207P/NEAT
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 |
-7.5803 |
+2.112 |
| 2023-11-08 |
2023-11-27 |
+6.0478 |
-0.368 |
| 2023-11-27 |
2024-01-31 |
+9.0520 |
-0.573 |
| 2024-02-01 |
2024-03-24 |
-1.2445 |
+0.237 |
| 2024-03-24 |
2024-05-05 |
-6.8598 |
+0.180 |
| 2024-05-05 |
2024-05-29 |
+11.8150 |
-3.543 |
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) |
| 2026-02-03 00:00 |
18:27:11.12 |
-14:40:48.7 |
HIP 90299 |
24.55 |
| 2026-02-03 12:00 |
18:27:30.18 |
-14:40:06.9 |
HIP 90595 |
25.36 |
| 2026-02-04 00:00 |
18:27:49.16 |
-14:39:24.8 |
HIP 90595 |
20.74 |
| 2026-02-04 12:00 |
18:28:08.05 |
-14:38:42.4 |
HIP 90595 |
16.15 |
| 2026-02-05 00:00 |
18:28:26.85 |
-14:37:59.6 |
HIP 90595 |
11.61 |
| 2026-02-05 12:00 |
18:28:45.57 |
-14:37:16.5 |
HIP 90595 |
7.18 |
| 2026-02-06 00:00 |
18:29:04.20 |
-14:36:33.0 |
HIP 90595 |
3.19 |
| 2026-02-06 12:00 |
18:29:22.74 |
-14:35:49.2 |
HIP 90595 |
3.23 |
| 2026-02-07 00:00 |
18:29:41.19 |
-14:35:05.0 |
HIP 90651 |
1.35 |
| 2026-02-07 12:00 |
18:29:59.55 |
-14:34:20.5 |
HIP 90651 |
3.15 |
| 2026-02-08 00:00 |
18:30:17.82 |
-14:33:35.7 |
HIP 90651 |
7.63 |
| 2026-02-08 12:00 |
18:30:36.00 |
-14:32:50.5 |
HIP 90651 |
12.10 |
| 2026-02-09 00:00 |
18:30:54.08 |
-14:32:05.0 |
HIP 90651 |
16.54 |
| 2026-02-09 12:00 |
18:31:12.07 |
-14:31:19.2 |
HIP 90884 |
18.14 |
| 2026-02-10 00:00 |
18:31:29.97 |
-14:30:33.1 |
HIP 90884 |
14.70 |
| 2026-02-10 12:00 |
18:31:47.77 |
-14:29:46.6 |
HIP 90884 |
11.92 |
| 2026-02-11 00:00 |
18:32:05.48 |
-14:28:59.8 |
HIP 90884 |
10.33 |
| 2026-02-11 12:00 |
18:32:23.09 |
-14:28:12.7 |
HIP 90884 |
10.46 |
| 2026-02-12 00:00 |
18:32:40.60 |
-14:27:25.3 |
HIP 90884 |
12.22 |
| 2026-02-12 12:00 |
18:32:58.01 |
-14:26:37.6 |
HIP 91001 |
12.83 |
| 2026-02-13 00:00 |
18:33:15.32 |
-14:25:49.6 |
HIP 91001 |
8.60 |
| 2026-02-13 12:00 |
18:33:32.53 |
-14:25:01.3 |
HIP 91001 |
4.45 |
| 2026-02-14 00:00 |
18:33:49.64 |
-14:24:12.7 |
HIP 91001 |
1.36 |
| 2026-02-14 12:00 |
18:34:06.65 |
-14:23:23.8 |
HIP 91001 |
4.40 |
| 2026-02-15 00:00 |
18:34:23.55 |
-14:22:34.6 |
HIP 91001 |
8.47 |
| 2026-02-15 12:00 |
18:34:40.35 |
-14:21:45.1 |
HIP 91068 |
12.48 |
| 2026-02-16 00:00 |
18:34:57.04 |
-14:20:55.3 |
HIP 91068 |
14.39 |
| 2026-02-16 12:00 |
18:35:13.63 |
-14:20:05.3 |
HIP 91068 |
17.10 |
| 2026-02-17 00:00 |
18:35:30.11 |
-14:19:14.9 |
HIP 91174 |
16.96 |
| 2026-02-17 12:00 |
18:35:46.48 |
-14:18:24.3 |
HIP 91174 |
14.85 |
| 2026-02-18 00:00 |
18:36:02.75 |
-14:17:33.5 |
HIP 91174 |
13.64 |
| 2026-02-18 12:00 |
18:36:18.90 |
-14:16:42.3 |
HIP 91174 |
13.56 |
| 2026-02-19 00:00 |
18:36:34.95 |
-14:15:50.9 |
HIP 91174 |
14.60 |
| 2026-02-19 12:00 |
18:36:50.88 |
-14:14:59.3 |
HIP 91174 |
16.54 |
| 2026-02-20 00:00 |
18:37:06.70 |
-14:14:07.4 |
HIP 91174 |
19.08 |
| 2026-02-20 12:00 |
18:37:22.41 |
-14:13:15.2 |
HIP 91369 |
16.50 |
| 2026-02-21 00:00 |
18:37:38.01 |
-14:12:22.8 |
HIP 91369 |
13.69 |
| 2026-02-21 12:00 |
18:37:53.49 |
-14:11:30.2 |
HIP 91369 |
11.53 |
| 2026-02-22 00:00 |
18:38:08.85 |
-14:10:37.3 |
HIP 91369 |
10.39 |
| 2026-02-22 12:00 |
18:38:24.10 |
-14:09:44.1 |
HIP 91369 |
10.58 |
| 2026-02-23 00:00 |
18:38:39.23 |
-14:08:50.8 |
HIP 91369 |
12.01 |
| 2026-02-23 12:00 |
18:38:54.24 |
-14:07:57.2 |
HIP 91369 |
14.30 |
| 2026-02-24 00:00 |
18:39:09.14 |
-14:07:03.4 |
HIP 91477 |
16.78 |