メタデータ
| 項目 |
値 |
| Designation |
C/2000 A1 (Montani) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-07-13T05:54:09.682560Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:30Z |
| Obs used |
135 |
| NEO |
- |
| M1 |
4.400 |
| 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) |
2000-07-31.0000000 |
| e |
1.00401459 |
| q (au) |
9.743100 |
| a (au) |
-2426.925294 |
| i (deg) |
24.541886 |
| Ω (om, deg) |
111.835138 |
| ω (w, deg) |
14.271337 |
| M (ma, deg) |
0.000146 |
等級
散乱 + 全体線形
$$
M_a = (8.448 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.448 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.505 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-05-12 00:00 |
16:49:01.75 |
-05:17:04.1 |
HIP 82301 |
17.97 |
| 2026-05-12 12:00 |
16:48:59.39 |
-05:16:56.5 |
HIP 82301 |
17.83 |
| 2026-05-13 00:00 |
16:48:57.01 |
-05:16:49.0 |
HIP 82301 |
17.71 |
| 2026-05-13 12:00 |
16:48:54.62 |
-05:16:41.6 |
HIP 82301 |
17.61 |
| 2026-05-14 00:00 |
16:48:52.23 |
-05:16:34.3 |
HIP 82301 |
17.53 |
| 2026-05-14 12:00 |
16:48:49.83 |
-05:16:27.1 |
HIP 82301 |
17.48 |
| 2026-05-15 00:00 |
16:48:47.42 |
-05:16:19.9 |
HIP 82301 |
17.45 |
| 2026-05-15 12:00 |
16:48:45.00 |
-05:16:12.9 |
HIP 82301 |
17.44 |
| 2026-05-16 00:00 |
16:48:42.57 |
-05:16:05.9 |
HIP 82301 |
17.45 |
| 2026-05-16 12:00 |
16:48:40.13 |
-05:15:59.0 |
HIP 82301 |
17.49 |
| 2026-05-17 00:00 |
16:48:37.69 |
-05:15:52.2 |
HIP 82301 |
17.55 |
| 2026-05-17 12:00 |
16:48:35.24 |
-05:15:45.5 |
HIP 82301 |
17.64 |
| 2026-05-18 00:00 |
16:48:32.78 |
-05:15:38.9 |
HIP 82301 |
17.75 |
| 2026-05-18 12:00 |
16:48:30.31 |
-05:15:32.4 |
HIP 82301 |
17.88 |
| 2026-05-19 00:00 |
16:48:27.84 |
-05:15:26.0 |
HIP 82301 |
18.03 |
| 2026-05-19 12:00 |
16:48:25.36 |
-05:15:19.6 |
HIP 82301 |
18.21 |
| 2026-05-20 00:00 |
16:48:22.87 |
-05:15:13.4 |
HIP 82301 |
18.41 |
| 2026-05-20 12:00 |
16:48:20.38 |
-05:15:07.2 |
HIP 82301 |
18.63 |
| 2026-05-21 00:00 |
16:48:17.88 |
-05:15:01.2 |
HIP 82301 |
18.87 |
| 2026-05-21 12:00 |
16:48:15.38 |
-05:14:55.2 |
HIP 82301 |
19.13 |
| 2026-05-22 00:00 |
16:48:12.87 |
-05:14:49.4 |
HIP 82301 |
19.41 |
| 2026-05-22 12:00 |
16:48:10.36 |
-05:14:43.6 |
HIP 82301 |
19.71 |
| 2026-05-23 00:00 |
16:48:07.84 |
-05:14:37.9 |
HIP 82301 |
20.02 |
| 2026-05-23 12:00 |
16:48:05.31 |
-05:14:32.4 |
HIP 82301 |
20.36 |
| 2026-05-24 00:00 |
16:48:02.78 |
-05:14:26.9 |
HIP 82301 |
20.70 |
| 2026-05-24 12:00 |
16:48:00.25 |
-05:14:21.5 |
HIP 82301 |
21.07 |
| 2026-05-25 00:00 |
16:47:57.71 |
-05:14:16.2 |
HIP 82301 |
21.45 |
| 2026-05-25 12:00 |
16:47:55.17 |
-05:14:11.0 |
HIP 82301 |
21.84 |
| 2026-05-26 00:00 |
16:47:52.62 |
-05:14:06.0 |
HIP 82301 |
22.25 |
| 2026-05-26 12:00 |
16:47:50.08 |
-05:14:01.0 |
HIP 82301 |
22.66 |
| 2026-05-27 00:00 |
16:47:47.52 |
-05:13:56.1 |
HIP 82301 |
23.09 |
| 2026-05-27 12:00 |
16:47:44.97 |
-05:13:51.3 |
HIP 82301 |
23.54 |
| 2026-05-28 00:00 |
16:47:42.41 |
-05:13:46.6 |
HIP 82301 |
23.99 |
| 2026-05-28 12:00 |
16:47:39.85 |
-05:13:42.0 |
HIP 82301 |
24.45 |
| 2026-05-29 00:00 |
16:47:37.28 |
-05:13:37.6 |
HIP 82301 |
24.92 |
| 2026-05-29 12:00 |
16:47:34.72 |
-05:13:33.2 |
HIP 82301 |
25.40 |
| 2026-05-30 00:00 |
16:47:32.15 |
-05:13:28.9 |
HIP 82301 |
25.89 |
| 2026-05-30 12:00 |
16:47:29.58 |
-05:13:24.7 |
HIP 82301 |
26.39 |
| 2026-05-31 00:00 |
16:47:27.01 |
-05:13:20.7 |
HIP 82301 |
26.89 |
| 2026-05-31 12:00 |
16:47:24.43 |
-05:13:16.7 |
HIP 82301 |
27.40 |
| 2026-06-01 00:00 |
16:47:21.86 |
-05:13:12.8 |
HIP 82301 |
27.92 |
| 2026-06-01 12:00 |
16:47:19.28 |
-05:13:09.1 |
HIP 82301 |
28.45 |
| 2026-06-02 00:00 |
16:47:16.71 |
-05:13:05.4 |
HIP 82301 |
28.98 |