C/2001 B2 (NEAT)
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) |
| 2026-02-03 00:00 |
03:16:35.70 |
+48:39:21.5 |
HIP 15114 |
16.74 |
| 2026-02-03 12:00 |
03:16:34.87 |
+48:38:58.7 |
HIP 15114 |
16.67 |
| 2026-02-04 00:00 |
03:16:34.06 |
+48:38:36.0 |
HIP 15114 |
16.61 |
| 2026-02-04 12:00 |
03:16:33.30 |
+48:38:13.4 |
HIP 15114 |
16.56 |
| 2026-02-05 00:00 |
03:16:32.57 |
+48:37:50.8 |
HIP 15114 |
16.53 |
| 2026-02-05 12:00 |
03:16:31.87 |
+48:37:28.4 |
HIP 15114 |
16.51 |
| 2026-02-06 00:00 |
03:16:31.21 |
+48:37:05.9 |
HIP 15114 |
16.51 |
| 2026-02-06 12:00 |
03:16:30.59 |
+48:36:43.6 |
HIP 15114 |
16.52 |
| 2026-02-07 00:00 |
03:16:30.00 |
+48:36:21.3 |
HIP 15114 |
16.54 |
| 2026-02-07 12:00 |
03:16:29.44 |
+48:35:59.1 |
HIP 15114 |
16.58 |
| 2026-02-08 00:00 |
03:16:28.92 |
+48:35:37.0 |
HIP 15114 |
16.63 |
| 2026-02-08 12:00 |
03:16:28.43 |
+48:35:15.0 |
HIP 15114 |
16.70 |
| 2026-02-09 00:00 |
03:16:27.99 |
+48:34:53.0 |
HIP 15114 |
16.78 |
| 2026-02-09 12:00 |
03:16:27.57 |
+48:34:31.2 |
HIP 15114 |
16.87 |
| 2026-02-10 00:00 |
03:16:27.19 |
+48:34:09.4 |
HIP 15114 |
16.97 |
| 2026-02-10 12:00 |
03:16:26.85 |
+48:33:47.7 |
HIP 15114 |
17.09 |
| 2026-02-11 00:00 |
03:16:26.54 |
+48:33:26.1 |
HIP 15114 |
17.21 |
| 2026-02-11 12:00 |
03:16:26.26 |
+48:33:04.5 |
HIP 15114 |
17.35 |
| 2026-02-12 00:00 |
03:16:26.02 |
+48:32:43.1 |
HIP 15114 |
17.50 |
| 2026-02-12 12:00 |
03:16:25.82 |
+48:32:21.8 |
HIP 15114 |
17.66 |
| 2026-02-13 00:00 |
03:16:25.65 |
+48:32:00.5 |
HIP 15114 |
17.83 |
| 2026-02-13 12:00 |
03:16:25.52 |
+48:31:39.4 |
HIP 15114 |
18.00 |
| 2026-02-14 00:00 |
03:16:25.42 |
+48:31:18.3 |
HIP 15114 |
18.19 |
| 2026-02-14 12:00 |
03:16:25.35 |
+48:30:57.4 |
HIP 15114 |
18.38 |
| 2026-02-15 00:00 |
03:16:25.32 |
+48:30:36.6 |
HIP 15114 |
18.59 |
| 2026-02-15 12:00 |
03:16:25.33 |
+48:30:15.8 |
HIP 15114 |
18.80 |
| 2026-02-16 00:00 |
03:16:25.37 |
+48:29:55.2 |
HIP 15114 |
19.02 |
| 2026-02-16 12:00 |
03:16:25.44 |
+48:29:34.6 |
HIP 15114 |
19.24 |
| 2026-02-17 00:00 |
03:16:25.55 |
+48:29:14.2 |
HIP 15114 |
19.47 |
| 2026-02-17 12:00 |
03:16:25.69 |
+48:28:53.9 |
HIP 15114 |
19.71 |
| 2026-02-18 00:00 |
03:16:25.87 |
+48:28:33.7 |
HIP 15114 |
19.95 |
| 2026-02-18 12:00 |
03:16:26.08 |
+48:28:13.6 |
HIP 15114 |
20.20 |
| 2026-02-19 00:00 |
03:16:26.33 |
+48:27:53.6 |
HIP 15114 |
20.46 |
| 2026-02-19 12:00 |
03:16:26.61 |
+48:27:33.8 |
HIP 15261 |
20.22 |
| 2026-02-20 00:00 |
03:16:26.93 |
+48:27:14.0 |
HIP 15261 |
19.88 |
| 2026-02-20 12:00 |
03:16:27.27 |
+48:26:54.4 |
HIP 15261 |
19.55 |
| 2026-02-21 00:00 |
03:16:27.66 |
+48:26:34.9 |
HIP 15261 |
19.22 |
| 2026-02-21 12:00 |
03:16:28.07 |
+48:26:15.5 |
HIP 15261 |
18.89 |
| 2026-02-22 00:00 |
03:16:28.52 |
+48:25:56.2 |
HIP 15261 |
18.56 |
| 2026-02-22 12:00 |
03:16:29.01 |
+48:25:37.1 |
HIP 15261 |
18.23 |
| 2026-02-23 00:00 |
03:16:29.52 |
+48:25:18.0 |
HIP 15261 |
17.90 |
| 2026-02-23 12:00 |
03:16:30.07 |
+48:24:59.1 |
HIP 15261 |
17.58 |
| 2026-02-24 00:00 |
03:16:30.66 |
+48:24:40.4 |
HIP 15261 |
17.25 |