メタデータ
| 項目 |
値 |
| Designation |
207P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-01-31T21:10:31.765440Z |
| Orbit solution date (soln_date, UTC) |
2024-07-13T19:12:21Z |
| Obs used |
945 |
| NEO |
Yes |
| M1 |
18.100 |
| K1 |
7.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-09-21.0000000 |
| e |
0.75913663 |
| q (au) |
0.932526 |
| a (au) |
3.871595 |
| i (deg) |
10.186368 |
| Ω (om, deg) |
198.342590 |
| ω (w, deg) |
272.996482 |
| M (ma, deg) |
248.359775 |
等級
散乱 + 全体線形
$$
M_a = (17.808 + 4.847\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.808 |
| n |
4.847 |
| gf |
1.000 |
| gb |
-0.660 |
| k |
0.889 |
| δ90 |
10.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2023-08-14 |
2023-11-08 |
-7.5789 |
+2.111 |
| 2023-11-08 |
2023-11-27 |
+6.0464 |
-0.368 |
| 2023-11-27 |
2024-01-31 |
+9.0520 |
-0.573 |
| 2024-02-01 |
2024-03-24 |
-1.1487 |
+0.236 |
| 2024-03-24 |
2024-05-03 |
-7.4634 |
+0.253 |
| 2024-05-03 |
2024-05-29 |
+14.8610 |
-4.201 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:06:22.59 |
-11:49:18.4 |
HIP 88719 |
21.16 |
| 2026-07-29 12:00 |
18:06:09.34 |
-11:49:55.3 |
HIP 88719 |
22.82 |
| 2026-07-30 00:00 |
18:05:56.23 |
-11:50:32.4 |
HIP 88719 |
24.79 |
| 2026-07-30 12:00 |
18:05:43.25 |
-11:51:09.8 |
HIP 88719 |
27.00 |
| 2026-07-31 00:00 |
18:05:30.40 |
-11:51:47.6 |
HIP 88719 |
29.39 |
| 2026-07-31 12:00 |
18:05:17.69 |
-11:52:25.7 |
HIP 88668 |
31.06 |
| 2026-08-01 00:00 |
18:05:05.12 |
-11:53:04.0 |
HIP 88668 |
31.81 |
| 2026-08-01 12:00 |
18:04:52.68 |
-11:53:42.7 |
HIP 88668 |
32.82 |
| 2026-08-02 00:00 |
18:04:40.39 |
-11:54:21.6 |
HIP 88668 |
34.05 |
| 2026-08-02 12:00 |
18:04:28.23 |
-11:55:00.9 |
HIP 88668 |
35.48 |
| 2026-08-03 00:00 |
18:04:16.22 |
-11:55:40.4 |
HIP 88326 |
36.40 |
| 2026-08-03 12:00 |
18:04:04.35 |
-11:56:20.2 |
HIP 88326 |
33.78 |
| 2026-08-04 00:00 |
18:03:52.63 |
-11:57:00.3 |
HIP 88326 |
31.25 |
| 2026-08-04 12:00 |
18:03:41.04 |
-11:57:40.6 |
HIP 88326 |
28.81 |
| 2026-08-05 00:00 |
18:03:29.61 |
-11:58:21.3 |
HIP 88326 |
26.49 |
| 2026-08-05 12:00 |
18:03:18.32 |
-11:59:02.2 |
HIP 88326 |
24.30 |
| 2026-08-06 00:00 |
18:03:07.18 |
-11:59:43.3 |
HIP 88326 |
22.28 |
| 2026-08-06 12:00 |
18:02:56.19 |
-12:00:24.7 |
HIP 88326 |
20.45 |
| 2026-08-07 00:00 |
18:02:45.35 |
-12:01:06.4 |
HIP 88326 |
18.86 |
| 2026-08-07 12:00 |
18:02:34.66 |
-12:01:48.3 |
HIP 88326 |
17.56 |
| 2026-08-08 00:00 |
18:02:24.12 |
-12:02:30.5 |
HIP 88326 |
16.60 |
| 2026-08-08 12:00 |
18:02:13.73 |
-12:03:12.9 |
HIP 88326 |
16.02 |
| 2026-08-09 00:00 |
18:02:03.50 |
-12:03:55.6 |
HIP 88326 |
15.85 |
| 2026-08-09 12:00 |
18:01:53.42 |
-12:04:38.5 |
HIP 88326 |
16.08 |
| 2026-08-10 00:00 |
18:01:43.50 |
-12:05:21.6 |
HIP 88326 |
16.69 |
| 2026-08-10 12:00 |
18:01:33.74 |
-12:06:05.0 |
HIP 88326 |
17.61 |
| 2026-08-11 00:00 |
18:01:24.13 |
-12:06:48.6 |
HIP 88326 |
18.78 |
| 2026-08-11 12:00 |
18:01:14.68 |
-12:07:32.4 |
HIP 88326 |
20.15 |
| 2026-08-12 00:00 |
18:01:05.39 |
-12:08:16.4 |
HIP 88117 |
18.88 |
| 2026-08-12 12:00 |
18:00:56.26 |
-12:09:00.6 |
HIP 88117 |
16.63 |
| 2026-08-13 00:00 |
18:00:47.29 |
-12:09:45.0 |
HIP 88117 |
14.45 |
| 2026-08-13 12:00 |
18:00:38.48 |
-12:10:29.6 |
HIP 88117 |
12.37 |
| 2026-08-14 00:00 |
18:00:29.84 |
-12:11:14.4 |
HIP 88117 |
10.40 |
| 2026-08-14 12:00 |
18:00:21.36 |
-12:11:59.4 |
HIP 88117 |
8.61 |
| 2026-08-15 00:00 |
18:00:13.04 |
-12:12:44.6 |
HIP 88117 |
7.10 |
| 2026-08-15 12:00 |
18:00:04.88 |
-12:13:30.0 |
HIP 88117 |
6.03 |
| 2026-08-16 00:00 |
17:59:56.89 |
-12:14:15.5 |
HIP 88117 |
5.62 |
| 2026-08-16 12:00 |
17:59:49.06 |
-12:15:01.2 |
HIP 88117 |
5.98 |
| 2026-08-17 00:00 |
17:59:41.40 |
-12:15:47.1 |
HIP 88117 |
6.94 |
| 2026-08-17 12:00 |
17:59:33.91 |
-12:16:33.1 |
HIP 88117 |
8.28 |
| 2026-08-18 00:00 |
17:59:26.57 |
-12:17:19.3 |
HIP 88117 |
9.82 |
| 2026-08-18 12:00 |
17:59:19.41 |
-12:18:05.7 |
HIP 88117 |
11.46 |
| 2026-08-19 00:00 |
17:59:12.41 |
-12:18:52.1 |
HIP 88117 |
13.15 |