メタデータ
| 項目 |
値 |
| Designation |
C/2005 O1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-05-17T08:50:22.372800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
90 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
17.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-08-12.0000000 |
| e |
0.92959218 |
| q (au) |
3.590926 |
| a (au) |
51.001801 |
| i (deg) |
155.981032 |
| Ω (om, deg) |
304.799007 |
| ω (w, deg) |
324.741971 |
| M (ma, deg) |
0.234424 |
等級
散乱 + 全体線形
$$
M_a = (11.819 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.819 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.760 |
| k |
0.800 |
| 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 |
12:56:33.14 |
+17:04:11.2 |
HIP 63107 |
15.19 |
| 2026-07-29 12:00 |
12:56:34.01 |
+17:03:48.2 |
HIP 63107 |
15.03 |
| 2026-07-30 00:00 |
12:56:34.91 |
+17:03:25.1 |
HIP 63107 |
14.89 |
| 2026-07-30 12:00 |
12:56:35.83 |
+17:03:02.0 |
HIP 63107 |
14.76 |
| 2026-07-31 00:00 |
12:56:36.77 |
+17:02:38.8 |
HIP 63107 |
14.65 |
| 2026-07-31 12:00 |
12:56:37.74 |
+17:02:15.5 |
HIP 63107 |
14.56 |
| 2026-08-01 00:00 |
12:56:38.73 |
+17:01:52.2 |
HIP 63107 |
14.48 |
| 2026-08-01 12:00 |
12:56:39.74 |
+17:01:28.8 |
HIP 63107 |
14.42 |
| 2026-08-02 00:00 |
12:56:40.78 |
+17:01:05.4 |
HIP 63107 |
14.38 |
| 2026-08-02 12:00 |
12:56:41.84 |
+17:00:41.9 |
HIP 63107 |
14.36 |
| 2026-08-03 00:00 |
12:56:42.93 |
+17:00:18.4 |
HIP 63107 |
14.36 |
| 2026-08-03 12:00 |
12:56:44.04 |
+16:59:54.8 |
HIP 63107 |
14.37 |
| 2026-08-04 00:00 |
12:56:45.17 |
+16:59:31.1 |
HIP 63107 |
14.41 |
| 2026-08-04 12:00 |
12:56:46.32 |
+16:59:07.4 |
HIP 63107 |
14.47 |
| 2026-08-05 00:00 |
12:56:47.50 |
+16:58:43.6 |
HIP 63107 |
14.54 |
| 2026-08-05 12:00 |
12:56:48.70 |
+16:58:19.8 |
HIP 63107 |
14.64 |
| 2026-08-06 00:00 |
12:56:49.92 |
+16:57:56.0 |
HIP 63107 |
14.76 |
| 2026-08-06 12:00 |
12:56:51.17 |
+16:57:32.0 |
HIP 63107 |
14.90 |
| 2026-08-07 00:00 |
12:56:52.43 |
+16:57:08.1 |
HIP 63107 |
15.06 |
| 2026-08-07 12:00 |
12:56:53.72 |
+16:56:44.1 |
HIP 63107 |
15.24 |
| 2026-08-08 00:00 |
12:56:55.04 |
+16:56:20.1 |
HIP 63107 |
15.43 |
| 2026-08-08 12:00 |
12:56:56.37 |
+16:55:56.0 |
HIP 63107 |
15.65 |
| 2026-08-09 00:00 |
12:56:57.73 |
+16:55:31.9 |
HIP 63107 |
15.89 |
| 2026-08-09 12:00 |
12:56:59.11 |
+16:55:07.8 |
HIP 63107 |
16.14 |
| 2026-08-10 00:00 |
12:57:00.51 |
+16:54:43.6 |
HIP 63107 |
16.41 |
| 2026-08-10 12:00 |
12:57:01.93 |
+16:54:19.4 |
HIP 63107 |
16.70 |
| 2026-08-11 00:00 |
12:57:03.37 |
+16:53:55.2 |
HIP 63107 |
17.01 |
| 2026-08-11 12:00 |
12:57:04.84 |
+16:53:30.9 |
HIP 63107 |
17.33 |
| 2026-08-12 00:00 |
12:57:06.33 |
+16:53:06.6 |
HIP 63107 |
17.67 |
| 2026-08-12 12:00 |
12:57:07.84 |
+16:52:42.3 |
HIP 63107 |
18.02 |
| 2026-08-13 00:00 |
12:57:09.37 |
+16:52:18.0 |
HIP 63107 |
18.39 |
| 2026-08-13 12:00 |
12:57:10.92 |
+16:51:53.6 |
HIP 63107 |
18.77 |
| 2026-08-14 00:00 |
12:57:12.49 |
+16:51:29.2 |
HIP 63107 |
19.16 |
| 2026-08-14 12:00 |
12:57:14.08 |
+16:51:04.8 |
HIP 63107 |
19.57 |
| 2026-08-15 00:00 |
12:57:15.69 |
+16:50:40.4 |
HIP 63107 |
19.98 |
| 2026-08-15 12:00 |
12:57:17.33 |
+16:50:16.0 |
HIP 63107 |
20.42 |
| 2026-08-16 00:00 |
12:57:18.98 |
+16:49:51.6 |
HIP 63107 |
20.86 |
| 2026-08-16 12:00 |
12:57:20.66 |
+16:49:27.1 |
HIP 63107 |
21.31 |
| 2026-08-17 00:00 |
12:57:22.35 |
+16:49:02.7 |
HIP 63107 |
21.77 |
| 2026-08-17 12:00 |
12:57:24.06 |
+16:48:38.2 |
HIP 63107 |
22.24 |
| 2026-08-18 00:00 |
12:57:25.80 |
+16:48:13.8 |
HIP 63107 |
22.73 |
| 2026-08-18 12:00 |
12:57:27.55 |
+16:47:49.3 |
HIP 63107 |
23.22 |
| 2026-08-19 00:00 |
12:57:29.32 |
+16:47:24.8 |
HIP 63107 |
23.72 |