334P/NEAT
メタデータ
| 項目 |
値 |
| Designation |
334P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-05-19T03:35:22.182720Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:41Z |
| Obs used |
404 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
15.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-10-20.0000000 |
| e |
0.35453120 |
| q (au) |
4.187661 |
| a (au) |
6.487782 |
| i (deg) |
19.057080 |
| Ω (om, deg) |
92.783588 |
| ω (w, deg) |
81.094516 |
| M (ma, deg) |
216.668886 |
等級
散乱 + 全体線形
$$
M_a = (6.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.000 |
| n |
6.000 |
| gf |
0.913 |
| gb |
-0.905 |
| k |
1.000 |
| δ90 |
6.383 |
| 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 |
| 2016-01-07 |
2017-05-18 |
+13.7114 |
-8.331 |
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 |
00:07:29.45 |
-19:49:21.0 |
HIP 484 |
26.01 |
| 2026-02-03 12:00 |
00:07:40.37 |
-19:47:30.3 |
HIP 484 |
27.89 |
| 2026-02-04 00:00 |
00:07:51.34 |
-19:45:39.5 |
HIP 484 |
30.00 |
| 2026-02-04 12:00 |
00:08:02.38 |
-19:43:48.8 |
HIP 678 |
30.76 |
| 2026-02-05 00:00 |
00:08:13.47 |
-19:41:58.1 |
HIP 678 |
28.61 |
| 2026-02-05 12:00 |
00:08:24.63 |
-19:40:07.4 |
HIP 678 |
26.68 |
| 2026-02-06 00:00 |
00:08:35.84 |
-19:38:16.7 |
HIP 678 |
25.01 |
| 2026-02-06 12:00 |
00:08:47.11 |
-19:36:26.1 |
HIP 678 |
23.67 |
| 2026-02-07 00:00 |
00:08:58.43 |
-19:34:35.5 |
HIP 678 |
22.72 |
| 2026-02-07 12:00 |
00:09:09.81 |
-19:32:44.9 |
HIP 678 |
22.22 |
| 2026-02-08 00:00 |
00:09:21.25 |
-19:30:54.4 |
HIP 678 |
22.20 |
| 2026-02-08 12:00 |
00:09:32.75 |
-19:29:03.9 |
HIP 678 |
22.66 |
| 2026-02-09 00:00 |
00:09:44.29 |
-19:27:13.5 |
HIP 678 |
23.59 |
| 2026-02-09 12:00 |
00:09:55.90 |
-19:25:23.2 |
HIP 678 |
24.93 |
| 2026-02-10 00:00 |
00:10:07.55 |
-19:23:32.9 |
HIP 678 |
26.63 |
| 2026-02-10 12:00 |
00:10:19.26 |
-19:21:42.7 |
HIP 678 |
28.62 |
| 2026-02-11 00:00 |
00:10:31.03 |
-19:19:52.5 |
HIP 960 |
29.19 |
| 2026-02-11 12:00 |
00:10:42.84 |
-19:18:02.5 |
HIP 960 |
28.99 |
| 2026-02-12 00:00 |
00:10:54.71 |
-19:16:12.5 |
HIP 960 |
29.16 |
| 2026-02-12 12:00 |
00:11:06.63 |
-19:14:22.6 |
HIP 960 |
29.71 |
| 2026-02-13 00:00 |
00:11:18.59 |
-19:12:32.8 |
HIP 922 |
30.24 |
| 2026-02-13 12:00 |
00:11:30.61 |
-19:10:43.1 |
HIP 922 |
28.31 |
| 2026-02-14 00:00 |
00:11:42.68 |
-19:08:53.4 |
HIP 922 |
26.67 |
| 2026-02-14 12:00 |
00:11:54.79 |
-19:07:03.9 |
HIP 922 |
25.38 |
| 2026-02-15 00:00 |
00:12:06.96 |
-19:05:14.5 |
HIP 922 |
24.51 |
| 2026-02-15 12:00 |
00:12:19.17 |
-19:03:25.3 |
HIP 922 |
24.09 |
| 2026-02-16 00:00 |
00:12:31.43 |
-19:01:36.1 |
HIP 922 |
24.17 |
| 2026-02-16 12:00 |
00:12:43.73 |
-18:59:47.1 |
HIP 922 |
24.74 |
| 2026-02-17 00:00 |
00:12:56.08 |
-18:57:58.2 |
HIP 1170 |
24.28 |
| 2026-02-17 12:00 |
00:13:08.48 |
-18:56:09.4 |
HIP 1170 |
21.27 |
| 2026-02-18 00:00 |
00:13:20.92 |
-18:54:20.7 |
HIP 1170 |
18.40 |
| 2026-02-18 12:00 |
00:13:33.40 |
-18:52:32.3 |
HIP 1170 |
15.76 |
| 2026-02-19 00:00 |
00:13:45.93 |
-18:50:43.9 |
HIP 1170 |
13.48 |
| 2026-02-19 12:00 |
00:13:58.49 |
-18:48:55.7 |
HIP 1170 |
11.78 |
| 2026-02-20 00:00 |
00:14:11.11 |
-18:47:07.7 |
HIP 1170 |
10.95 |
| 2026-02-20 12:00 |
00:14:23.76 |
-18:45:19.8 |
HIP 1170 |
11.18 |
| 2026-02-21 00:00 |
00:14:36.45 |
-18:43:32.1 |
HIP 1170 |
12.43 |
| 2026-02-21 12:00 |
00:14:49.18 |
-18:41:44.6 |
HIP 1170 |
14.44 |
| 2026-02-22 00:00 |
00:15:01.95 |
-18:39:57.3 |
HIP 1160 |
16.22 |
| 2026-02-22 12:00 |
00:15:14.76 |
-18:38:10.1 |
HIP 1160 |
16.56 |
| 2026-02-23 00:00 |
00:15:27.61 |
-18:36:23.1 |
HIP 1160 |
17.62 |
| 2026-02-23 12:00 |
00:15:40.50 |
-18:34:36.3 |
HIP 1160 |
19.29 |
| 2026-02-24 00:00 |
00:15:53.42 |
-18:32:49.7 |
HIP 1160 |
21.43 |