メタデータ
| 項目 |
値 |
| Designation |
C/1998 M6 (Montani) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-10-06T09:36:58.354560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-08-01.0000000 |
| e |
0.99887950 |
| q (au) |
5.978630 |
| a (au) |
5335.660755 |
| i (deg) |
91.539988 |
| Ω (om, deg) |
306.603673 |
| ω (w, deg) |
9.130637 |
| M (ma, deg) |
359.999832 |
等級
散乱 + 全体線形
$$
M_a = (5.338 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.338 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.865 |
| k |
0.988 |
| δ90 |
1.326 |
| 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 |
09:22:42.24 |
+49:45:38.2 |
HIP 45974 |
13.05 |
| 2026-06-01 12:00 |
09:22:43.51 |
+49:45:12.2 |
HIP 45974 |
12.65 |
| 2026-06-02 00:00 |
09:22:44.80 |
+49:44:46.3 |
HIP 45974 |
12.25 |
| 2026-06-02 12:00 |
09:22:46.12 |
+49:44:20.3 |
HIP 45974 |
11.86 |
| 2026-06-03 00:00 |
09:22:47.47 |
+49:43:54.4 |
HIP 45974 |
11.48 |
| 2026-06-03 12:00 |
09:22:48.85 |
+49:43:28.5 |
HIP 45974 |
11.11 |
| 2026-06-04 00:00 |
09:22:50.25 |
+49:43:02.5 |
HIP 45974 |
10.76 |
| 2026-06-04 12:00 |
09:22:51.69 |
+49:42:36.6 |
HIP 45974 |
10.41 |
| 2026-06-05 00:00 |
09:22:53.15 |
+49:42:10.7 |
HIP 45974 |
10.08 |
| 2026-06-05 12:00 |
09:22:54.63 |
+49:41:44.8 |
HIP 45974 |
9.76 |
| 2026-06-06 00:00 |
09:22:56.15 |
+49:41:18.9 |
HIP 45974 |
9.46 |
| 2026-06-06 12:00 |
09:22:57.69 |
+49:40:53.0 |
HIP 45974 |
9.17 |
| 2026-06-07 00:00 |
09:22:59.26 |
+49:40:27.2 |
HIP 45974 |
8.91 |
| 2026-06-07 12:00 |
09:23:00.85 |
+49:40:01.3 |
HIP 45974 |
8.68 |
| 2026-06-08 00:00 |
09:23:02.47 |
+49:39:35.5 |
HIP 45974 |
8.47 |
| 2026-06-08 12:00 |
09:23:04.12 |
+49:39:09.7 |
HIP 45974 |
8.28 |
| 2026-06-09 00:00 |
09:23:05.79 |
+49:38:43.9 |
HIP 45974 |
8.13 |
| 2026-06-09 12:00 |
09:23:07.49 |
+49:38:18.2 |
HIP 45974 |
8.01 |
| 2026-06-10 00:00 |
09:23:09.22 |
+49:37:52.5 |
HIP 45974 |
7.93 |
| 2026-06-10 12:00 |
09:23:10.97 |
+49:37:26.7 |
HIP 45974 |
7.88 |
| 2026-06-11 00:00 |
09:23:12.75 |
+49:37:01.1 |
HIP 45974 |
7.87 |
| 2026-06-11 12:00 |
09:23:14.55 |
+49:36:35.4 |
HIP 45974 |
7.89 |
| 2026-06-12 00:00 |
09:23:16.38 |
+49:36:09.8 |
HIP 45974 |
7.96 |
| 2026-06-12 12:00 |
09:23:18.24 |
+49:35:44.2 |
HIP 45974 |
8.06 |
| 2026-06-13 00:00 |
09:23:20.12 |
+49:35:18.7 |
HIP 45974 |
8.20 |
| 2026-06-13 12:00 |
09:23:22.02 |
+49:34:53.1 |
HIP 45974 |
8.37 |
| 2026-06-14 00:00 |
09:23:23.95 |
+49:34:27.7 |
HIP 45974 |
8.57 |
| 2026-06-14 12:00 |
09:23:25.90 |
+49:34:02.2 |
HIP 45974 |
8.81 |
| 2026-06-15 00:00 |
09:23:27.88 |
+49:33:36.8 |
HIP 45974 |
9.08 |
| 2026-06-15 12:00 |
09:23:29.89 |
+49:33:11.5 |
HIP 45974 |
9.37 |
| 2026-06-16 00:00 |
09:23:31.91 |
+49:32:46.1 |
HIP 45974 |
9.68 |
| 2026-06-16 12:00 |
09:23:33.97 |
+49:32:20.9 |
HIP 45974 |
10.02 |
| 2026-06-17 00:00 |
09:23:36.04 |
+49:31:55.6 |
HIP 45974 |
10.38 |
| 2026-06-17 12:00 |
09:23:38.14 |
+49:31:30.5 |
HIP 45974 |
10.76 |
| 2026-06-18 00:00 |
09:23:40.26 |
+49:31:05.3 |
HIP 45974 |
11.16 |
| 2026-06-18 12:00 |
09:23:42.41 |
+49:30:40.3 |
HIP 45974 |
11.57 |
| 2026-06-19 00:00 |
09:23:44.58 |
+49:30:15.2 |
HIP 45974 |
11.99 |
| 2026-06-19 12:00 |
09:23:46.77 |
+49:29:50.3 |
HIP 45974 |
12.43 |
| 2026-06-20 00:00 |
09:23:48.98 |
+49:29:25.3 |
HIP 45974 |
12.88 |
| 2026-06-20 12:00 |
09:23:51.22 |
+49:29:00.5 |
HIP 45974 |
13.34 |
| 2026-06-21 00:00 |
09:23:53.48 |
+49:28:35.7 |
HIP 45974 |
13.81 |
| 2026-06-21 12:00 |
09:23:55.76 |
+49:28:10.9 |
HIP 45974 |
14.29 |
| 2026-06-22 00:00 |
09:23:58.06 |
+49:27:46.3 |
HIP 45974 |
14.78 |