473P/NEAT
メタデータ
| 項目 |
値 |
| Designation |
473P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2001-11-04T17:20:30.220800Z |
| Orbit solution date (soln_date, UTC) |
2024-06-30T00:42:21Z |
| Obs used |
520 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
25.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-08-01.0000000 |
| e |
0.82249544 |
| q (au) |
1.407115 |
| a (au) |
7.927206 |
| i (deg) |
56.948538 |
| Ω (om, deg) |
22.184978 |
| ω (w, deg) |
43.106501 |
| M (ma, deg) |
108.688703 |
等級
散乱 + 全体線形
$$
M_a = (14.080 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.080 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
| 2023-11-29 |
2024-05-08 |
+16.9214 |
-4.614 |
| 2024-05-08 |
2024-06-25 |
-14.5858 |
+3.980 |
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 |
13:54:29.18 |
-11:54:43.1 |
HIP 67876 |
14.00 |
| 2026-02-03 12:00 |
13:54:25.16 |
-11:55:25.2 |
HIP 67876 |
14.33 |
| 2026-02-04 00:00 |
13:54:20.97 |
-11:56:06.5 |
HIP 67876 |
14.73 |
| 2026-02-04 12:00 |
13:54:16.62 |
-11:56:47.0 |
HIP 67876 |
15.21 |
| 2026-02-05 00:00 |
13:54:12.10 |
-11:57:26.7 |
HIP 67876 |
15.75 |
| 2026-02-05 12:00 |
13:54:07.42 |
-11:58:05.6 |
HIP 67876 |
16.37 |
| 2026-02-06 00:00 |
13:54:02.58 |
-11:58:43.7 |
HIP 67876 |
17.05 |
| 2026-02-06 12:00 |
13:53:57.57 |
-11:59:21.0 |
HIP 67876 |
17.81 |
| 2026-02-07 00:00 |
13:53:52.40 |
-11:59:57.5 |
HIP 67876 |
18.62 |
| 2026-02-07 12:00 |
13:53:47.06 |
-12:00:33.2 |
HIP 67839 |
18.33 |
| 2026-02-08 00:00 |
13:53:41.56 |
-12:01:08.1 |
HIP 67839 |
17.75 |
| 2026-02-08 12:00 |
13:53:35.90 |
-12:01:42.3 |
HIP 67839 |
17.30 |
| 2026-02-09 00:00 |
13:53:30.07 |
-12:02:15.6 |
HIP 67839 |
16.99 |
| 2026-02-09 12:00 |
13:53:24.08 |
-12:02:48.1 |
HIP 67839 |
16.84 |
| 2026-02-10 00:00 |
13:53:17.92 |
-12:03:19.8 |
HIP 67839 |
16.86 |
| 2026-02-10 12:00 |
13:53:11.60 |
-12:03:50.8 |
HIP 67839 |
17.06 |
| 2026-02-11 00:00 |
13:53:05.12 |
-12:04:20.9 |
HIP 67839 |
17.45 |
| 2026-02-11 12:00 |
13:52:58.48 |
-12:04:50.2 |
HIP 67839 |
18.01 |
| 2026-02-12 00:00 |
13:52:51.67 |
-12:05:18.7 |
HIP 67839 |
18.75 |
| 2026-02-12 12:00 |
13:52:44.69 |
-12:05:46.4 |
HIP 67839 |
19.66 |
| 2026-02-13 00:00 |
13:52:37.56 |
-12:06:13.3 |
HIP 67839 |
20.71 |
| 2026-02-13 12:00 |
13:52:30.26 |
-12:06:39.4 |
HIP 67644 |
21.62 |
| 2026-02-14 00:00 |
13:52:22.80 |
-12:07:04.7 |
HIP 67644 |
20.17 |
| 2026-02-14 12:00 |
13:52:15.18 |
-12:07:29.2 |
HIP 67644 |
18.79 |
| 2026-02-15 00:00 |
13:52:07.40 |
-12:07:52.8 |
HIP 67644 |
17.49 |
| 2026-02-15 12:00 |
13:51:59.46 |
-12:08:15.7 |
HIP 67644 |
16.33 |
| 2026-02-16 00:00 |
13:51:51.35 |
-12:08:37.8 |
HIP 67644 |
15.33 |
| 2026-02-16 12:00 |
13:51:43.09 |
-12:08:59.0 |
HIP 67644 |
14.56 |
| 2026-02-17 00:00 |
13:51:34.67 |
-12:09:19.5 |
HIP 67644 |
14.05 |
| 2026-02-17 12:00 |
13:51:26.08 |
-12:09:39.1 |
HIP 67644 |
13.86 |
| 2026-02-18 00:00 |
13:51:17.34 |
-12:09:58.0 |
HIP 67644 |
14.02 |
| 2026-02-18 12:00 |
13:51:08.44 |
-12:10:16.0 |
HIP 67644 |
14.54 |
| 2026-02-19 00:00 |
13:50:59.38 |
-12:10:33.3 |
HIP 67644 |
15.38 |
| 2026-02-19 12:00 |
13:50:50.17 |
-12:10:49.7 |
HIP 67644 |
16.52 |
| 2026-02-20 00:00 |
13:50:40.80 |
-12:11:05.4 |
HIP 67644 |
17.91 |
| 2026-02-20 12:00 |
13:50:31.27 |
-12:11:20.2 |
HIP 67644 |
19.52 |
| 2026-02-21 00:00 |
13:50:21.59 |
-12:11:34.3 |
HIP 67644 |
21.30 |
| 2026-02-21 12:00 |
13:50:11.76 |
-12:11:47.6 |
HIP 67482 |
22.28 |
| 2026-02-22 00:00 |
13:50:01.77 |
-12:12:00.1 |
HIP 67482 |
21.48 |
| 2026-02-22 12:00 |
13:49:51.63 |
-12:12:11.8 |
HIP 67482 |
20.96 |
| 2026-02-23 00:00 |
13:49:41.34 |
-12:12:22.7 |
HIP 67482 |
20.73 |
| 2026-02-23 12:00 |
13:49:30.90 |
-12:12:32.8 |
HIP 67482 |
20.82 |
| 2026-02-24 00:00 |
13:49:20.31 |
-12:12:42.1 |
HIP 67482 |
21.25 |