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
$$
M_a = (4.024 + 4.043\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.024 |
| n |
4.043 |
| gf |
0.871 |
| gb |
-0.949 |
| k |
1.000 |
| δ90 |
4.990 |
| 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 |
03:18:01.03 |
+48:10:21.8 |
HIP 15261 |
11.81 |
| 2026-03-26 12:00 |
03:18:03.36 |
+48:10:12.4 |
HIP 15261 |
12.15 |
| 2026-03-27 00:00 |
03:18:05.71 |
+48:10:03.3 |
HIP 15261 |
12.51 |
| 2026-03-27 12:00 |
03:18:08.09 |
+48:09:54.3 |
HIP 15261 |
12.88 |
| 2026-03-28 00:00 |
03:18:10.49 |
+48:09:45.5 |
HIP 15261 |
13.25 |
| 2026-03-28 12:00 |
03:18:12.90 |
+48:09:36.8 |
HIP 15261 |
13.63 |
| 2026-03-29 00:00 |
03:18:15.34 |
+48:09:28.4 |
HIP 15261 |
14.01 |
| 2026-03-29 12:00 |
03:18:17.81 |
+48:09:20.1 |
HIP 15261 |
14.41 |
| 2026-03-30 00:00 |
03:18:20.29 |
+48:09:12.0 |
HIP 15261 |
14.81 |
| 2026-03-30 12:00 |
03:18:22.80 |
+48:09:04.0 |
HIP 15261 |
15.21 |
| 2026-03-31 00:00 |
03:18:25.32 |
+48:08:56.3 |
HIP 15261 |
15.62 |
| 2026-03-31 12:00 |
03:18:27.87 |
+48:08:48.7 |
HIP 15261 |
16.04 |
| 2026-04-01 00:00 |
03:18:30.44 |
+48:08:41.3 |
HIP 15261 |
16.46 |
| 2026-04-01 12:00 |
03:18:33.03 |
+48:08:34.1 |
HIP 15261 |
16.88 |
| 2026-04-02 00:00 |
03:18:35.64 |
+48:08:27.0 |
HIP 15497 |
16.52 |
| 2026-04-02 12:00 |
03:18:38.27 |
+48:08:20.1 |
HIP 15497 |
16.15 |
| 2026-04-03 00:00 |
03:18:40.92 |
+48:08:13.4 |
HIP 15497 |
15.77 |
| 2026-04-03 12:00 |
03:18:43.59 |
+48:08:06.9 |
HIP 15497 |
15.41 |
| 2026-04-04 00:00 |
03:18:46.27 |
+48:08:00.6 |
HIP 15497 |
15.05 |
| 2026-04-04 12:00 |
03:18:48.98 |
+48:07:54.4 |
HIP 15497 |
14.69 |
| 2026-04-05 00:00 |
03:18:51.71 |
+48:07:48.4 |
HIP 15497 |
14.34 |
| 2026-04-05 12:00 |
03:18:54.45 |
+48:07:42.6 |
HIP 15497 |
14.00 |
| 2026-04-06 00:00 |
03:18:57.22 |
+48:07:37.0 |
HIP 15497 |
13.67 |
| 2026-04-06 12:00 |
03:19:00.00 |
+48:07:31.6 |
HIP 15497 |
13.34 |
| 2026-04-07 00:00 |
03:19:02.80 |
+48:07:26.3 |
HIP 15497 |
13.03 |
| 2026-04-07 12:00 |
03:19:05.62 |
+48:07:21.2 |
HIP 15497 |
12.73 |
| 2026-04-08 00:00 |
03:19:08.46 |
+48:07:16.3 |
HIP 15497 |
12.44 |
| 2026-04-08 12:00 |
03:19:11.31 |
+48:07:11.5 |
HIP 15497 |
12.17 |
| 2026-04-09 00:00 |
03:19:14.19 |
+48:07:07.0 |
HIP 15497 |
11.90 |
| 2026-04-09 12:00 |
03:19:17.07 |
+48:07:02.6 |
HIP 15497 |
11.66 |
| 2026-04-10 00:00 |
03:19:19.98 |
+48:06:58.4 |
HIP 15497 |
11.43 |
| 2026-04-10 12:00 |
03:19:22.90 |
+48:06:54.4 |
HIP 15497 |
11.23 |
| 2026-04-11 00:00 |
03:19:25.84 |
+48:06:50.6 |
HIP 15497 |
11.04 |
| 2026-04-11 12:00 |
03:19:28.80 |
+48:06:46.9 |
HIP 15497 |
10.87 |
| 2026-04-12 00:00 |
03:19:31.77 |
+48:06:43.5 |
HIP 15497 |
10.73 |
| 2026-04-12 12:00 |
03:19:34.76 |
+48:06:40.2 |
HIP 15497 |
10.61 |
| 2026-04-13 00:00 |
03:19:37.76 |
+48:06:37.0 |
HIP 15497 |
10.52 |
| 2026-04-13 12:00 |
03:19:40.78 |
+48:06:34.1 |
HIP 15497 |
10.45 |
| 2026-04-14 00:00 |
03:19:43.81 |
+48:06:31.4 |
HIP 15497 |
10.42 |
| 2026-04-14 12:00 |
03:19:46.86 |
+48:06:28.8 |
HIP 15497 |
10.41 |
| 2026-04-15 00:00 |
03:19:49.93 |
+48:06:26.4 |
HIP 15497 |
10.42 |
| 2026-04-15 12:00 |
03:19:53.00 |
+48:06:24.2 |
HIP 15497 |
10.47 |
| 2026-04-16 00:00 |
03:19:56.10 |
+48:06:22.1 |
HIP 15497 |
10.54 |