C/1990 M1 (McNaught-Hughes)
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 |
-0.997 |
| 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) |
| 2026-02-03 00:00 |
03:33:33.84 |
+24:21:03.9 |
HIP 16639 |
7.63 |
| 2026-02-03 12:00 |
03:33:33.33 |
+24:20:58.5 |
HIP 16639 |
7.74 |
| 2026-02-04 00:00 |
03:33:32.84 |
+24:20:53.2 |
HIP 16639 |
7.85 |
| 2026-02-04 12:00 |
03:33:32.38 |
+24:20:47.9 |
HIP 16639 |
7.95 |
| 2026-02-05 00:00 |
03:33:31.93 |
+24:20:42.7 |
HIP 16639 |
8.06 |
| 2026-02-05 12:00 |
03:33:31.50 |
+24:20:37.6 |
HIP 16639 |
8.15 |
| 2026-02-06 00:00 |
03:33:31.09 |
+24:20:32.5 |
HIP 16639 |
8.25 |
| 2026-02-06 12:00 |
03:33:30.70 |
+24:20:27.5 |
HIP 16639 |
8.34 |
| 2026-02-07 00:00 |
03:33:30.33 |
+24:20:22.5 |
HIP 16639 |
8.43 |
| 2026-02-07 12:00 |
03:33:29.97 |
+24:20:17.6 |
HIP 16639 |
8.51 |
| 2026-02-08 00:00 |
03:33:29.64 |
+24:20:12.8 |
HIP 16639 |
8.59 |
| 2026-02-08 12:00 |
03:33:29.33 |
+24:20:08.0 |
HIP 16639 |
8.67 |
| 2026-02-09 00:00 |
03:33:29.03 |
+24:20:03.3 |
HIP 16639 |
8.74 |
| 2026-02-09 12:00 |
03:33:28.76 |
+24:19:58.7 |
HIP 16639 |
8.81 |
| 2026-02-10 00:00 |
03:33:28.50 |
+24:19:54.1 |
HIP 16639 |
8.87 |
| 2026-02-10 12:00 |
03:33:28.27 |
+24:19:49.6 |
HIP 16639 |
8.93 |
| 2026-02-11 00:00 |
03:33:28.05 |
+24:19:45.2 |
HIP 16639 |
8.99 |
| 2026-02-11 12:00 |
03:33:27.85 |
+24:19:40.8 |
HIP 16639 |
9.04 |
| 2026-02-12 00:00 |
03:33:27.67 |
+24:19:36.4 |
HIP 16639 |
9.09 |
| 2026-02-12 12:00 |
03:33:27.51 |
+24:19:32.2 |
HIP 16639 |
9.13 |
| 2026-02-13 00:00 |
03:33:27.37 |
+24:19:28.0 |
HIP 16639 |
9.17 |
| 2026-02-13 12:00 |
03:33:27.25 |
+24:19:23.9 |
HIP 16639 |
9.21 |
| 2026-02-14 00:00 |
03:33:27.15 |
+24:19:19.8 |
HIP 16639 |
9.24 |
| 2026-02-14 12:00 |
03:33:27.07 |
+24:19:15.8 |
HIP 16639 |
9.27 |
| 2026-02-15 00:00 |
03:33:27.01 |
+24:19:11.9 |
HIP 16639 |
9.29 |
| 2026-02-15 12:00 |
03:33:26.97 |
+24:19:08.0 |
HIP 16639 |
9.31 |
| 2026-02-16 00:00 |
03:33:26.95 |
+24:19:04.2 |
HIP 16639 |
9.33 |
| 2026-02-16 12:00 |
03:33:26.94 |
+24:19:00.5 |
HIP 16639 |
9.34 |
| 2026-02-17 00:00 |
03:33:26.96 |
+24:18:56.8 |
HIP 16639 |
9.35 |
| 2026-02-17 12:00 |
03:33:26.99 |
+24:18:53.2 |
HIP 16639 |
9.35 |
| 2026-02-18 00:00 |
03:33:27.05 |
+24:18:49.7 |
HIP 16639 |
9.35 |
| 2026-02-18 12:00 |
03:33:27.12 |
+24:18:46.2 |
HIP 16639 |
9.35 |
| 2026-02-19 00:00 |
03:33:27.21 |
+24:18:42.8 |
HIP 16639 |
9.34 |
| 2026-02-19 12:00 |
03:33:27.33 |
+24:18:39.5 |
HIP 16639 |
9.33 |
| 2026-02-20 00:00 |
03:33:27.46 |
+24:18:36.2 |
HIP 16639 |
9.31 |
| 2026-02-20 12:00 |
03:33:27.61 |
+24:18:33.0 |
HIP 16639 |
9.29 |
| 2026-02-21 00:00 |
03:33:27.78 |
+24:18:29.9 |
HIP 16639 |
9.26 |
| 2026-02-21 12:00 |
03:33:27.97 |
+24:18:26.8 |
HIP 16639 |
9.23 |
| 2026-02-22 00:00 |
03:33:28.17 |
+24:18:23.8 |
HIP 16639 |
9.20 |
| 2026-02-22 12:00 |
03:33:28.40 |
+24:18:20.9 |
HIP 16639 |
9.16 |
| 2026-02-23 00:00 |
03:33:28.65 |
+24:18:18.1 |
HIP 16639 |
9.12 |
| 2026-02-23 12:00 |
03:33:28.91 |
+24:18:15.3 |
HIP 16639 |
9.07 |
| 2026-02-24 00:00 |
03:33:29.19 |
+24:18:12.5 |
HIP 16639 |
9.02 |