メタデータ
| 項目 |
値 |
| Designation |
P/2001 H5 (NEAT) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2001-01-28T16:49:48.224640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
24.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2001-05-03.0000000 |
| e |
0.60019118 |
| q (au) |
2.396649 |
| a (au) |
5.994487 |
| i (deg) |
8.399268 |
| Ω (om, deg) |
329.563064 |
| ω (w, deg) |
224.878306 |
| M (ma, deg) |
6.332598 |
等級
散乱 + 全体線形
$$
M_a = (13.684 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.684 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.726 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
01:55:51.73 |
+19:24:39.0 |
HIP 9028 |
20.21 |
| 2026-03-26 12:00 |
01:56:05.49 |
+19:25:42.2 |
HIP 9028 |
18.43 |
| 2026-03-27 00:00 |
01:56:19.29 |
+19:26:45.7 |
HIP 9103 |
16.40 |
| 2026-03-27 12:00 |
01:56:33.13 |
+19:27:49.5 |
HIP 9103 |
14.77 |
| 2026-03-28 00:00 |
01:56:47.00 |
+19:28:53.7 |
HIP 9103 |
13.82 |
| 2026-03-28 12:00 |
01:57:00.92 |
+19:29:58.1 |
HIP 9103 |
13.69 |
| 2026-03-29 00:00 |
01:57:14.87 |
+19:31:02.9 |
HIP 9103 |
14.42 |
| 2026-03-29 12:00 |
01:57:28.86 |
+19:32:08.0 |
HIP 9103 |
15.90 |
| 2026-03-30 00:00 |
01:57:42.89 |
+19:33:13.4 |
HIP 9103 |
17.95 |
| 2026-03-30 12:00 |
01:57:56.95 |
+19:34:19.1 |
HIP 9103 |
20.39 |
| 2026-03-31 00:00 |
01:58:11.05 |
+19:35:25.0 |
HIP 9103 |
23.12 |
| 2026-03-31 12:00 |
01:58:25.18 |
+19:36:31.3 |
HIP 9103 |
26.04 |
| 2026-04-01 00:00 |
01:58:39.35 |
+19:37:37.9 |
HIP 9103 |
29.10 |
| 2026-04-01 12:00 |
01:58:53.55 |
+19:38:44.7 |
HIP 9103 |
32.26 |
| 2026-04-02 00:00 |
01:59:07.79 |
+19:39:51.9 |
HIP 9379 |
34.76 |
| 2026-04-02 12:00 |
01:59:22.05 |
+19:40:59.3 |
HIP 9379 |
33.94 |
| 2026-04-03 00:00 |
01:59:36.35 |
+19:42:07.0 |
HIP 9379 |
33.49 |
| 2026-04-03 12:00 |
01:59:50.68 |
+19:43:14.9 |
HIP 9379 |
33.40 |
| 2026-04-04 00:00 |
02:00:05.05 |
+19:44:23.2 |
HIP 9379 |
33.70 |
| 2026-04-04 12:00 |
02:00:19.44 |
+19:45:31.7 |
HIP 9477 |
32.74 |
| 2026-04-05 00:00 |
02:00:33.86 |
+19:46:40.5 |
HIP 9477 |
29.63 |
| 2026-04-05 12:00 |
02:00:48.32 |
+19:47:49.5 |
HIP 9477 |
26.65 |
| 2026-04-06 00:00 |
02:01:02.80 |
+19:48:58.8 |
HIP 9477 |
23.82 |
| 2026-04-06 12:00 |
02:01:17.31 |
+19:50:08.3 |
HIP 9477 |
21.21 |
| 2026-04-07 00:00 |
02:01:31.85 |
+19:51:18.1 |
HIP 9477 |
18.93 |
| 2026-04-07 12:00 |
02:01:46.42 |
+19:52:28.2 |
HIP 9477 |
17.11 |
| 2026-04-08 00:00 |
02:02:01.01 |
+19:53:38.5 |
HIP 9477 |
15.91 |
| 2026-04-08 12:00 |
02:02:15.63 |
+19:54:49.0 |
HIP 9477 |
15.48 |
| 2026-04-09 00:00 |
02:02:30.28 |
+19:55:59.8 |
HIP 9477 |
15.90 |
| 2026-04-09 12:00 |
02:02:44.95 |
+19:57:10.8 |
HIP 9477 |
17.09 |
| 2026-04-10 00:00 |
02:02:59.64 |
+19:58:22.1 |
HIP 9654 |
16.83 |
| 2026-04-10 12:00 |
02:03:14.36 |
+19:59:33.6 |
HIP 9654 |
13.99 |
| 2026-04-11 00:00 |
02:03:29.11 |
+20:00:45.3 |
HIP 9654 |
11.61 |
| 2026-04-11 12:00 |
02:03:43.88 |
+20:01:57.3 |
HIP 9654 |
10.04 |
| 2026-04-12 00:00 |
02:03:58.67 |
+20:03:09.4 |
HIP 9654 |
9.68 |
| 2026-04-12 12:00 |
02:04:13.48 |
+20:04:21.8 |
HIP 9654 |
10.67 |
| 2026-04-13 00:00 |
02:04:28.31 |
+20:05:34.4 |
HIP 9654 |
12.70 |
| 2026-04-13 12:00 |
02:04:43.17 |
+20:06:47.2 |
HIP 9654 |
15.37 |
| 2026-04-14 00:00 |
02:04:58.04 |
+20:08:00.2 |
HIP 9654 |
18.40 |
| 2026-04-14 12:00 |
02:05:12.94 |
+20:09:13.5 |
HIP 9654 |
21.64 |
| 2026-04-15 00:00 |
02:05:27.85 |
+20:10:26.9 |
HIP 9654 |
25.02 |
| 2026-04-15 12:00 |
02:05:42.79 |
+20:11:40.5 |
HIP 9815 |
25.11 |
| 2026-04-16 00:00 |
02:05:57.74 |
+20:12:54.4 |
HIP 9815 |
23.04 |