メタデータ
| 項目 |
値 |
| Designation |
C/1994 J2 (Takamizawa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-06-29T14:44:36.781440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
399 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
4.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1994-12-15.0000000 |
| e |
0.99623127 |
| q (au) |
1.947740 |
| a (au) |
516.815888 |
| i (deg) |
135.961791 |
| Ω (om, deg) |
51.129192 |
| ω (w, deg) |
192.116161 |
| M (ma, deg) |
0.014126 |
等級
散乱 + 全体線形
$$
M_a = (8.389 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.389 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.972 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
03:51:34.22 |
+13:38:42.3 |
HIP 18145 |
25.32 |
| 2026-09-20 12:00 |
03:51:33.12 |
+13:38:36.4 |
HIP 18145 |
25.58 |
| 2026-09-21 00:00 |
03:51:32.00 |
+13:38:30.5 |
HIP 18145 |
25.84 |
| 2026-09-21 12:00 |
03:51:30.86 |
+13:38:24.5 |
HIP 18145 |
26.10 |
| 2026-09-22 00:00 |
03:51:29.71 |
+13:38:18.5 |
HIP 18145 |
26.37 |
| 2026-09-22 12:00 |
03:51:28.54 |
+13:38:12.5 |
HIP 18145 |
26.65 |
| 2026-09-23 00:00 |
03:51:27.36 |
+13:38:06.4 |
HIP 18145 |
26.92 |
| 2026-09-23 12:00 |
03:51:26.15 |
+13:38:00.2 |
HIP 18145 |
27.20 |
| 2026-09-24 00:00 |
03:51:24.93 |
+13:37:54.1 |
HIP 18145 |
27.49 |
| 2026-09-24 12:00 |
03:51:23.70 |
+13:37:47.9 |
HIP 18145 |
27.78 |
| 2026-09-25 00:00 |
03:51:22.45 |
+13:37:41.6 |
HIP 18145 |
28.07 |
| 2026-09-25 12:00 |
03:51:21.18 |
+13:37:35.4 |
HIP 18145 |
28.37 |
| 2026-09-26 00:00 |
03:51:19.89 |
+13:37:29.1 |
HIP 18145 |
28.67 |
| 2026-09-26 12:00 |
03:51:18.59 |
+13:37:22.7 |
HIP 18145 |
28.97 |
| 2026-09-27 00:00 |
03:51:17.28 |
+13:37:16.3 |
HIP 18145 |
29.28 |
| 2026-09-27 12:00 |
03:51:15.94 |
+13:37:09.9 |
HIP 18145 |
29.60 |
| 2026-09-28 00:00 |
03:51:14.60 |
+13:37:03.5 |
HIP 18145 |
29.91 |
| 2026-09-28 12:00 |
03:51:13.23 |
+13:36:57.0 |
HIP 18145 |
30.23 |
| 2026-09-29 00:00 |
03:51:11.85 |
+13:36:50.5 |
HIP 18145 |
30.56 |
| 2026-09-29 12:00 |
03:51:10.46 |
+13:36:44.0 |
HIP 18145 |
30.89 |
| 2026-09-30 00:00 |
03:51:09.05 |
+13:36:37.4 |
HIP 18145 |
31.22 |
| 2026-09-30 12:00 |
03:51:07.62 |
+13:36:30.8 |
HIP 18145 |
31.55 |
| 2026-10-01 00:00 |
03:51:06.18 |
+13:36:24.2 |
HIP 18145 |
31.89 |
| 2026-10-01 12:00 |
03:51:04.72 |
+13:36:17.5 |
HIP 18145 |
32.24 |
| 2026-10-02 00:00 |
03:51:03.25 |
+13:36:10.8 |
HIP 18145 |
32.58 |
| 2026-10-02 12:00 |
03:51:01.76 |
+13:36:04.1 |
HIP 18145 |
32.93 |
| 2026-10-03 00:00 |
03:51:00.26 |
+13:35:57.4 |
HIP 18145 |
33.29 |
| 2026-10-03 12:00 |
03:50:58.74 |
+13:35:50.6 |
HIP 18033 |
33.34 |
| 2026-10-04 00:00 |
03:50:57.21 |
+13:35:43.8 |
HIP 18033 |
33.27 |
| 2026-10-04 12:00 |
03:50:55.66 |
+13:35:37.0 |
HIP 18033 |
33.21 |
| 2026-10-05 00:00 |
03:50:54.10 |
+13:35:30.1 |
HIP 18033 |
33.16 |
| 2026-10-05 12:00 |
03:50:52.52 |
+13:35:23.2 |
HIP 18033 |
33.11 |
| 2026-10-06 00:00 |
03:50:50.93 |
+13:35:16.3 |
HIP 18033 |
33.06 |
| 2026-10-06 12:00 |
03:50:49.33 |
+13:35:09.4 |
HIP 18033 |
33.03 |
| 2026-10-07 00:00 |
03:50:47.71 |
+13:35:02.4 |
HIP 18033 |
32.99 |
| 2026-10-07 12:00 |
03:50:46.08 |
+13:34:55.5 |
HIP 18033 |
32.96 |
| 2026-10-08 00:00 |
03:50:44.43 |
+13:34:48.5 |
HIP 18033 |
32.94 |
| 2026-10-08 12:00 |
03:50:42.77 |
+13:34:41.4 |
HIP 18033 |
32.92 |
| 2026-10-09 00:00 |
03:50:41.09 |
+13:34:34.4 |
HIP 18033 |
32.91 |
| 2026-10-09 12:00 |
03:50:39.40 |
+13:34:27.3 |
HIP 18033 |
32.91 |
| 2026-10-10 00:00 |
03:50:37.70 |
+13:34:20.2 |
HIP 18033 |
32.91 |
| 2026-10-10 12:00 |
03:50:35.98 |
+13:34:13.1 |
HIP 18033 |
32.91 |
| 2026-10-11 00:00 |
03:50:34.25 |
+13:34:06.0 |
HIP 18033 |
32.93 |