メタデータ
| 項目 |
値 |
| Designation |
C/2001 B2 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-09-01T18:12:53.487360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
553 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
9.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2001-12-15.0000000 |
| e |
1.00174829 |
| q (au) |
5.306801 |
| a (au) |
-3035.429915 |
| i (deg) |
150.601545 |
| Ω (om, deg) |
145.094774 |
| ω (w, deg) |
304.757037 |
| M (ma, deg) |
0.002765 |
等級
散乱 + 全体線形
$$
M_a = (3.995 + 4.043\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.995 |
| n |
4.043 |
| gf |
0.880 |
| gb |
-0.949 |
| k |
1.000 |
| δ90 |
5.722 |
| 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) |
| 2026-06-01 00:00 |
03:25:07.59 |
+48:15:14.9 |
HIP 15898 |
10.05 |
| 2026-06-01 12:00 |
03:25:10.91 |
+48:15:27.8 |
HIP 15898 |
10.05 |
| 2026-06-02 00:00 |
03:25:14.22 |
+48:15:40.7 |
HIP 15898 |
10.09 |
| 2026-06-02 12:00 |
03:25:17.53 |
+48:15:53.7 |
HIP 15898 |
10.16 |
| 2026-06-03 00:00 |
03:25:20.82 |
+48:16:06.9 |
HIP 15898 |
10.26 |
| 2026-06-03 12:00 |
03:25:24.11 |
+48:16:20.2 |
HIP 16011 |
10.26 |
| 2026-06-04 00:00 |
03:25:27.38 |
+48:16:33.7 |
HIP 16011 |
9.71 |
| 2026-06-04 12:00 |
03:25:30.65 |
+48:16:47.2 |
HIP 16011 |
9.15 |
| 2026-06-05 00:00 |
03:25:33.90 |
+48:17:00.9 |
HIP 16011 |
8.61 |
| 2026-06-05 12:00 |
03:25:37.15 |
+48:17:14.7 |
HIP 16011 |
8.06 |
| 2026-06-06 00:00 |
03:25:40.38 |
+48:17:28.6 |
HIP 16011 |
7.53 |
| 2026-06-06 12:00 |
03:25:43.60 |
+48:17:42.7 |
HIP 16011 |
7.00 |
| 2026-06-07 00:00 |
03:25:46.81 |
+48:17:56.9 |
HIP 16011 |
6.48 |
| 2026-06-07 12:00 |
03:25:50.01 |
+48:18:11.1 |
HIP 16011 |
5.97 |
| 2026-06-08 00:00 |
03:25:53.20 |
+48:18:25.5 |
HIP 16011 |
5.47 |
| 2026-06-08 12:00 |
03:25:56.38 |
+48:18:40.1 |
HIP 16011 |
4.99 |
| 2026-06-09 00:00 |
03:25:59.55 |
+48:18:54.7 |
HIP 16011 |
4.54 |
| 2026-06-09 12:00 |
03:26:02.70 |
+48:19:09.4 |
HIP 16011 |
4.12 |
| 2026-06-10 00:00 |
03:26:05.84 |
+48:19:24.3 |
HIP 16011 |
3.73 |
| 2026-06-10 12:00 |
03:26:08.97 |
+48:19:39.3 |
HIP 16011 |
3.41 |
| 2026-06-11 00:00 |
03:26:12.08 |
+48:19:54.4 |
HIP 16011 |
3.15 |
| 2026-06-11 12:00 |
03:26:15.18 |
+48:20:09.6 |
HIP 16011 |
2.98 |
| 2026-06-12 00:00 |
03:26:18.27 |
+48:20:24.9 |
HIP 16011 |
2.91 |
| 2026-06-12 12:00 |
03:26:21.35 |
+48:20:40.3 |
HIP 16011 |
2.95 |
| 2026-06-13 00:00 |
03:26:24.41 |
+48:20:55.8 |
HIP 16011 |
3.09 |
| 2026-06-13 12:00 |
03:26:27.45 |
+48:21:11.4 |
HIP 16011 |
3.33 |
| 2026-06-14 00:00 |
03:26:30.49 |
+48:21:27.2 |
HIP 16011 |
3.63 |
| 2026-06-14 12:00 |
03:26:33.50 |
+48:21:43.0 |
HIP 16011 |
3.99 |
| 2026-06-15 00:00 |
03:26:36.51 |
+48:21:59.0 |
HIP 16011 |
4.39 |
| 2026-06-15 12:00 |
03:26:39.49 |
+48:22:15.0 |
HIP 16011 |
4.83 |
| 2026-06-16 00:00 |
03:26:42.47 |
+48:22:31.2 |
HIP 16011 |
5.28 |
| 2026-06-16 12:00 |
03:26:45.42 |
+48:22:47.4 |
HIP 16011 |
5.75 |
| 2026-06-17 00:00 |
03:26:48.36 |
+48:23:03.8 |
HIP 16011 |
6.23 |
| 2026-06-17 12:00 |
03:26:51.29 |
+48:23:20.2 |
HIP 16011 |
6.72 |
| 2026-06-18 00:00 |
03:26:54.20 |
+48:23:36.8 |
HIP 16011 |
7.22 |
| 2026-06-18 12:00 |
03:26:57.09 |
+48:23:53.4 |
HIP 16011 |
7.72 |
| 2026-06-19 00:00 |
03:26:59.96 |
+48:24:10.1 |
HIP 16011 |
8.23 |
| 2026-06-19 12:00 |
03:27:02.82 |
+48:24:27.0 |
HIP 16011 |
8.74 |
| 2026-06-20 00:00 |
03:27:05.66 |
+48:24:43.9 |
HIP 16011 |
9.26 |
| 2026-06-20 12:00 |
03:27:08.48 |
+48:25:00.9 |
HIP 16011 |
9.77 |
| 2026-06-21 00:00 |
03:27:11.29 |
+48:25:18.0 |
HIP 16011 |
10.28 |
| 2026-06-21 12:00 |
03:27:14.08 |
+48:25:35.2 |
HIP 16011 |
10.80 |
| 2026-06-22 00:00 |
03:27:16.85 |
+48:25:52.4 |
HIP 16011 |
11.31 |