C/1997 G2 (Montani)
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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1997-04-12 |
1998-03-31 |
+3.1326 |
-1.759 |
| 1998-04-20 |
1998-10-09 |
-27.6843 |
+13.470 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
03:47:45.84 |
+50:22:33.2 |
HIP 17713 |
1.42 |
| 2026-02-03 12:00 |
03:47:44.85 |
+50:22:14.8 |
HIP 17713 |
1.14 |
| 2026-02-04 00:00 |
03:47:43.89 |
+50:21:56.4 |
HIP 17713 |
0.92 |
| 2026-02-04 12:00 |
03:47:42.96 |
+50:21:38.1 |
HIP 17713 |
0.79 |
| 2026-02-05 00:00 |
03:47:42.07 |
+50:21:19.8 |
HIP 17713 |
0.80 |
| 2026-02-05 12:00 |
03:47:41.21 |
+50:21:01.5 |
HIP 17713 |
0.95 |
| 2026-02-06 00:00 |
03:47:40.38 |
+50:20:43.2 |
HIP 17713 |
1.17 |
| 2026-02-06 12:00 |
03:47:39.59 |
+50:20:25.0 |
HIP 17713 |
1.44 |
| 2026-02-07 00:00 |
03:47:38.83 |
+50:20:06.8 |
HIP 17713 |
1.73 |
| 2026-02-07 12:00 |
03:47:38.10 |
+50:19:48.7 |
HIP 17713 |
2.03 |
| 2026-02-08 00:00 |
03:47:37.41 |
+50:19:30.5 |
HIP 17713 |
2.33 |
| 2026-02-08 12:00 |
03:47:36.75 |
+50:19:12.4 |
HIP 17713 |
2.64 |
| 2026-02-09 00:00 |
03:47:36.12 |
+50:18:54.4 |
HIP 17713 |
2.95 |
| 2026-02-09 12:00 |
03:47:35.52 |
+50:18:36.4 |
HIP 17713 |
3.26 |
| 2026-02-10 00:00 |
03:47:34.96 |
+50:18:18.4 |
HIP 17713 |
3.57 |
| 2026-02-10 12:00 |
03:47:34.44 |
+50:18:00.5 |
HIP 17713 |
3.88 |
| 2026-02-11 00:00 |
03:47:33.94 |
+50:17:42.6 |
HIP 17713 |
4.18 |
| 2026-02-11 12:00 |
03:47:33.48 |
+50:17:24.8 |
HIP 17713 |
4.49 |
| 2026-02-12 00:00 |
03:47:33.05 |
+50:17:07.0 |
HIP 17713 |
4.79 |
| 2026-02-12 12:00 |
03:47:32.66 |
+50:16:49.3 |
HIP 17713 |
5.09 |
| 2026-02-13 00:00 |
03:47:32.30 |
+50:16:31.6 |
HIP 17713 |
5.39 |
| 2026-02-13 12:00 |
03:47:31.97 |
+50:16:13.9 |
HIP 17713 |
5.69 |
| 2026-02-14 00:00 |
03:47:31.68 |
+50:15:56.4 |
HIP 17713 |
5.99 |
| 2026-02-14 12:00 |
03:47:31.42 |
+50:15:38.8 |
HIP 17713 |
6.28 |
| 2026-02-15 00:00 |
03:47:31.20 |
+50:15:21.4 |
HIP 17713 |
6.58 |
| 2026-02-15 12:00 |
03:47:31.00 |
+50:15:04.0 |
HIP 17713 |
6.87 |
| 2026-02-16 00:00 |
03:47:30.84 |
+50:14:46.6 |
HIP 17713 |
7.16 |
| 2026-02-16 12:00 |
03:47:30.72 |
+50:14:29.3 |
HIP 17713 |
7.45 |
| 2026-02-17 00:00 |
03:47:30.62 |
+50:14:12.1 |
HIP 17713 |
7.73 |
| 2026-02-17 12:00 |
03:47:30.57 |
+50:13:54.9 |
HIP 17713 |
8.01 |
| 2026-02-18 00:00 |
03:47:30.54 |
+50:13:37.8 |
HIP 17713 |
8.30 |
| 2026-02-18 12:00 |
03:47:30.55 |
+50:13:20.8 |
HIP 17713 |
8.58 |
| 2026-02-19 00:00 |
03:47:30.59 |
+50:13:03.9 |
HIP 17713 |
8.86 |
| 2026-02-19 12:00 |
03:47:30.66 |
+50:12:47.0 |
HIP 17713 |
9.13 |
| 2026-02-20 00:00 |
03:47:30.77 |
+50:12:30.2 |
HIP 17713 |
9.41 |
| 2026-02-20 12:00 |
03:47:30.91 |
+50:12:13.4 |
HIP 17713 |
9.68 |
| 2026-02-21 00:00 |
03:47:31.09 |
+50:11:56.8 |
HIP 17713 |
9.96 |
| 2026-02-21 12:00 |
03:47:31.29 |
+50:11:40.2 |
HIP 17713 |
10.23 |
| 2026-02-22 00:00 |
03:47:31.53 |
+50:11:23.7 |
HIP 17713 |
10.50 |
| 2026-02-22 12:00 |
03:47:31.80 |
+50:11:07.2 |
HIP 17713 |
10.77 |
| 2026-02-23 00:00 |
03:47:32.11 |
+50:10:50.9 |
HIP 17713 |
11.03 |
| 2026-02-23 12:00 |
03:47:32.45 |
+50:10:34.6 |
HIP 17713 |
11.30 |
| 2026-02-24 00:00 |
03:47:32.82 |
+50:10:18.4 |
HIP 17713 |
11.56 |