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) |
| 2026-09-20 00:00 |
03:28:17.15 |
+49:20:25.7 |
HIP 16244 |
14.61 |
| 2026-09-20 12:00 |
03:28:14.66 |
+49:20:37.2 |
HIP 16244 |
14.78 |
| 2026-09-21 00:00 |
03:28:12.14 |
+49:20:48.6 |
HIP 16244 |
14.96 |
| 2026-09-21 12:00 |
03:28:09.60 |
+49:20:59.8 |
HIP 16244 |
15.16 |
| 2026-09-22 00:00 |
03:28:07.02 |
+49:21:10.9 |
HIP 16244 |
15.37 |
| 2026-09-22 12:00 |
03:28:04.42 |
+49:21:21.8 |
HIP 16118 |
15.21 |
| 2026-09-23 00:00 |
03:28:01.79 |
+49:21:32.6 |
HIP 16118 |
14.92 |
| 2026-09-23 12:00 |
03:27:59.12 |
+49:21:43.1 |
HIP 16118 |
14.65 |
| 2026-09-24 00:00 |
03:27:56.43 |
+49:21:53.6 |
HIP 16118 |
14.39 |
| 2026-09-24 12:00 |
03:27:53.72 |
+49:22:03.8 |
HIP 16118 |
14.14 |
| 2026-09-25 00:00 |
03:27:50.97 |
+49:22:13.9 |
HIP 16118 |
13.90 |
| 2026-09-25 12:00 |
03:27:48.20 |
+49:22:23.9 |
HIP 16118 |
13.68 |
| 2026-09-26 00:00 |
03:27:45.40 |
+49:22:33.6 |
HIP 16118 |
13.48 |
| 2026-09-26 12:00 |
03:27:42.57 |
+49:22:43.2 |
HIP 16118 |
13.29 |
| 2026-09-27 00:00 |
03:27:39.71 |
+49:22:52.7 |
HIP 16118 |
13.12 |
| 2026-09-27 12:00 |
03:27:36.83 |
+49:23:01.9 |
HIP 16118 |
12.97 |
| 2026-09-28 00:00 |
03:27:33.92 |
+49:23:11.0 |
HIP 16118 |
12.84 |
| 2026-09-28 12:00 |
03:27:30.98 |
+49:23:19.9 |
HIP 16118 |
12.73 |
| 2026-09-29 00:00 |
03:27:28.02 |
+49:23:28.7 |
HIP 16118 |
12.65 |
| 2026-09-29 12:00 |
03:27:25.03 |
+49:23:37.3 |
HIP 16118 |
12.58 |
| 2026-09-30 00:00 |
03:27:22.01 |
+49:23:45.7 |
HIP 16118 |
12.54 |
| 2026-09-30 12:00 |
03:27:18.97 |
+49:23:53.9 |
HIP 16118 |
12.53 |
| 2026-10-01 00:00 |
03:27:15.90 |
+49:24:02.0 |
HIP 16118 |
12.54 |
| 2026-10-01 12:00 |
03:27:12.80 |
+49:24:09.9 |
HIP 16118 |
12.57 |
| 2026-10-02 00:00 |
03:27:09.68 |
+49:24:17.6 |
HIP 16118 |
12.63 |
| 2026-10-02 12:00 |
03:27:06.54 |
+49:24:25.1 |
HIP 16118 |
12.72 |
| 2026-10-03 00:00 |
03:27:03.37 |
+49:24:32.5 |
HIP 16118 |
12.83 |
| 2026-10-03 12:00 |
03:27:00.17 |
+49:24:39.6 |
HIP 16118 |
12.97 |
| 2026-10-04 00:00 |
03:26:56.95 |
+49:24:46.6 |
HIP 16118 |
13.13 |
| 2026-10-04 12:00 |
03:26:53.70 |
+49:24:53.4 |
HIP 16118 |
13.32 |
| 2026-10-05 00:00 |
03:26:50.43 |
+49:25:00.0 |
HIP 16118 |
13.53 |
| 2026-10-05 12:00 |
03:26:47.14 |
+49:25:06.5 |
HIP 16118 |
13.76 |
| 2026-10-06 00:00 |
03:26:43.82 |
+49:25:12.7 |
HIP 16118 |
14.02 |
| 2026-10-06 12:00 |
03:26:40.48 |
+49:25:18.8 |
HIP 16118 |
14.29 |
| 2026-10-07 00:00 |
03:26:37.11 |
+49:25:24.7 |
HIP 16118 |
14.59 |
| 2026-10-07 12:00 |
03:26:33.72 |
+49:25:30.4 |
HIP 16118 |
14.91 |
| 2026-10-08 00:00 |
03:26:30.31 |
+49:25:35.9 |
HIP 16118 |
15.24 |
| 2026-10-08 12:00 |
03:26:26.87 |
+49:25:41.2 |
HIP 16118 |
15.60 |
| 2026-10-09 00:00 |
03:26:23.41 |
+49:25:46.4 |
HIP 16118 |
15.97 |
| 2026-10-09 12:00 |
03:26:19.93 |
+49:25:51.3 |
HIP 16118 |
16.35 |
| 2026-10-10 00:00 |
03:26:16.43 |
+49:25:56.0 |
HIP 16118 |
16.75 |
| 2026-10-10 12:00 |
03:26:12.91 |
+49:26:00.6 |
HIP 16118 |
17.17 |
| 2026-10-11 00:00 |
03:26:09.36 |
+49:26:05.0 |
HIP 16118 |
17.60 |