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) |
| 2026-07-29 00:00 |
03:29:39.13 |
+48:49:50.4 |
HIP 16211 |
16.21 |
| 2026-07-29 12:00 |
03:29:40.04 |
+48:50:10.8 |
HIP 16211 |
15.98 |
| 2026-07-30 00:00 |
03:29:40.93 |
+48:50:31.1 |
HIP 16211 |
15.75 |
| 2026-07-30 12:00 |
03:29:41.79 |
+48:50:51.5 |
HIP 16211 |
15.53 |
| 2026-07-31 00:00 |
03:29:42.62 |
+48:51:11.8 |
HIP 16211 |
15.31 |
| 2026-07-31 12:00 |
03:29:43.41 |
+48:51:32.1 |
HIP 16211 |
15.09 |
| 2026-08-01 00:00 |
03:29:44.18 |
+48:51:52.5 |
HIP 16211 |
14.88 |
| 2026-08-01 12:00 |
03:29:44.91 |
+48:52:12.8 |
HIP 16211 |
14.67 |
| 2026-08-02 00:00 |
03:29:45.62 |
+48:52:33.1 |
HIP 16211 |
14.46 |
| 2026-08-02 12:00 |
03:29:46.29 |
+48:52:53.3 |
HIP 16211 |
14.25 |
| 2026-08-03 00:00 |
03:29:46.93 |
+48:53:13.6 |
HIP 16211 |
14.05 |
| 2026-08-03 12:00 |
03:29:47.55 |
+48:53:33.8 |
HIP 16211 |
13.85 |
| 2026-08-04 00:00 |
03:29:48.13 |
+48:53:54.0 |
HIP 16211 |
13.66 |
| 2026-08-04 12:00 |
03:29:48.68 |
+48:54:14.2 |
HIP 16211 |
13.46 |
| 2026-08-05 00:00 |
03:29:49.19 |
+48:54:34.3 |
HIP 16211 |
13.28 |
| 2026-08-05 12:00 |
03:29:49.68 |
+48:54:54.5 |
HIP 16211 |
13.09 |
| 2026-08-06 00:00 |
03:29:50.13 |
+48:55:14.6 |
HIP 16211 |
12.91 |
| 2026-08-06 12:00 |
03:29:50.56 |
+48:55:34.6 |
HIP 16211 |
12.73 |
| 2026-08-07 00:00 |
03:29:50.95 |
+48:55:54.7 |
HIP 16211 |
12.55 |
| 2026-08-07 12:00 |
03:29:51.31 |
+48:56:14.7 |
HIP 16211 |
12.37 |
| 2026-08-08 00:00 |
03:29:51.64 |
+48:56:34.7 |
HIP 16211 |
12.20 |
| 2026-08-08 12:00 |
03:29:51.93 |
+48:56:54.6 |
HIP 16211 |
12.04 |
| 2026-08-09 00:00 |
03:29:52.19 |
+48:57:14.5 |
HIP 16211 |
11.87 |
| 2026-08-09 12:00 |
03:29:52.42 |
+48:57:34.4 |
HIP 16211 |
11.71 |
| 2026-08-10 00:00 |
03:29:52.62 |
+48:57:54.2 |
HIP 16211 |
11.55 |
| 2026-08-10 12:00 |
03:29:52.79 |
+48:58:14.0 |
HIP 16211 |
11.40 |
| 2026-08-11 00:00 |
03:29:52.92 |
+48:58:33.7 |
HIP 16211 |
11.25 |
| 2026-08-11 12:00 |
03:29:53.02 |
+48:58:53.4 |
HIP 16211 |
11.10 |
| 2026-08-12 00:00 |
03:29:53.09 |
+48:59:13.1 |
HIP 16211 |
10.96 |
| 2026-08-12 12:00 |
03:29:53.13 |
+48:59:32.7 |
HIP 16211 |
10.82 |
| 2026-08-13 00:00 |
03:29:53.13 |
+48:59:52.2 |
HIP 16211 |
10.68 |
| 2026-08-13 12:00 |
03:29:53.10 |
+49:00:11.7 |
HIP 16211 |
10.55 |
| 2026-08-14 00:00 |
03:29:53.04 |
+49:00:31.2 |
HIP 16211 |
10.42 |
| 2026-08-14 12:00 |
03:29:52.94 |
+49:00:50.6 |
HIP 16211 |
10.29 |
| 2026-08-15 00:00 |
03:29:52.81 |
+49:01:09.9 |
HIP 16211 |
10.17 |
| 2026-08-15 12:00 |
03:29:52.65 |
+49:01:29.2 |
HIP 16211 |
10.05 |
| 2026-08-16 00:00 |
03:29:52.45 |
+49:01:48.4 |
HIP 16211 |
9.94 |
| 2026-08-16 12:00 |
03:29:52.22 |
+49:02:07.6 |
HIP 16211 |
9.83 |
| 2026-08-17 00:00 |
03:29:51.96 |
+49:02:26.7 |
HIP 16211 |
9.72 |
| 2026-08-17 12:00 |
03:29:51.67 |
+49:02:45.7 |
HIP 16211 |
9.62 |
| 2026-08-18 00:00 |
03:29:51.34 |
+49:03:04.7 |
HIP 16211 |
9.52 |
| 2026-08-18 12:00 |
03:29:50.98 |
+49:03:23.6 |
HIP 16277 |
9.42 |
| 2026-08-19 00:00 |
03:29:50.58 |
+49:03:42.5 |
HIP 16277 |
9.11 |