メタデータ
| 項目 |
値 |
| Designation |
72P/Denning-Fujikawa |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-07-12T06:43:54.975360Z |
| Orbit solution date (soln_date, UTC) |
2023-11-14T12:33:10Z |
| Obs used |
66 |
| NEO |
Yes |
| M1 |
17.500 |
| K1 |
19.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-21.0000000 |
| e |
0.82045974 |
| q (au) |
0.780529 |
| a (au) |
4.347375 |
| i (deg) |
9.232915 |
| Ω (om, deg) |
35.435635 |
| ω (w, deg) |
338.472965 |
| M (ma, deg) |
47.377307 |
等級
散乱 + 全体線形
$$
M_a = (17.746 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.746 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.871 |
| 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 |
11:57:51.26 |
+04:33:11.5 |
HIP 58403 |
16.07 |
| 2026-07-29 12:00 |
11:58:01.55 |
+04:31:45.1 |
HIP 58403 |
13.42 |
| 2026-07-30 00:00 |
11:58:11.91 |
+04:30:18.4 |
HIP 58403 |
10.91 |
| 2026-07-30 12:00 |
11:58:22.34 |
+04:28:51.3 |
HIP 58403 |
8.67 |
| 2026-07-31 00:00 |
11:58:32.85 |
+04:27:23.9 |
HIP 58403 |
7.01 |
| 2026-07-31 12:00 |
11:58:43.42 |
+04:25:56.2 |
HIP 58403 |
6.41 |
| 2026-08-01 00:00 |
11:58:54.06 |
+04:24:28.1 |
HIP 58403 |
7.17 |
| 2026-08-01 12:00 |
11:59:04.78 |
+04:22:59.6 |
HIP 58403 |
8.96 |
| 2026-08-02 00:00 |
11:59:15.55 |
+04:21:30.8 |
HIP 58403 |
11.33 |
| 2026-08-02 12:00 |
11:59:26.40 |
+04:20:01.8 |
HIP 58403 |
13.98 |
| 2026-08-03 00:00 |
11:59:37.31 |
+04:18:32.3 |
HIP 58403 |
16.80 |
| 2026-08-03 12:00 |
11:59:48.29 |
+04:17:02.6 |
HIP 58564 |
15.52 |
| 2026-08-04 00:00 |
11:59:59.34 |
+04:15:32.5 |
HIP 58564 |
12.55 |
| 2026-08-04 12:00 |
12:00:10.45 |
+04:14:02.1 |
HIP 58564 |
9.67 |
| 2026-08-05 00:00 |
12:00:21.62 |
+04:12:31.5 |
HIP 58564 |
7.02 |
| 2026-08-05 12:00 |
12:00:32.86 |
+04:11:00.5 |
HIP 58564 |
5.01 |
| 2026-08-06 00:00 |
12:00:44.16 |
+04:09:29.2 |
HIP 58564 |
4.62 |
| 2026-08-06 12:00 |
12:00:55.53 |
+04:07:57.6 |
HIP 58564 |
6.18 |
| 2026-08-07 00:00 |
12:01:06.96 |
+04:06:25.7 |
HIP 58564 |
8.72 |
| 2026-08-07 12:00 |
12:01:18.45 |
+04:04:53.5 |
HIP 58564 |
11.63 |
| 2026-08-08 00:00 |
12:01:30.00 |
+04:03:21.0 |
HIP 58564 |
14.70 |
| 2026-08-08 12:00 |
12:01:41.61 |
+04:01:48.2 |
HIP 58564 |
17.85 |
| 2026-08-09 00:00 |
12:01:53.28 |
+04:00:15.2 |
HIP 58744 |
17.24 |
| 2026-08-09 12:00 |
12:02:05.01 |
+03:58:41.9 |
HIP 58744 |
15.71 |
| 2026-08-10 00:00 |
12:02:16.80 |
+03:57:08.3 |
HIP 58744 |
14.78 |
| 2026-08-10 12:00 |
12:02:28.65 |
+03:55:34.4 |
HIP 58744 |
14.57 |
| 2026-08-11 00:00 |
12:02:40.56 |
+03:54:00.3 |
HIP 58744 |
15.11 |
| 2026-08-11 12:00 |
12:02:52.52 |
+03:52:25.9 |
HIP 58744 |
16.34 |
| 2026-08-12 00:00 |
12:03:04.55 |
+03:50:51.2 |
HIP 58744 |
18.13 |
| 2026-08-12 12:00 |
12:03:16.62 |
+03:49:16.3 |
HIP 58744 |
20.34 |
| 2026-08-13 00:00 |
12:03:28.75 |
+03:47:41.2 |
HIP 58895 |
22.80 |
| 2026-08-13 12:00 |
12:03:40.94 |
+03:46:05.8 |
HIP 58895 |
19.41 |
| 2026-08-14 00:00 |
12:03:53.18 |
+03:44:30.1 |
HIP 58895 |
16.02 |
| 2026-08-14 12:00 |
12:04:05.48 |
+03:42:54.3 |
HIP 58895 |
12.66 |
| 2026-08-15 00:00 |
12:04:17.82 |
+03:41:18.2 |
HIP 58895 |
9.34 |
| 2026-08-15 12:00 |
12:04:30.22 |
+03:39:41.9 |
HIP 58895 |
6.19 |
| 2026-08-16 00:00 |
12:04:42.67 |
+03:38:05.3 |
HIP 58895 |
3.70 |
| 2026-08-16 12:00 |
12:04:55.17 |
+03:36:28.6 |
HIP 58895 |
3.68 |
| 2026-08-17 00:00 |
12:05:07.72 |
+03:34:51.6 |
HIP 58895 |
6.19 |
| 2026-08-17 12:00 |
12:05:20.33 |
+03:33:14.4 |
HIP 58895 |
9.38 |
| 2026-08-18 00:00 |
12:05:32.97 |
+03:31:37.0 |
HIP 58895 |
12.77 |
| 2026-08-18 12:00 |
12:05:45.67 |
+03:29:59.4 |
HIP 58895 |
16.24 |
| 2026-08-19 00:00 |
12:05:58.42 |
+03:28:21.7 |
HIP 58895 |
19.76 |