C/2016 J2 (Denneau)
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
$$
M_a = (18.665 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.665 |
| n |
2.000 |
| gf |
1.000 |
| 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) |
| 2026-02-03 00:00 |
02:53:42.60 |
+65:53:05.3 |
HIP 13670 |
15.05 |
| 2026-02-03 12:00 |
02:53:41.69 |
+65:52:04.5 |
HIP 13670 |
14.87 |
| 2026-02-04 00:00 |
02:53:40.88 |
+65:51:03.8 |
HIP 13670 |
14.74 |
| 2026-02-04 12:00 |
02:53:40.18 |
+65:50:03.3 |
HIP 13670 |
14.67 |
| 2026-02-05 00:00 |
02:53:39.57 |
+65:49:02.9 |
HIP 13376 |
14.52 |
| 2026-02-05 12:00 |
02:53:39.07 |
+65:48:02.7 |
HIP 13376 |
13.75 |
| 2026-02-06 00:00 |
02:53:38.67 |
+65:47:02.6 |
HIP 13376 |
13.01 |
| 2026-02-06 12:00 |
02:53:38.37 |
+65:46:02.7 |
HIP 13376 |
12.33 |
| 2026-02-07 00:00 |
02:53:38.18 |
+65:45:03.0 |
HIP 13376 |
11.70 |
| 2026-02-07 12:00 |
02:53:38.08 |
+65:44:03.4 |
HIP 13376 |
11.13 |
| 2026-02-08 00:00 |
02:53:38.09 |
+65:43:04.1 |
HIP 13376 |
10.64 |
| 2026-02-08 12:00 |
02:53:38.19 |
+65:42:04.9 |
HIP 13376 |
10.23 |
| 2026-02-09 00:00 |
02:53:38.40 |
+65:41:05.9 |
HIP 13376 |
9.91 |
| 2026-02-09 12:00 |
02:53:38.70 |
+65:40:07.1 |
HIP 13376 |
9.70 |
| 2026-02-10 00:00 |
02:53:39.11 |
+65:39:08.6 |
HIP 13376 |
9.59 |
| 2026-02-10 12:00 |
02:53:39.61 |
+65:38:10.2 |
HIP 13376 |
9.59 |
| 2026-02-11 00:00 |
02:53:40.21 |
+65:37:12.0 |
HIP 13376 |
9.70 |
| 2026-02-11 12:00 |
02:53:40.91 |
+65:36:14.0 |
HIP 13376 |
9.91 |
| 2026-02-12 00:00 |
02:53:41.71 |
+65:35:16.3 |
HIP 13376 |
10.22 |
| 2026-02-12 12:00 |
02:53:42.60 |
+65:34:18.7 |
HIP 13376 |
10.61 |
| 2026-02-13 00:00 |
02:53:43.59 |
+65:33:21.4 |
HIP 13376 |
11.09 |
| 2026-02-13 12:00 |
02:53:44.68 |
+65:32:24.3 |
HIP 13376 |
11.63 |
| 2026-02-14 00:00 |
02:53:45.87 |
+65:31:27.5 |
HIP 13376 |
12.23 |
| 2026-02-14 12:00 |
02:53:47.15 |
+65:30:30.8 |
HIP 13376 |
12.87 |
| 2026-02-15 00:00 |
02:53:48.53 |
+65:29:34.4 |
HIP 13376 |
13.56 |
| 2026-02-15 12:00 |
02:53:50.00 |
+65:28:38.3 |
HIP 13376 |
14.29 |
| 2026-02-16 00:00 |
02:53:51.57 |
+65:27:42.4 |
HIP 13376 |
15.04 |
| 2026-02-16 12:00 |
02:53:53.23 |
+65:26:46.8 |
HIP 13376 |
15.82 |
| 2026-02-17 00:00 |
02:53:54.98 |
+65:25:51.4 |
HIP 13376 |
16.62 |
| 2026-02-17 12:00 |
02:53:56.83 |
+65:24:56.2 |
HIP 13376 |
17.43 |
| 2026-02-18 00:00 |
02:53:58.78 |
+65:24:01.4 |
HIP 13376 |
18.26 |
| 2026-02-18 12:00 |
02:54:00.81 |
+65:23:06.7 |
HIP 13376 |
19.11 |
| 2026-02-19 00:00 |
02:54:02.94 |
+65:22:12.4 |
HIP 13376 |
19.96 |
| 2026-02-19 12:00 |
02:54:05.16 |
+65:21:18.3 |
HIP 13376 |
20.82 |
| 2026-02-20 00:00 |
02:54:07.47 |
+65:20:24.5 |
HIP 13376 |
21.69 |
| 2026-02-20 12:00 |
02:54:09.87 |
+65:19:31.0 |
HIP 13376 |
22.57 |
| 2026-02-21 00:00 |
02:54:12.36 |
+65:18:37.8 |
HIP 13376 |
23.45 |
| 2026-02-21 12:00 |
02:54:14.94 |
+65:17:44.9 |
HIP 13376 |
24.33 |
| 2026-02-22 00:00 |
02:54:17.61 |
+65:16:52.2 |
HIP 13376 |
25.22 |
| 2026-02-22 12:00 |
02:54:20.37 |
+65:15:59.8 |
HIP 13376 |
26.12 |
| 2026-02-23 00:00 |
02:54:23.21 |
+65:15:07.8 |
HIP 13376 |
27.01 |
| 2026-02-23 12:00 |
02:54:26.15 |
+65:14:16.0 |
HIP 13376 |
27.91 |
| 2026-02-24 00:00 |
02:54:29.17 |
+65:13:24.5 |
HIP 13376 |
28.81 |