メタデータ
| 項目 |
値 |
| Designation |
C/2007 M1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-08-11T17:35:21.920640Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:21Z |
| Obs used |
232 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
9.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-10-11.0000000 |
| e |
0.99520236 |
| q (au) |
7.474661 |
| a (au) |
1557.985505 |
| i (deg) |
139.721499 |
| Ω (om, deg) |
326.808769 |
| ω (w, deg) |
52.635857 |
| M (ma, deg) |
0.000966 |
等級
散乱 + 全体線形
$$
M_a = (4.972 + 4.027\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.972 |
| n |
4.027 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
10:14:54.59 |
+13:36:08.2 |
HIP 50124 |
21.43 |
| 2026-09-20 12:00 |
10:14:57.19 |
+13:35:50.5 |
HIP 50124 |
22.07 |
| 2026-09-21 00:00 |
10:14:59.78 |
+13:35:33.0 |
HIP 50124 |
22.71 |
| 2026-09-21 12:00 |
10:15:02.36 |
+13:35:15.5 |
HIP 50124 |
23.35 |
| 2026-09-22 00:00 |
10:15:04.93 |
+13:34:58.1 |
HIP 50324 |
23.76 |
| 2026-09-22 12:00 |
10:15:07.48 |
+13:34:40.8 |
HIP 50324 |
23.08 |
| 2026-09-23 00:00 |
10:15:10.03 |
+13:34:23.6 |
HIP 50324 |
22.40 |
| 2026-09-23 12:00 |
10:15:12.55 |
+13:34:06.5 |
HIP 50324 |
21.73 |
| 2026-09-24 00:00 |
10:15:15.07 |
+13:33:49.5 |
HIP 50324 |
21.06 |
| 2026-09-24 12:00 |
10:15:17.57 |
+13:33:32.6 |
HIP 50324 |
20.39 |
| 2026-09-25 00:00 |
10:15:20.06 |
+13:33:15.7 |
HIP 50324 |
19.72 |
| 2026-09-25 12:00 |
10:15:22.53 |
+13:32:59.0 |
HIP 50324 |
19.06 |
| 2026-09-26 00:00 |
10:15:24.99 |
+13:32:42.3 |
HIP 50324 |
18.41 |
| 2026-09-26 12:00 |
10:15:27.44 |
+13:32:25.8 |
HIP 50324 |
17.75 |
| 2026-09-27 00:00 |
10:15:29.87 |
+13:32:09.3 |
HIP 50324 |
17.11 |
| 2026-09-27 12:00 |
10:15:32.28 |
+13:31:53.0 |
HIP 50324 |
16.46 |
| 2026-09-28 00:00 |
10:15:34.68 |
+13:31:36.7 |
HIP 50324 |
15.82 |
| 2026-09-28 12:00 |
10:15:37.07 |
+13:31:20.6 |
HIP 50324 |
15.19 |
| 2026-09-29 00:00 |
10:15:39.44 |
+13:31:04.5 |
HIP 50324 |
14.56 |
| 2026-09-29 12:00 |
10:15:41.79 |
+13:30:48.5 |
HIP 50324 |
13.93 |
| 2026-09-30 00:00 |
10:15:44.13 |
+13:30:32.7 |
HIP 50324 |
13.31 |
| 2026-09-30 12:00 |
10:15:46.45 |
+13:30:16.9 |
HIP 50324 |
12.69 |
| 2026-10-01 00:00 |
10:15:48.76 |
+13:30:01.3 |
HIP 50324 |
12.08 |
| 2026-10-01 12:00 |
10:15:51.05 |
+13:29:45.7 |
HIP 50324 |
11.47 |
| 2026-10-02 00:00 |
10:15:53.33 |
+13:29:30.3 |
HIP 50324 |
10.87 |
| 2026-10-02 12:00 |
10:15:55.58 |
+13:29:15.0 |
HIP 50324 |
10.27 |
| 2026-10-03 00:00 |
10:15:57.82 |
+13:28:59.8 |
HIP 50324 |
9.68 |
| 2026-10-03 12:00 |
10:16:00.05 |
+13:28:44.7 |
HIP 50324 |
9.09 |
| 2026-10-04 00:00 |
10:16:02.25 |
+13:28:29.7 |
HIP 50324 |
8.51 |
| 2026-10-04 12:00 |
10:16:04.44 |
+13:28:14.8 |
HIP 50324 |
7.93 |
| 2026-10-05 00:00 |
10:16:06.61 |
+13:28:00.0 |
HIP 50324 |
7.37 |
| 2026-10-05 12:00 |
10:16:08.77 |
+13:27:45.3 |
HIP 50324 |
6.80 |
| 2026-10-06 00:00 |
10:16:10.90 |
+13:27:30.8 |
HIP 50324 |
6.25 |
| 2026-10-06 12:00 |
10:16:13.02 |
+13:27:16.4 |
HIP 50324 |
5.71 |
| 2026-10-07 00:00 |
10:16:15.12 |
+13:27:02.1 |
HIP 50324 |
5.17 |
| 2026-10-07 12:00 |
10:16:17.20 |
+13:26:47.9 |
HIP 50324 |
4.65 |
| 2026-10-08 00:00 |
10:16:19.26 |
+13:26:33.8 |
HIP 50324 |
4.14 |
| 2026-10-08 12:00 |
10:16:21.30 |
+13:26:19.9 |
HIP 50324 |
3.65 |
| 2026-10-09 00:00 |
10:16:23.32 |
+13:26:06.0 |
HIP 50324 |
3.17 |
| 2026-10-09 12:00 |
10:16:25.32 |
+13:25:52.3 |
HIP 50324 |
2.74 |
| 2026-10-10 00:00 |
10:16:27.30 |
+13:25:38.8 |
HIP 50324 |
2.34 |
| 2026-10-10 12:00 |
10:16:29.27 |
+13:25:25.3 |
HIP 50324 |
2.02 |
| 2026-10-11 00:00 |
10:16:31.21 |
+13:25:12.0 |
HIP 50324 |
1.79 |