メタデータ
| 項目 |
値 |
| Designation |
C/2016 J2 (Denneau) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-04-11T23:26:33.532800Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T00:42:36Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
17.200 |
| 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) |
2016-03-20.0000000 |
| e |
1.00064898 |
| q (au) |
1.518730 |
| a (au) |
-2340.194593 |
| i (deg) |
130.346599 |
| Ω (om, deg) |
186.183773 |
| ω (w, deg) |
318.487333 |
| M (ma, deg) |
-0.000200 |
等級
散乱 + 全体線形
$$
M_a = (18.666 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.666 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.801 |
| 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) |
| 2026-07-29 00:00 |
03:32:48.78 |
+65:41:25.2 |
HIP 16580 |
9.17 |
| 2026-07-29 12:00 |
03:32:51.63 |
+65:42:12.7 |
HIP 16580 |
9.78 |
| 2026-07-30 00:00 |
03:32:54.40 |
+65:43:00.2 |
HIP 16580 |
10.43 |
| 2026-07-30 12:00 |
03:32:57.09 |
+65:43:47.8 |
HIP 16580 |
11.10 |
| 2026-07-31 00:00 |
03:32:59.70 |
+65:44:35.5 |
HIP 16580 |
11.80 |
| 2026-07-31 12:00 |
03:33:02.22 |
+65:45:23.2 |
HIP 16580 |
12.52 |
| 2026-08-01 00:00 |
03:33:04.66 |
+65:46:10.9 |
HIP 16580 |
13.26 |
| 2026-08-01 12:00 |
03:33:07.02 |
+65:46:58.7 |
HIP 16580 |
14.01 |
| 2026-08-02 00:00 |
03:33:09.29 |
+65:47:46.6 |
HIP 16580 |
14.77 |
| 2026-08-02 12:00 |
03:33:11.48 |
+65:48:34.4 |
HIP 16580 |
15.53 |
| 2026-08-03 00:00 |
03:33:13.58 |
+65:49:22.3 |
HIP 16580 |
16.31 |
| 2026-08-03 12:00 |
03:33:15.60 |
+65:50:10.3 |
HIP 16580 |
17.09 |
| 2026-08-04 00:00 |
03:33:17.53 |
+65:50:58.2 |
HIP 16580 |
17.88 |
| 2026-08-04 12:00 |
03:33:19.38 |
+65:51:46.2 |
HIP 16580 |
18.67 |
| 2026-08-05 00:00 |
03:33:21.14 |
+65:52:34.2 |
HIP 16580 |
19.46 |
| 2026-08-05 12:00 |
03:33:22.81 |
+65:53:22.3 |
HIP 16580 |
20.26 |
| 2026-08-06 00:00 |
03:33:24.39 |
+65:54:10.3 |
HIP 16580 |
21.06 |
| 2026-08-06 12:00 |
03:33:25.89 |
+65:54:58.4 |
HIP 16580 |
21.86 |
| 2026-08-07 00:00 |
03:33:27.30 |
+65:55:46.4 |
HIP 16580 |
22.66 |
| 2026-08-07 12:00 |
03:33:28.62 |
+65:56:34.5 |
HIP 16580 |
23.46 |
| 2026-08-08 00:00 |
03:33:29.85 |
+65:57:22.6 |
HIP 16580 |
24.26 |
| 2026-08-08 12:00 |
03:33:30.99 |
+65:58:10.6 |
HIP 16580 |
25.06 |
| 2026-08-09 00:00 |
03:33:32.04 |
+65:58:58.7 |
HIP 16580 |
25.87 |
| 2026-08-09 12:00 |
03:33:33.00 |
+65:59:46.8 |
HIP 16580 |
26.67 |
| 2026-08-10 00:00 |
03:33:33.87 |
+66:00:34.8 |
HIP 16907 |
27.35 |
| 2026-08-10 12:00 |
03:33:34.65 |
+66:01:22.8 |
HIP 16907 |
27.64 |
| 2026-08-11 00:00 |
03:33:35.34 |
+66:02:10.8 |
HIP 16907 |
27.95 |
| 2026-08-11 12:00 |
03:33:35.94 |
+66:02:58.8 |
HIP 16907 |
28.30 |
| 2026-08-12 00:00 |
03:33:36.44 |
+66:03:46.8 |
HIP 16907 |
28.67 |
| 2026-08-12 12:00 |
03:33:36.85 |
+66:04:34.7 |
HIP 16907 |
29.06 |
| 2026-08-13 00:00 |
03:33:37.18 |
+66:05:22.6 |
HIP 16907 |
29.48 |
| 2026-08-13 12:00 |
03:33:37.40 |
+66:06:10.5 |
HIP 16907 |
29.92 |
| 2026-08-14 00:00 |
03:33:37.54 |
+66:06:58.3 |
HIP 16907 |
30.38 |
| 2026-08-14 12:00 |
03:33:37.58 |
+66:07:46.0 |
HIP 16907 |
30.87 |
| 2026-08-15 00:00 |
03:33:37.52 |
+66:08:33.7 |
HIP 16907 |
31.37 |
| 2026-08-15 12:00 |
03:33:37.38 |
+66:09:21.4 |
HIP 16907 |
31.89 |
| 2026-08-16 00:00 |
03:33:37.14 |
+66:10:09.0 |
HIP 16907 |
32.43 |
| 2026-08-16 12:00 |
03:33:36.80 |
+66:10:56.5 |
HIP 16907 |
32.98 |
| 2026-08-17 00:00 |
03:33:36.37 |
+66:11:44.0 |
HIP 16907 |
33.55 |
| 2026-08-17 12:00 |
03:33:35.85 |
+66:12:31.4 |
HIP 16907 |
34.14 |
| 2026-08-18 00:00 |
03:33:35.23 |
+66:13:18.7 |
HIP 16404 |
33.68 |
| 2026-08-18 12:00 |
03:33:34.51 |
+66:14:06.0 |
HIP 16404 |
32.93 |
| 2026-08-19 00:00 |
03:33:33.70 |
+66:14:53.2 |
HIP 16404 |
32.18 |