メタデータ
| 項目 |
値 |
| Designation |
C/2009 B2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-03-07T09:25:59.010240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:28Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-03-11.0000000 |
| e |
0.94428145 |
| q (au) |
2.327612 |
| a (au) |
41.774447 |
| i (deg) |
156.872979 |
| Ω (om, deg) |
18.814641 |
| ω (w, deg) |
192.495776 |
| M (ma, deg) |
0.013167 |
等級
散乱 + 全体線形
$$
M_a = (14.370 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.370 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.916 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
02:01:31.41 |
+07:16:28.5 |
HIP 9355 |
28.96 |
| 2026-09-20 12:00 |
02:01:28.20 |
+07:16:09.8 |
HIP 9355 |
28.19 |
| 2026-09-21 00:00 |
02:01:24.98 |
+07:15:51.1 |
HIP 9355 |
27.43 |
| 2026-09-21 12:00 |
02:01:21.74 |
+07:15:32.3 |
HIP 9355 |
26.67 |
| 2026-09-22 00:00 |
02:01:18.48 |
+07:15:13.5 |
HIP 9355 |
25.92 |
| 2026-09-22 12:00 |
02:01:15.20 |
+07:14:54.6 |
HIP 9355 |
25.16 |
| 2026-09-23 00:00 |
02:01:11.91 |
+07:14:35.6 |
HIP 9355 |
24.42 |
| 2026-09-23 12:00 |
02:01:08.60 |
+07:14:16.6 |
HIP 9355 |
23.67 |
| 2026-09-24 00:00 |
02:01:05.27 |
+07:13:57.5 |
HIP 9355 |
22.94 |
| 2026-09-24 12:00 |
02:01:01.93 |
+07:13:38.4 |
HIP 9355 |
22.21 |
| 2026-09-25 00:00 |
02:00:58.57 |
+07:13:19.2 |
HIP 9355 |
21.49 |
| 2026-09-25 12:00 |
02:00:55.19 |
+07:13:00.0 |
HIP 9355 |
20.78 |
| 2026-09-26 00:00 |
02:00:51.80 |
+07:12:40.7 |
HIP 9355 |
20.09 |
| 2026-09-26 12:00 |
02:00:48.39 |
+07:12:21.3 |
HIP 9355 |
19.41 |
| 2026-09-27 00:00 |
02:00:44.97 |
+07:12:02.0 |
HIP 9355 |
18.74 |
| 2026-09-27 12:00 |
02:00:41.53 |
+07:11:42.5 |
HIP 9355 |
18.10 |
| 2026-09-28 00:00 |
02:00:38.08 |
+07:11:23.0 |
HIP 9355 |
17.47 |
| 2026-09-28 12:00 |
02:00:34.61 |
+07:11:03.5 |
HIP 9355 |
16.87 |
| 2026-09-29 00:00 |
02:00:31.13 |
+07:10:44.0 |
HIP 9355 |
16.30 |
| 2026-09-29 12:00 |
02:00:27.63 |
+07:10:24.4 |
HIP 9355 |
15.76 |
| 2026-09-30 00:00 |
02:00:24.12 |
+07:10:04.7 |
HIP 9355 |
15.26 |
| 2026-09-30 12:00 |
02:00:20.60 |
+07:09:45.0 |
HIP 9355 |
14.80 |
| 2026-10-01 00:00 |
02:00:17.06 |
+07:09:25.3 |
HIP 9355 |
14.38 |
| 2026-10-01 12:00 |
02:00:13.51 |
+07:09:05.5 |
HIP 9355 |
14.01 |
| 2026-10-02 00:00 |
02:00:09.94 |
+07:08:45.7 |
HIP 9355 |
13.70 |
| 2026-10-02 12:00 |
02:00:06.37 |
+07:08:25.9 |
HIP 9355 |
13.44 |
| 2026-10-03 00:00 |
02:00:02.78 |
+07:08:06.1 |
HIP 9355 |
13.25 |
| 2026-10-03 12:00 |
01:59:59.18 |
+07:07:46.2 |
HIP 9355 |
13.12 |
| 2026-10-04 00:00 |
01:59:55.56 |
+07:07:26.3 |
HIP 9355 |
13.07 |
| 2026-10-04 12:00 |
01:59:51.94 |
+07:07:06.3 |
HIP 9355 |
13.08 |
| 2026-10-05 00:00 |
01:59:48.30 |
+07:06:46.4 |
HIP 9355 |
13.17 |
| 2026-10-05 12:00 |
01:59:44.65 |
+07:06:26.4 |
HIP 9355 |
13.32 |
| 2026-10-06 00:00 |
01:59:40.99 |
+07:06:06.4 |
HIP 9355 |
13.55 |
| 2026-10-06 12:00 |
01:59:37.32 |
+07:05:46.3 |
HIP 9355 |
13.84 |
| 2026-10-07 00:00 |
01:59:33.64 |
+07:05:26.3 |
HIP 9355 |
14.19 |
| 2026-10-07 12:00 |
01:59:29.95 |
+07:05:06.2 |
HIP 9355 |
14.60 |
| 2026-10-08 00:00 |
01:59:26.25 |
+07:04:46.1 |
HIP 9355 |
15.06 |
| 2026-10-08 12:00 |
01:59:22.54 |
+07:04:26.1 |
HIP 9355 |
15.57 |
| 2026-10-09 00:00 |
01:59:18.82 |
+07:04:05.9 |
HIP 9355 |
16.13 |
| 2026-10-09 12:00 |
01:59:15.09 |
+07:03:45.8 |
HIP 9355 |
16.73 |
| 2026-10-10 00:00 |
01:59:11.35 |
+07:03:25.7 |
HIP 9355 |
17.37 |
| 2026-10-10 12:00 |
01:59:07.61 |
+07:03:05.6 |
HIP 9355 |
18.04 |
| 2026-10-11 00:00 |
01:59:03.85 |
+07:02:45.5 |
HIP 9355 |
18.74 |