489P/Denning
メタデータ
| 項目 |
値 |
| Designation |
489P/Denning |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-04-20T21:15:31.694400Z |
| Orbit solution date (soln_date, UTC) |
2024-10-11T13:45:58Z |
| Obs used |
302 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
49.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2007-04-17T03:02:00.096000Z |
| Discovery magnitude (MPC) |
18.70 |
| Discovery observatory (MPC) |
704 · Lincoln Laboratory ETS, New Mexico |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-08-18.0000000 |
| e |
0.64560760 |
| q (au) |
1.574689 |
| a (au) |
4.443348 |
| i (deg) |
4.007070 |
| Ω (om, deg) |
22.578905 |
| ω (w, deg) |
107.960844 |
| M (ma, deg) |
180.384811 |
等級
散乱 + 全体線形
$$
M_a = (13.591 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.591 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:16:32.96 |
-04:09:48.1 |
HIP 64731 |
17.15 |
| 2026-02-03 12:00 |
13:16:58.61 |
-04:13:24.0 |
HIP 64731 |
23.55 |
| 2026-02-04 00:00 |
13:17:23.67 |
-04:16:56.7 |
HIP 64811 |
27.21 |
| 2026-02-04 12:00 |
13:17:48.13 |
-04:20:26.3 |
HIP 64811 |
25.98 |
| 2026-02-05 00:00 |
13:18:11.98 |
-04:23:52.7 |
HIP 64811 |
26.54 |
| 2026-02-05 12:00 |
13:18:35.24 |
-04:27:16.0 |
HIP 64811 |
28.69 |
| 2026-02-06 00:00 |
13:18:57.88 |
-04:30:36.1 |
HIP 64811 |
32.00 |
| 2026-02-06 12:00 |
13:19:19.91 |
-04:33:53.1 |
HIP 64811 |
36.07 |
| 2026-02-07 00:00 |
13:19:41.32 |
-04:37:06.9 |
HIP 65243 |
37.50 |
| 2026-02-07 12:00 |
13:20:02.12 |
-04:40:17.4 |
HIP 65243 |
32.23 |
| 2026-02-08 00:00 |
13:20:22.30 |
-04:43:24.8 |
HIP 65243 |
27.44 |
| 2026-02-08 12:00 |
13:20:41.86 |
-04:46:29.0 |
HIP 65243 |
23.31 |
| 2026-02-09 00:00 |
13:21:00.79 |
-04:49:30.0 |
HIP 65243 |
20.12 |
| 2026-02-09 12:00 |
13:21:19.09 |
-04:52:27.7 |
HIP 65243 |
18.21 |
| 2026-02-10 00:00 |
13:21:36.77 |
-04:55:22.3 |
HIP 65243 |
17.84 |
| 2026-02-10 12:00 |
13:21:53.82 |
-04:58:13.6 |
HIP 65243 |
18.98 |
| 2026-02-11 00:00 |
13:22:10.23 |
-05:01:01.8 |
HIP 65323 |
17.99 |
| 2026-02-11 12:00 |
13:22:26.01 |
-05:03:46.7 |
HIP 65323 |
15.58 |
| 2026-02-12 00:00 |
13:22:41.15 |
-05:06:28.4 |
HIP 65323 |
14.48 |
| 2026-02-12 12:00 |
13:22:55.65 |
-05:09:06.8 |
HIP 65323 |
14.83 |
| 2026-02-13 00:00 |
13:23:09.51 |
-05:11:42.0 |
HIP 65379 |
11.99 |
| 2026-02-13 12:00 |
13:23:22.74 |
-05:14:14.0 |
HIP 65379 |
9.92 |
| 2026-02-14 00:00 |
13:23:35.32 |
-05:16:42.8 |
HIP 65379 |
9.39 |
| 2026-02-14 12:00 |
13:23:47.26 |
-05:19:08.4 |
HIP 65379 |
10.47 |
| 2026-02-15 00:00 |
13:23:58.55 |
-05:21:30.7 |
HIP 65379 |
12.61 |
| 2026-02-15 12:00 |
13:24:09.20 |
-05:23:49.9 |
HIP 65420 |
15.21 |
| 2026-02-16 00:00 |
13:24:19.21 |
-05:26:05.8 |
HIP 65420 |
16.63 |
| 2026-02-16 12:00 |
13:24:28.57 |
-05:28:18.5 |
HIP 65420 |
18.51 |
| 2026-02-17 00:00 |
13:24:37.28 |
-05:30:28.0 |
HIP 65420 |
20.66 |
| 2026-02-17 12:00 |
13:24:45.36 |
-05:32:34.4 |
HIP 65420 |
22.94 |
| 2026-02-18 00:00 |
13:24:52.78 |
-05:34:37.5 |
HIP 65420 |
25.27 |
| 2026-02-18 12:00 |
13:24:59.57 |
-05:36:37.5 |
HIP 65420 |
27.59 |
| 2026-02-19 00:00 |
13:25:05.71 |
-05:38:34.3 |
HIP 65420 |
29.86 |
| 2026-02-19 12:00 |
13:25:11.21 |
-05:40:28.0 |
HIP 65590 |
29.73 |
| 2026-02-20 00:00 |
13:25:16.07 |
-05:42:18.5 |
HIP 65590 |
27.76 |
| 2026-02-20 12:00 |
13:25:20.30 |
-05:44:05.9 |
HIP 65590 |
25.99 |
| 2026-02-21 00:00 |
13:25:23.88 |
-05:45:50.2 |
HIP 65590 |
24.44 |
| 2026-02-21 12:00 |
13:25:26.83 |
-05:47:31.4 |
HIP 65590 |
23.11 |
| 2026-02-22 00:00 |
13:25:29.15 |
-05:49:09.5 |
HIP 65590 |
22.02 |
| 2026-02-22 12:00 |
13:25:30.84 |
-05:50:44.5 |
HIP 65590 |
21.18 |
| 2026-02-23 00:00 |
13:25:31.91 |
-05:52:16.5 |
HIP 65590 |
20.61 |
| 2026-02-23 12:00 |
13:25:32.35 |
-05:53:45.5 |
HIP 65590 |
20.29 |
| 2026-02-24 00:00 |
13:25:32.16 |
-05:55:11.4 |
HIP 65590 |
20.24 |