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) |
| 2026-09-25 00:00 |
17:58:16.12 |
-13:18:12.5 |
HIP 88010 |
13.65 |
| 2026-09-25 12:00 |
17:58:21.36 |
-13:18:58.4 |
HIP 88010 |
13.91 |
| 2026-09-26 00:00 |
17:58:26.75 |
-13:19:44.2 |
HIP 88010 |
14.32 |
| 2026-09-26 12:00 |
17:58:32.28 |
-13:20:29.9 |
HIP 88010 |
14.86 |
| 2026-09-27 00:00 |
17:58:37.96 |
-13:21:15.4 |
HIP 88010 |
15.54 |
| 2026-09-27 12:00 |
17:58:43.79 |
-13:22:00.7 |
HIP 88010 |
16.34 |
| 2026-09-28 00:00 |
17:58:49.76 |
-13:22:45.9 |
HIP 88010 |
17.25 |
| 2026-09-28 12:00 |
17:58:55.88 |
-13:23:30.9 |
HIP 88010 |
18.28 |
| 2026-09-29 00:00 |
17:59:02.14 |
-13:24:15.7 |
HIP 88010 |
19.40 |
| 2026-09-29 12:00 |
17:59:08.54 |
-13:25:00.4 |
HIP 88010 |
20.60 |
| 2026-09-30 00:00 |
17:59:15.08 |
-13:25:44.8 |
HIP 88010 |
21.89 |
| 2026-09-30 12:00 |
17:59:21.77 |
-13:26:29.1 |
HIP 88010 |
23.26 |
| 2026-10-01 00:00 |
17:59:28.60 |
-13:27:13.3 |
HIP 88010 |
24.69 |
| 2026-10-01 12:00 |
17:59:35.57 |
-13:27:57.2 |
HIP 88201 |
25.08 |
| 2026-10-02 00:00 |
17:59:42.67 |
-13:28:40.9 |
HIP 88201 |
23.40 |
| 2026-10-02 12:00 |
17:59:49.92 |
-13:29:24.5 |
HIP 88201 |
21.75 |
| 2026-10-03 00:00 |
17:59:57.31 |
-13:30:07.9 |
HIP 88201 |
20.12 |
| 2026-10-03 12:00 |
18:00:04.83 |
-13:30:51.0 |
HIP 88201 |
18.53 |
| 2026-10-04 00:00 |
18:00:12.49 |
-13:31:34.0 |
HIP 88201 |
17.02 |
| 2026-10-04 12:00 |
18:00:20.29 |
-13:32:16.7 |
HIP 88201 |
15.60 |
| 2026-10-05 00:00 |
18:00:28.23 |
-13:32:59.3 |
HIP 88201 |
14.32 |
| 2026-10-05 12:00 |
18:00:36.30 |
-13:33:41.6 |
HIP 88201 |
13.24 |
| 2026-10-06 00:00 |
18:00:44.51 |
-13:34:23.7 |
HIP 88201 |
12.42 |
| 2026-10-06 12:00 |
18:00:52.85 |
-13:35:05.6 |
HIP 88201 |
11.93 |
| 2026-10-07 00:00 |
18:01:01.32 |
-13:35:47.3 |
HIP 88201 |
11.83 |
| 2026-10-07 12:00 |
18:01:09.93 |
-13:36:28.8 |
HIP 88201 |
12.15 |
| 2026-10-08 00:00 |
18:01:18.67 |
-13:37:10.0 |
HIP 88201 |
12.87 |
| 2026-10-08 12:00 |
18:01:27.55 |
-13:37:51.0 |
HIP 88201 |
13.94 |
| 2026-10-09 00:00 |
18:01:36.55 |
-13:38:31.8 |
HIP 88201 |
15.30 |
| 2026-10-09 12:00 |
18:01:45.68 |
-13:39:12.3 |
HIP 88201 |
16.89 |
| 2026-10-10 00:00 |
18:01:54.95 |
-13:39:52.6 |
HIP 88201 |
18.67 |
| 2026-10-10 12:00 |
18:02:04.34 |
-13:40:32.6 |
HIP 88201 |
20.59 |
| 2026-10-11 00:00 |
18:02:13.86 |
-13:41:12.4 |
HIP 88201 |
22.63 |
| 2026-10-11 12:00 |
18:02:23.51 |
-13:41:51.9 |
HIP 88201 |
24.76 |
| 2026-10-12 00:00 |
18:02:33.28 |
-13:42:31.2 |
HIP 88201 |
26.98 |
| 2026-10-12 12:00 |
18:02:43.18 |
-13:43:10.2 |
HIP 88201 |
29.27 |
| 2026-10-13 00:00 |
18:02:53.21 |
-13:43:49.0 |
HIP 88201 |
31.62 |
| 2026-10-13 12:00 |
18:03:03.36 |
-13:44:27.5 |
HIP 88201 |
34.02 |
| 2026-10-14 00:00 |
18:03:13.63 |
-13:45:05.7 |
HIP 88201 |
36.47 |
| 2026-10-14 12:00 |
18:03:24.02 |
-13:45:43.6 |
HIP 88201 |
38.97 |
| 2026-10-15 00:00 |
18:03:34.54 |
-13:46:21.3 |
HIP 88201 |
41.51 |
| 2026-10-15 12:00 |
18:03:45.17 |
-13:46:58.7 |
HIP 88652 |
40.88 |
| 2026-10-16 00:00 |
18:03:55.93 |
-13:47:35.9 |
HIP 88652 |
38.45 |