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) |
| 2026-06-01 00:00 |
17:44:09.59 |
-46:47:24.9 |
HIP 86857 |
6.57 |
| 2026-06-01 12:00 |
17:44:05.41 |
-46:47:31.8 |
HIP 86857 |
7.29 |
| 2026-06-02 00:00 |
17:44:01.22 |
-46:47:38.5 |
HIP 86857 |
8.01 |
| 2026-06-02 12:00 |
17:43:57.02 |
-46:47:45.0 |
HIP 86857 |
8.74 |
| 2026-06-03 00:00 |
17:43:52.80 |
-46:47:51.4 |
HIP 86857 |
9.46 |
| 2026-06-03 12:00 |
17:43:48.58 |
-46:47:57.5 |
HIP 86857 |
10.19 |
| 2026-06-04 00:00 |
17:43:44.35 |
-46:48:03.6 |
HIP 86857 |
10.92 |
| 2026-06-04 12:00 |
17:43:40.11 |
-46:48:09.4 |
HIP 86857 |
11.65 |
| 2026-06-05 00:00 |
17:43:35.86 |
-46:48:15.1 |
HIP 86764 |
11.96 |
| 2026-06-05 12:00 |
17:43:31.60 |
-46:48:20.6 |
HIP 86764 |
12.16 |
| 2026-06-06 00:00 |
17:43:27.33 |
-46:48:25.9 |
HIP 86764 |
12.40 |
| 2026-06-06 12:00 |
17:43:23.06 |
-46:48:31.1 |
HIP 86764 |
12.68 |
| 2026-06-07 00:00 |
17:43:18.77 |
-46:48:36.1 |
HIP 86764 |
12.98 |
| 2026-06-07 12:00 |
17:43:14.48 |
-46:48:40.9 |
HIP 86764 |
13.32 |
| 2026-06-08 00:00 |
17:43:10.18 |
-46:48:45.6 |
HIP 86764 |
13.69 |
| 2026-06-08 12:00 |
17:43:05.88 |
-46:48:50.1 |
HIP 86735 |
13.92 |
| 2026-06-09 00:00 |
17:43:01.57 |
-46:48:54.4 |
HIP 86735 |
14.18 |
| 2026-06-09 12:00 |
17:42:57.25 |
-46:48:58.6 |
HIP 86735 |
14.46 |
| 2026-06-10 00:00 |
17:42:52.93 |
-46:49:02.5 |
HIP 86735 |
14.78 |
| 2026-06-10 12:00 |
17:42:48.60 |
-46:49:06.3 |
HIP 86735 |
15.12 |
| 2026-06-11 00:00 |
17:42:44.27 |
-46:49:10.0 |
HIP 86735 |
15.49 |
| 2026-06-11 12:00 |
17:42:39.93 |
-46:49:13.4 |
HIP 86552 |
15.55 |
| 2026-06-12 00:00 |
17:42:35.59 |
-46:49:16.7 |
HIP 86552 |
14.84 |
| 2026-06-12 12:00 |
17:42:31.25 |
-46:49:19.8 |
HIP 86552 |
14.15 |
| 2026-06-13 00:00 |
17:42:26.90 |
-46:49:22.8 |
HIP 86552 |
13.45 |
| 2026-06-13 12:00 |
17:42:22.55 |
-46:49:25.5 |
HIP 86552 |
12.77 |
| 2026-06-14 00:00 |
17:42:18.19 |
-46:49:28.1 |
HIP 86552 |
12.09 |
| 2026-06-14 12:00 |
17:42:13.84 |
-46:49:30.6 |
HIP 86552 |
11.43 |
| 2026-06-15 00:00 |
17:42:09.48 |
-46:49:32.8 |
HIP 86552 |
10.77 |
| 2026-06-15 12:00 |
17:42:05.12 |
-46:49:34.9 |
HIP 86552 |
10.13 |
| 2026-06-16 00:00 |
17:42:00.76 |
-46:49:36.8 |
HIP 86552 |
9.51 |
| 2026-06-16 12:00 |
17:41:56.40 |
-46:49:38.5 |
HIP 86552 |
8.90 |
| 2026-06-17 00:00 |
17:41:52.04 |
-46:49:40.1 |
HIP 86552 |
8.32 |
| 2026-06-17 12:00 |
17:41:47.68 |
-46:49:41.5 |
HIP 86552 |
7.77 |
| 2026-06-18 00:00 |
17:41:43.32 |
-46:49:42.7 |
HIP 86552 |
7.26 |
| 2026-06-18 12:00 |
17:41:38.96 |
-46:49:43.7 |
HIP 86552 |
6.80 |
| 2026-06-19 00:00 |
17:41:34.60 |
-46:49:44.6 |
HIP 86552 |
6.39 |
| 2026-06-19 12:00 |
17:41:30.25 |
-46:49:45.3 |
HIP 86552 |
6.05 |
| 2026-06-20 00:00 |
17:41:25.89 |
-46:49:45.9 |
HIP 86552 |
5.78 |
| 2026-06-20 12:00 |
17:41:21.54 |
-46:49:46.2 |
HIP 86552 |
5.61 |
| 2026-06-21 00:00 |
17:41:17.19 |
-46:49:46.4 |
HIP 86552 |
5.54 |
| 2026-06-21 12:00 |
17:41:12.85 |
-46:49:46.4 |
HIP 86552 |
5.56 |
| 2026-06-22 00:00 |
17:41:08.51 |
-46:49:46.3 |
HIP 86552 |
5.69 |