メタデータ
| 項目 |
値 |
| Designation |
C/1997 G2 (Montani) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-04-16T07:14:20.978880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
13.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1997-07-26.0000000 |
| e |
0.99416325 |
| q (au) |
3.084963 |
| a (au) |
528.541310 |
| i (deg) |
69.835498 |
| Ω (om, deg) |
55.802519 |
| ω (w, deg) |
239.843035 |
| M (ma, deg) |
359.978562 |
等級
散乱 + 全体線形
$$
M_a = (4.554 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.554 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-03-26 00:00 |
03:48:51.09 |
+49:57:20.4 |
HIP 17713 |
27.14 |
| 2026-03-26 12:00 |
03:48:53.25 |
+49:57:11.2 |
HIP 17713 |
27.43 |
| 2026-03-27 00:00 |
03:48:55.44 |
+49:57:02.2 |
HIP 17713 |
27.72 |
| 2026-03-27 12:00 |
03:48:57.65 |
+49:56:53.4 |
HIP 18061 |
27.56 |
| 2026-03-28 00:00 |
03:48:59.88 |
+49:56:44.7 |
HIP 18061 |
27.18 |
| 2026-03-28 12:00 |
03:49:02.14 |
+49:56:36.1 |
HIP 18061 |
26.79 |
| 2026-03-29 00:00 |
03:49:04.42 |
+49:56:27.6 |
HIP 18061 |
26.39 |
| 2026-03-29 12:00 |
03:49:06.73 |
+49:56:19.4 |
HIP 18061 |
26.00 |
| 2026-03-30 00:00 |
03:49:09.06 |
+49:56:11.2 |
HIP 18061 |
25.60 |
| 2026-03-30 12:00 |
03:49:11.41 |
+49:56:03.2 |
HIP 18061 |
25.20 |
| 2026-03-31 00:00 |
03:49:13.79 |
+49:55:55.3 |
HIP 18061 |
24.79 |
| 2026-03-31 12:00 |
03:49:16.19 |
+49:55:47.6 |
HIP 18061 |
24.39 |
| 2026-04-01 00:00 |
03:49:18.61 |
+49:55:40.1 |
HIP 18061 |
23.98 |
| 2026-04-01 12:00 |
03:49:21.06 |
+49:55:32.6 |
HIP 18061 |
23.56 |
| 2026-04-02 00:00 |
03:49:23.52 |
+49:55:25.4 |
HIP 18061 |
23.15 |
| 2026-04-02 12:00 |
03:49:26.01 |
+49:55:18.2 |
HIP 18061 |
22.73 |
| 2026-04-03 00:00 |
03:49:28.53 |
+49:55:11.3 |
HIP 18061 |
22.31 |
| 2026-04-03 12:00 |
03:49:31.06 |
+49:55:04.4 |
HIP 18061 |
21.89 |
| 2026-04-04 00:00 |
03:49:33.62 |
+49:54:57.7 |
HIP 18061 |
21.47 |
| 2026-04-04 12:00 |
03:49:36.19 |
+49:54:51.2 |
HIP 18061 |
21.04 |
| 2026-04-05 00:00 |
03:49:38.79 |
+49:54:44.8 |
HIP 18061 |
20.61 |
| 2026-04-05 12:00 |
03:49:41.41 |
+49:54:38.6 |
HIP 18061 |
20.18 |
| 2026-04-06 00:00 |
03:49:44.05 |
+49:54:32.5 |
HIP 18061 |
19.75 |
| 2026-04-06 12:00 |
03:49:46.72 |
+49:54:26.6 |
HIP 18061 |
19.32 |
| 2026-04-07 00:00 |
03:49:49.40 |
+49:54:20.8 |
HIP 18061 |
18.88 |
| 2026-04-07 12:00 |
03:49:52.10 |
+49:54:15.1 |
HIP 18061 |
18.44 |
| 2026-04-08 00:00 |
03:49:54.83 |
+49:54:09.6 |
HIP 18061 |
18.00 |
| 2026-04-08 12:00 |
03:49:57.57 |
+49:54:04.3 |
HIP 18061 |
17.56 |
| 2026-04-09 00:00 |
03:50:00.33 |
+49:53:59.1 |
HIP 18061 |
17.12 |
| 2026-04-09 12:00 |
03:50:03.12 |
+49:53:54.1 |
HIP 18061 |
16.68 |
| 2026-04-10 00:00 |
03:50:05.92 |
+49:53:49.2 |
HIP 18061 |
16.23 |
| 2026-04-10 12:00 |
03:50:08.74 |
+49:53:44.5 |
HIP 18061 |
15.78 |
| 2026-04-11 00:00 |
03:50:11.58 |
+49:53:39.9 |
HIP 18061 |
15.34 |
| 2026-04-11 12:00 |
03:50:14.45 |
+49:53:35.5 |
HIP 18061 |
14.89 |
| 2026-04-12 00:00 |
03:50:17.32 |
+49:53:31.2 |
HIP 18061 |
14.44 |
| 2026-04-12 12:00 |
03:50:20.22 |
+49:53:27.1 |
HIP 18061 |
13.99 |
| 2026-04-13 00:00 |
03:50:23.14 |
+49:53:23.2 |
HIP 18061 |
13.55 |
| 2026-04-13 12:00 |
03:50:26.07 |
+49:53:19.4 |
HIP 18061 |
13.10 |
| 2026-04-14 00:00 |
03:50:29.03 |
+49:53:15.7 |
HIP 18061 |
12.65 |
| 2026-04-14 12:00 |
03:50:32.00 |
+49:53:12.2 |
HIP 18061 |
12.21 |
| 2026-04-15 00:00 |
03:50:34.98 |
+49:53:08.9 |
HIP 18061 |
11.76 |
| 2026-04-15 12:00 |
03:50:37.99 |
+49:53:05.7 |
HIP 18061 |
11.32 |
| 2026-04-16 00:00 |
03:50:41.01 |
+49:53:02.7 |
HIP 18061 |
10.89 |