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) |
| 2026-07-29 00:00 |
09:27:35.63 |
+49:01:35.4 |
HIP 46441 |
11.24 |
| 2026-07-29 12:00 |
09:27:39.01 |
+49:01:18.7 |
HIP 46441 |
10.68 |
| 2026-07-30 00:00 |
09:27:42.39 |
+49:01:02.2 |
HIP 46441 |
10.12 |
| 2026-07-30 12:00 |
09:27:45.78 |
+49:00:45.8 |
HIP 46441 |
9.58 |
| 2026-07-31 00:00 |
09:27:49.18 |
+49:00:29.5 |
HIP 46441 |
9.04 |
| 2026-07-31 12:00 |
09:27:52.58 |
+49:00:13.5 |
HIP 46441 |
8.52 |
| 2026-08-01 00:00 |
09:27:55.99 |
+48:59:57.5 |
HIP 46441 |
8.01 |
| 2026-08-01 12:00 |
09:27:59.40 |
+48:59:41.7 |
HIP 46441 |
7.53 |
| 2026-08-02 00:00 |
09:28:02.82 |
+48:59:26.1 |
HIP 46441 |
7.06 |
| 2026-08-02 12:00 |
09:28:06.24 |
+48:59:10.6 |
HIP 46441 |
6.63 |
| 2026-08-03 00:00 |
09:28:09.67 |
+48:58:55.3 |
HIP 46441 |
6.22 |
| 2026-08-03 12:00 |
09:28:13.10 |
+48:58:40.1 |
HIP 46441 |
5.86 |
| 2026-08-04 00:00 |
09:28:16.54 |
+48:58:25.1 |
HIP 46441 |
5.54 |
| 2026-08-04 12:00 |
09:28:19.98 |
+48:58:10.3 |
HIP 46441 |
5.28 |
| 2026-08-05 00:00 |
09:28:23.42 |
+48:57:55.6 |
HIP 46441 |
5.09 |
| 2026-08-05 12:00 |
09:28:26.86 |
+48:57:41.0 |
HIP 46441 |
4.97 |
| 2026-08-06 00:00 |
09:28:30.31 |
+48:57:26.6 |
HIP 46441 |
4.92 |
| 2026-08-06 12:00 |
09:28:33.76 |
+48:57:12.4 |
HIP 46441 |
4.95 |
| 2026-08-07 00:00 |
09:28:37.22 |
+48:56:58.3 |
HIP 46441 |
5.06 |
| 2026-08-07 12:00 |
09:28:40.68 |
+48:56:44.4 |
HIP 46441 |
5.25 |
| 2026-08-08 00:00 |
09:28:44.14 |
+48:56:30.7 |
HIP 46441 |
5.49 |
| 2026-08-08 12:00 |
09:28:47.60 |
+48:56:17.1 |
HIP 46441 |
5.80 |
| 2026-08-09 00:00 |
09:28:51.06 |
+48:56:03.7 |
HIP 46441 |
6.15 |
| 2026-08-09 12:00 |
09:28:54.53 |
+48:55:50.4 |
HIP 46441 |
6.54 |
| 2026-08-10 00:00 |
09:28:57.99 |
+48:55:37.3 |
HIP 46441 |
6.97 |
| 2026-08-10 12:00 |
09:29:01.46 |
+48:55:24.4 |
HIP 46441 |
7.42 |
| 2026-08-11 00:00 |
09:29:04.93 |
+48:55:11.7 |
HIP 46441 |
7.89 |
| 2026-08-11 12:00 |
09:29:08.39 |
+48:54:59.1 |
HIP 46441 |
8.38 |
| 2026-08-12 00:00 |
09:29:11.86 |
+48:54:46.7 |
HIP 46441 |
8.89 |
| 2026-08-12 12:00 |
09:29:15.33 |
+48:54:34.4 |
HIP 46441 |
9.41 |
| 2026-08-13 00:00 |
09:29:18.80 |
+48:54:22.4 |
HIP 46441 |
9.94 |
| 2026-08-13 12:00 |
09:29:22.27 |
+48:54:10.5 |
HIP 46441 |
10.48 |
| 2026-08-14 00:00 |
09:29:25.74 |
+48:53:58.7 |
HIP 46441 |
11.02 |
| 2026-08-14 12:00 |
09:29:29.20 |
+48:53:47.2 |
HIP 46441 |
11.58 |
| 2026-08-15 00:00 |
09:29:32.67 |
+48:53:35.8 |
HIP 46441 |
12.13 |
| 2026-08-15 12:00 |
09:29:36.13 |
+48:53:24.6 |
HIP 46441 |
12.69 |
| 2026-08-16 00:00 |
09:29:39.59 |
+48:53:13.5 |
HIP 46441 |
13.25 |
| 2026-08-16 12:00 |
09:29:43.05 |
+48:53:02.7 |
HIP 46441 |
13.82 |
| 2026-08-17 00:00 |
09:29:46.51 |
+48:52:52.0 |
HIP 46441 |
14.39 |
| 2026-08-17 12:00 |
09:29:49.96 |
+48:52:41.5 |
HIP 46441 |
14.96 |
| 2026-08-18 00:00 |
09:29:53.42 |
+48:52:31.2 |
HIP 46441 |
15.53 |
| 2026-08-18 12:00 |
09:29:56.87 |
+48:52:21.0 |
HIP 46441 |
16.10 |
| 2026-08-19 00:00 |
09:30:00.31 |
+48:52:11.0 |
HIP 46441 |
16.67 |