メタデータ
| 項目 |
値 |
| Designation |
C/2004 D1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-10T18:19:51.231360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:37Z |
| Obs used |
507 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
8.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-11-18.0000000 |
| e |
1.00161667 |
| q (au) |
4.974589 |
| a (au) |
-3077.055898 |
| i (deg) |
45.537431 |
| Ω (om, deg) |
62.252904 |
| ω (w, deg) |
75.536768 |
| M (ma, deg) |
-0.000489 |
等級
散乱 + 全体線形
$$
M_a = (3.833 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.833 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.841 |
| k |
0.990 |
| δ90 |
9.998 |
| 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 |
17:36:20.69 |
-46:42:22.1 |
HIP 86092 |
13.95 |
| 2026-07-29 12:00 |
17:36:17.56 |
-46:42:11.0 |
HIP 86092 |
13.52 |
| 2026-07-30 00:00 |
17:36:14.45 |
-46:41:59.8 |
HIP 86092 |
13.11 |
| 2026-07-30 12:00 |
17:36:11.37 |
-46:41:48.5 |
HIP 86092 |
12.70 |
| 2026-07-31 00:00 |
17:36:08.32 |
-46:41:37.1 |
HIP 86092 |
12.31 |
| 2026-07-31 12:00 |
17:36:05.30 |
-46:41:25.6 |
HIP 86092 |
11.94 |
| 2026-08-01 00:00 |
17:36:02.30 |
-46:41:13.9 |
HIP 86092 |
11.57 |
| 2026-08-01 12:00 |
17:35:59.33 |
-46:41:02.2 |
HIP 86092 |
11.22 |
| 2026-08-02 00:00 |
17:35:56.39 |
-46:40:50.3 |
HIP 86092 |
10.89 |
| 2026-08-02 12:00 |
17:35:53.48 |
-46:40:38.4 |
HIP 86092 |
10.58 |
| 2026-08-03 00:00 |
17:35:50.60 |
-46:40:26.3 |
HIP 86092 |
10.28 |
| 2026-08-03 12:00 |
17:35:47.75 |
-46:40:14.2 |
HIP 86092 |
10.00 |
| 2026-08-04 00:00 |
17:35:44.93 |
-46:40:02.0 |
HIP 86092 |
9.74 |
| 2026-08-04 12:00 |
17:35:42.13 |
-46:39:49.6 |
HIP 86092 |
9.50 |
| 2026-08-05 00:00 |
17:35:39.37 |
-46:39:37.2 |
HIP 86092 |
9.28 |
| 2026-08-05 12:00 |
17:35:36.63 |
-46:39:24.6 |
HIP 86092 |
9.09 |
| 2026-08-06 00:00 |
17:35:33.93 |
-46:39:12.0 |
HIP 86092 |
8.92 |
| 2026-08-06 12:00 |
17:35:31.26 |
-46:38:59.3 |
HIP 86092 |
8.77 |
| 2026-08-07 00:00 |
17:35:28.62 |
-46:38:46.5 |
HIP 86092 |
8.65 |
| 2026-08-07 12:00 |
17:35:26.01 |
-46:38:33.6 |
HIP 86092 |
8.55 |
| 2026-08-08 00:00 |
17:35:23.43 |
-46:38:20.6 |
HIP 86092 |
8.48 |
| 2026-08-08 12:00 |
17:35:20.88 |
-46:38:07.5 |
HIP 86092 |
8.43 |
| 2026-08-09 00:00 |
17:35:18.36 |
-46:37:54.4 |
HIP 86092 |
8.41 |
| 2026-08-09 12:00 |
17:35:15.88 |
-46:37:41.1 |
HIP 86092 |
8.41 |
| 2026-08-10 00:00 |
17:35:13.42 |
-46:37:27.8 |
HIP 86092 |
8.43 |
| 2026-08-10 12:00 |
17:35:11.00 |
-46:37:14.4 |
HIP 86092 |
8.48 |
| 2026-08-11 00:00 |
17:35:08.61 |
-46:37:00.9 |
HIP 86092 |
8.54 |
| 2026-08-11 12:00 |
17:35:06.26 |
-46:36:47.4 |
HIP 86092 |
8.63 |
| 2026-08-12 00:00 |
17:35:03.94 |
-46:36:33.7 |
HIP 86092 |
8.74 |
| 2026-08-12 12:00 |
17:35:01.65 |
-46:36:20.0 |
HIP 86092 |
8.86 |
| 2026-08-13 00:00 |
17:34:59.39 |
-46:36:06.2 |
HIP 86092 |
9.00 |
| 2026-08-13 12:00 |
17:34:57.17 |
-46:35:52.3 |
HIP 85957 |
9.10 |
| 2026-08-14 00:00 |
17:34:54.98 |
-46:35:38.4 |
HIP 85957 |
8.73 |
| 2026-08-14 12:00 |
17:34:52.83 |
-46:35:24.4 |
HIP 85957 |
8.38 |
| 2026-08-15 00:00 |
17:34:50.71 |
-46:35:10.3 |
HIP 85957 |
8.04 |
| 2026-08-15 12:00 |
17:34:48.62 |
-46:34:56.2 |
HIP 85957 |
7.71 |
| 2026-08-16 00:00 |
17:34:46.57 |
-46:34:42.0 |
HIP 85957 |
7.40 |
| 2026-08-16 12:00 |
17:34:44.55 |
-46:34:27.7 |
HIP 85957 |
7.11 |
| 2026-08-17 00:00 |
17:34:42.57 |
-46:34:13.4 |
HIP 85957 |
6.84 |
| 2026-08-17 12:00 |
17:34:40.62 |
-46:33:59.0 |
HIP 85957 |
6.59 |
| 2026-08-18 00:00 |
17:34:38.71 |
-46:33:44.5 |
HIP 85957 |
6.36 |
| 2026-08-18 12:00 |
17:34:36.83 |
-46:33:30.0 |
HIP 85957 |
6.15 |
| 2026-08-19 00:00 |
17:34:34.99 |
-46:33:15.4 |
HIP 85957 |
5.97 |