メタデータ
| 項目 |
値 |
| Designation |
C/1997 J2 (Meunier-Dupouy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-03-10T10:24:04.697280Z |
| Orbit solution date (soln_date, UTC) |
2022-02-03T20:42:52Z |
| Obs used |
1420 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-01-22.0000000 |
| e |
1.00055829 |
| q (au) |
3.051149 |
| a (au) |
-5465.167454 |
| i (deg) |
91.273399 |
| Ω (om, deg) |
148.844533 |
| ω (w, deg) |
122.671679 |
| M (ma, deg) |
-0.000116 |
等級
散乱 + 全体線形
$$
M_a = (3.859 + 3.586\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.859 |
| n |
3.586 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 1997-05-07 |
1998-03-10 |
-1.5585 |
+0.533 |
| 1998-03-10 |
1999-10-09 |
+7.0916 |
-3.331 |
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) |
| 2026-07-29 00:00 |
06:42:28.84 |
-64:18:30.1 |
HIP 32011 |
8.47 |
| 2026-07-29 12:00 |
06:42:33.88 |
-64:18:44.8 |
HIP 32011 |
8.90 |
| 2026-07-30 00:00 |
06:42:38.91 |
-64:18:59.8 |
HIP 32011 |
9.35 |
| 2026-07-30 12:00 |
06:42:43.91 |
-64:19:15.0 |
HIP 32011 |
9.80 |
| 2026-07-31 00:00 |
06:42:48.90 |
-64:19:30.5 |
HIP 32011 |
10.27 |
| 2026-07-31 12:00 |
06:42:53.86 |
-64:19:46.3 |
HIP 32011 |
10.75 |
| 2026-08-01 00:00 |
06:42:58.81 |
-64:20:02.2 |
HIP 32011 |
11.24 |
| 2026-08-01 12:00 |
06:43:03.73 |
-64:20:18.5 |
HIP 32011 |
11.73 |
| 2026-08-02 00:00 |
06:43:08.64 |
-64:20:35.0 |
HIP 32011 |
12.24 |
| 2026-08-02 12:00 |
06:43:13.52 |
-64:20:51.7 |
HIP 32011 |
12.74 |
| 2026-08-03 00:00 |
06:43:18.38 |
-64:21:08.7 |
HIP 32079 |
12.83 |
| 2026-08-03 12:00 |
06:43:23.22 |
-64:21:25.9 |
HIP 32079 |
12.93 |
| 2026-08-04 00:00 |
06:43:28.04 |
-64:21:43.3 |
HIP 32079 |
13.04 |
| 2026-08-04 12:00 |
06:43:32.83 |
-64:22:01.1 |
HIP 32079 |
13.18 |
| 2026-08-05 00:00 |
06:43:37.60 |
-64:22:19.0 |
HIP 32079 |
13.34 |
| 2026-08-05 12:00 |
06:43:42.35 |
-64:22:37.2 |
HIP 32079 |
13.52 |
| 2026-08-06 00:00 |
06:43:47.08 |
-64:22:55.6 |
HIP 32079 |
13.71 |
| 2026-08-06 12:00 |
06:43:51.78 |
-64:23:14.3 |
HIP 32079 |
13.93 |
| 2026-08-07 00:00 |
06:43:56.46 |
-64:23:33.2 |
HIP 32079 |
14.16 |
| 2026-08-07 12:00 |
06:44:01.12 |
-64:23:52.4 |
HIP 32079 |
14.41 |
| 2026-08-08 00:00 |
06:44:05.75 |
-64:24:11.8 |
HIP 32079 |
14.67 |
| 2026-08-08 12:00 |
06:44:10.35 |
-64:24:31.4 |
HIP 32079 |
14.95 |
| 2026-08-09 00:00 |
06:44:14.94 |
-64:24:51.2 |
HIP 32079 |
15.24 |
| 2026-08-09 12:00 |
06:44:19.49 |
-64:25:11.3 |
HIP 32079 |
15.55 |
| 2026-08-10 00:00 |
06:44:24.02 |
-64:25:31.7 |
HIP 32079 |
15.86 |
| 2026-08-10 12:00 |
06:44:28.52 |
-64:25:52.2 |
HIP 32079 |
16.19 |
| 2026-08-11 00:00 |
06:44:33.00 |
-64:26:13.0 |
HIP 32079 |
16.53 |
| 2026-08-11 12:00 |
06:44:37.45 |
-64:26:34.0 |
HIP 32079 |
16.88 |
| 2026-08-12 00:00 |
06:44:41.87 |
-64:26:55.2 |
HIP 32079 |
17.24 |
| 2026-08-12 12:00 |
06:44:46.27 |
-64:27:16.7 |
HIP 32079 |
17.61 |
| 2026-08-13 00:00 |
06:44:50.64 |
-64:27:38.4 |
HIP 32079 |
17.98 |
| 2026-08-13 12:00 |
06:44:54.97 |
-64:28:00.3 |
HIP 32079 |
18.37 |
| 2026-08-14 00:00 |
06:44:59.29 |
-64:28:22.4 |
HIP 32079 |
18.76 |
| 2026-08-14 12:00 |
06:45:03.57 |
-64:28:44.7 |
HIP 32079 |
19.15 |
| 2026-08-15 00:00 |
06:45:07.82 |
-64:29:07.3 |
HIP 32079 |
19.56 |
| 2026-08-15 12:00 |
06:45:12.05 |
-64:29:30.1 |
HIP 32079 |
19.97 |
| 2026-08-16 00:00 |
06:45:16.24 |
-64:29:53.1 |
HIP 32079 |
20.38 |
| 2026-08-16 12:00 |
06:45:20.41 |
-64:30:16.3 |
HIP 32079 |
20.80 |
| 2026-08-17 00:00 |
06:45:24.54 |
-64:30:39.7 |
HIP 32079 |
21.22 |
| 2026-08-17 12:00 |
06:45:28.64 |
-64:31:03.3 |
HIP 32079 |
21.65 |
| 2026-08-18 00:00 |
06:45:32.72 |
-64:31:27.1 |
HIP 32079 |
22.08 |
| 2026-08-18 12:00 |
06:45:36.76 |
-64:31:51.2 |
HIP 32079 |
22.52 |
| 2026-08-19 00:00 |
06:45:40.77 |
-64:32:15.4 |
HIP 32079 |
22.96 |