 |
| 2026-10-03 12:00 |
03:40:24.10 |
+24:38:15.3 |
HIP 17034 |
18.01 |
| 2026-10-04 00:00 |
03:40:22.53 |
+24:38:11.4 |
HIP 17034 |
17.68 |
| 2026-10-04 12:00 |
03:40:20.95 |
+24:38:07.4 |
HIP 17034 |
17.35 |
| 2026-10-05 00:00 |
03:40:19.36 |
+24:38:03.3 |
HIP 17034 |
17.01 |
| 2026-10-05 12:00 |
03:40:17.75 |
+24:37:59.2 |
HIP 17034 |
16.67 |
| 2026-10-06 00:00 |
03:40:16.13 |
+24:37:55.0 |
HIP 17034 |
16.34 |
| 2026-10-06 12:00 |
03:40:14.49 |
+24:37:50.8 |
HIP 17034 |
16.00 |
| 2026-10-07 00:00 |
03:40:12.85 |
+24:37:46.5 |
HIP 17034 |
15.66 |
| 2026-10-07 12:00 |
03:40:11.18 |
+24:37:42.1 |
HIP 17034 |
15.32 |
| 2026-10-08 00:00 |
03:40:09.51 |
+24:37:37.7 |
HIP 17034 |
14.98 |
| 2026-10-08 12:00 |
03:40:07.82 |
+24:37:33.2 |
HIP 17034 |
14.63 |
| 2026-10-09 00:00 |
03:40:06.12 |
+24:37:28.7 |
HIP 17034 |
14.29 |
| 2026-10-09 12:00 |
03:40:04.41 |
+24:37:24.1 |
HIP 17034 |
13.95 |
| 2026-10-10 00:00 |
03:40:02.68 |
+24:37:19.4 |
HIP 17034 |
13.61 |
| 2026-10-10 12:00 |
03:40:00.94 |
+24:37:14.7 |
HIP 17034 |
13.27 |
| 2026-10-11 00:00 |
03:39:59.19 |
+24:37:10.0 |
HIP 17034 |
12.93 |