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) |
| 2026-09-20 00:00 |
17:33:54.03 |
-46:16:47.6 |
HIP 85957 |
19.31 |
| 2026-09-20 12:00 |
17:33:54.62 |
-46:16:32.3 |
HIP 85957 |
19.56 |
| 2026-09-21 00:00 |
17:33:55.26 |
-46:16:17.0 |
HIP 85957 |
19.80 |
| 2026-09-21 12:00 |
17:33:55.93 |
-46:16:01.8 |
HIP 85957 |
20.05 |
| 2026-09-22 00:00 |
17:33:56.65 |
-46:15:46.6 |
HIP 85957 |
20.29 |
| 2026-09-22 12:00 |
17:33:57.40 |
-46:15:31.4 |
HIP 85957 |
20.54 |
| 2026-09-23 00:00 |
17:33:58.18 |
-46:15:16.3 |
HIP 85957 |
20.78 |
| 2026-09-23 12:00 |
17:33:59.01 |
-46:15:01.2 |
HIP 85957 |
21.03 |
| 2026-09-24 00:00 |
17:33:59.87 |
-46:14:46.1 |
HIP 85893 |
20.96 |
| 2026-09-24 12:00 |
17:34:00.77 |
-46:14:31.1 |
HIP 85893 |
20.80 |
| 2026-09-25 00:00 |
17:34:01.70 |
-46:14:16.1 |
HIP 85893 |
20.64 |
| 2026-09-25 12:00 |
17:34:02.68 |
-46:14:01.2 |
HIP 85893 |
20.49 |
| 2026-09-26 00:00 |
17:34:03.69 |
-46:13:46.3 |
HIP 85893 |
20.35 |
| 2026-09-26 12:00 |
17:34:04.74 |
-46:13:31.5 |
HIP 85893 |
20.21 |
| 2026-09-27 00:00 |
17:34:05.82 |
-46:13:16.7 |
HIP 85893 |
20.09 |
| 2026-09-27 12:00 |
17:34:06.95 |
-46:13:02.0 |
HIP 85893 |
19.97 |
| 2026-09-28 00:00 |
17:34:08.11 |
-46:12:47.3 |
HIP 85893 |
19.86 |
| 2026-09-28 12:00 |
17:34:09.30 |
-46:12:32.6 |
HIP 85893 |
19.75 |
| 2026-09-29 00:00 |
17:34:10.54 |
-46:12:18.0 |
HIP 85893 |
19.66 |
| 2026-09-29 12:00 |
17:34:11.81 |
-46:12:03.5 |
HIP 85893 |
19.57 |
| 2026-09-30 00:00 |
17:34:13.11 |
-46:11:49.0 |
HIP 85893 |
19.50 |
| 2026-09-30 12:00 |
17:34:14.45 |
-46:11:34.6 |
HIP 85893 |
19.43 |
| 2026-10-01 00:00 |
17:34:15.83 |
-46:11:20.2 |
HIP 85893 |
19.38 |
| 2026-10-01 12:00 |
17:34:17.25 |
-46:11:05.9 |
HIP 85893 |
19.33 |
| 2026-10-02 00:00 |
17:34:18.70 |
-46:10:51.7 |
HIP 85893 |
19.30 |
| 2026-10-02 12:00 |
17:34:20.19 |
-46:10:37.5 |
HIP 85893 |
19.27 |
| 2026-10-03 00:00 |
17:34:21.72 |
-46:10:23.4 |
HIP 85893 |
19.26 |
| 2026-10-03 12:00 |
17:34:23.28 |
-46:10:09.3 |
HIP 85893 |
19.26 |
| 2026-10-04 00:00 |
17:34:24.87 |
-46:09:55.3 |
HIP 85893 |
19.27 |
| 2026-10-04 12:00 |
17:34:26.51 |
-46:09:41.3 |
HIP 85893 |
19.29 |
| 2026-10-05 00:00 |
17:34:28.18 |
-46:09:27.5 |
HIP 85893 |
19.33 |
| 2026-10-05 12:00 |
17:34:29.88 |
-46:09:13.6 |
HIP 85893 |
19.38 |
| 2026-10-06 00:00 |
17:34:31.62 |
-46:08:59.9 |
HIP 85893 |
19.44 |
| 2026-10-06 12:00 |
17:34:33.40 |
-46:08:46.2 |
HIP 85893 |
19.51 |
| 2026-10-07 00:00 |
17:34:35.21 |
-46:08:32.6 |
HIP 85893 |
19.59 |
| 2026-10-07 12:00 |
17:34:37.05 |
-46:08:19.1 |
HIP 85893 |
19.69 |
| 2026-10-08 00:00 |
17:34:38.94 |
-46:08:05.6 |
HIP 85893 |
19.80 |
| 2026-10-08 12:00 |
17:34:40.85 |
-46:07:52.2 |
HIP 85893 |
19.92 |
| 2026-10-09 00:00 |
17:34:42.80 |
-46:07:38.9 |
HIP 85893 |
20.06 |
| 2026-10-09 12:00 |
17:34:44.79 |
-46:07:25.7 |
HIP 85893 |
20.21 |
| 2026-10-10 00:00 |
17:34:46.81 |
-46:07:12.5 |
HIP 85893 |
20.37 |
| 2026-10-10 12:00 |
17:34:48.87 |
-46:06:59.4 |
HIP 85893 |
20.54 |
| 2026-10-11 00:00 |
17:34:50.96 |
-46:06:46.4 |
HIP 85893 |
20.73 |