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) |
| 2026-09-20 00:00 |
12:59:55.82 |
+16:22:30.1 |
HIP 63416 |
6.10 |
| 2026-09-20 12:00 |
12:59:58.51 |
+16:22:09.0 |
HIP 63416 |
6.17 |
| 2026-09-21 00:00 |
13:00:01.20 |
+16:21:48.0 |
HIP 63416 |
6.32 |
| 2026-09-21 12:00 |
13:00:03.90 |
+16:21:27.2 |
HIP 63416 |
6.56 |
| 2026-09-22 00:00 |
13:00:06.60 |
+16:21:06.4 |
HIP 63416 |
6.87 |
| 2026-09-22 12:00 |
13:00:09.32 |
+16:20:45.7 |
HIP 63416 |
7.24 |
| 2026-09-23 00:00 |
13:00:12.04 |
+16:20:25.2 |
HIP 63416 |
7.67 |
| 2026-09-23 12:00 |
13:00:14.77 |
+16:20:04.7 |
HIP 63416 |
8.15 |
| 2026-09-24 00:00 |
13:00:17.50 |
+16:19:44.4 |
HIP 63416 |
8.66 |
| 2026-09-24 12:00 |
13:00:20.24 |
+16:19:24.2 |
HIP 63416 |
9.21 |
| 2026-09-25 00:00 |
13:00:22.99 |
+16:19:04.1 |
HIP 63416 |
9.78 |
| 2026-09-25 12:00 |
13:00:25.75 |
+16:18:44.1 |
HIP 63416 |
10.38 |
| 2026-09-26 00:00 |
13:00:28.51 |
+16:18:24.2 |
HIP 63416 |
10.99 |
| 2026-09-26 12:00 |
13:00:31.27 |
+16:18:04.5 |
HIP 63416 |
11.63 |
| 2026-09-27 00:00 |
13:00:34.04 |
+16:17:44.8 |
HIP 63416 |
12.27 |
| 2026-09-27 12:00 |
13:00:36.82 |
+16:17:25.3 |
HIP 63416 |
12.93 |
| 2026-09-28 00:00 |
13:00:39.60 |
+16:17:05.9 |
HIP 63416 |
13.60 |
| 2026-09-28 12:00 |
13:00:42.39 |
+16:16:46.7 |
HIP 63416 |
14.27 |
| 2026-09-29 00:00 |
13:00:45.18 |
+16:16:27.5 |
HIP 63416 |
14.95 |
| 2026-09-29 12:00 |
13:00:47.98 |
+16:16:08.5 |
HIP 63416 |
15.64 |
| 2026-09-30 00:00 |
13:00:50.78 |
+16:15:49.6 |
HIP 63416 |
16.34 |
| 2026-09-30 12:00 |
13:00:53.58 |
+16:15:30.9 |
HIP 63416 |
17.04 |
| 2026-10-01 00:00 |
13:00:56.39 |
+16:15:12.3 |
HIP 63416 |
17.74 |
| 2026-10-01 12:00 |
13:00:59.20 |
+16:14:53.8 |
HIP 63416 |
18.45 |
| 2026-10-02 00:00 |
13:01:02.02 |
+16:14:35.4 |
HIP 63416 |
19.16 |
| 2026-10-02 12:00 |
13:01:04.84 |
+16:14:17.2 |
HIP 63416 |
19.87 |
| 2026-10-03 00:00 |
13:01:07.67 |
+16:13:59.1 |
HIP 63416 |
20.59 |
| 2026-10-03 12:00 |
13:01:10.49 |
+16:13:41.2 |
HIP 63416 |
21.31 |
| 2026-10-04 00:00 |
13:01:13.32 |
+16:13:23.4 |
HIP 63416 |
22.03 |
| 2026-10-04 12:00 |
13:01:16.16 |
+16:13:05.7 |
HIP 63416 |
22.75 |
| 2026-10-05 00:00 |
13:01:18.99 |
+16:12:48.2 |
HIP 63416 |
23.47 |
| 2026-10-05 12:00 |
13:01:21.83 |
+16:12:30.8 |
HIP 63416 |
24.20 |
| 2026-10-06 00:00 |
13:01:24.67 |
+16:12:13.5 |
HIP 63629 |
24.77 |
| 2026-10-06 12:00 |
13:01:27.51 |
+16:11:56.4 |
HIP 63629 |
24.13 |
| 2026-10-07 00:00 |
13:01:30.35 |
+16:11:39.5 |
HIP 63629 |
23.49 |
| 2026-10-07 12:00 |
13:01:33.20 |
+16:11:22.7 |
HIP 63629 |
22.86 |
| 2026-10-08 00:00 |
13:01:36.04 |
+16:11:06.1 |
HIP 63629 |
22.24 |
| 2026-10-08 12:00 |
13:01:38.89 |
+16:10:49.6 |
HIP 63629 |
21.63 |
| 2026-10-09 00:00 |
13:01:41.74 |
+16:10:33.2 |
HIP 63629 |
21.02 |
| 2026-10-09 12:00 |
13:01:44.59 |
+16:10:17.1 |
HIP 63629 |
20.43 |
| 2026-10-10 00:00 |
13:01:47.43 |
+16:10:01.0 |
HIP 63629 |
19.85 |
| 2026-10-10 12:00 |
13:01:50.28 |
+16:09:45.2 |
HIP 63629 |
19.29 |
| 2026-10-11 00:00 |
13:01:53.13 |
+16:09:29.5 |
HIP 63629 |
18.73 |