メタデータ
| 項目 |
値 |
| Designation |
P/2012 B1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-23T03:26:57.641280Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:35Z |
| Obs used |
1189 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
12.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-02-05.0000000 |
| e |
0.41050358 |
| q (au) |
3.825153 |
| a (au) |
6.488848 |
| i (deg) |
7.627784 |
| Ω (om, deg) |
36.194183 |
| ω (w, deg) |
162.183007 |
| M (ma, deg) |
349.973869 |
等級
散乱 + 全体線形
$$
M_a = (3.981 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.981 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2011-12-31 |
2013-07-20 |
+5.5281 |
-3.279 |
| 2013-08-25 |
2015-06-10 |
+9.6303 |
-6.962 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
05:37:51.84 |
+28:22:35.6 |
HIP 26574 |
15.39 |
| 2026-09-20 12:00 |
05:37:57.82 |
+28:23:09.2 |
HIP 26574 |
13.97 |
| 2026-09-21 00:00 |
05:38:03.64 |
+28:23:42.8 |
HIP 26574 |
12.57 |
| 2026-09-21 12:00 |
05:38:09.32 |
+28:24:16.4 |
HIP 26574 |
11.21 |
| 2026-09-22 00:00 |
05:38:14.84 |
+28:24:49.9 |
HIP 26574 |
9.89 |
| 2026-09-22 12:00 |
05:38:20.22 |
+28:25:23.5 |
HIP 26574 |
8.60 |
| 2026-09-23 00:00 |
05:38:25.44 |
+28:25:57.0 |
HIP 26574 |
7.35 |
| 2026-09-23 12:00 |
05:38:30.50 |
+28:26:30.5 |
HIP 26574 |
6.15 |
| 2026-09-24 00:00 |
05:38:35.42 |
+28:27:04.0 |
HIP 26574 |
5.00 |
| 2026-09-24 12:00 |
05:38:40.18 |
+28:27:37.5 |
HIP 26574 |
3.92 |
| 2026-09-25 00:00 |
05:38:44.78 |
+28:28:10.9 |
HIP 26574 |
2.97 |
| 2026-09-25 12:00 |
05:38:49.23 |
+28:28:44.3 |
HIP 26574 |
2.24 |
| 2026-09-26 00:00 |
05:38:53.52 |
+28:29:17.8 |
HIP 26574 |
1.96 |
| 2026-09-26 12:00 |
05:38:57.66 |
+28:29:51.1 |
HIP 26574 |
2.24 |
| 2026-09-27 00:00 |
05:39:01.64 |
+28:30:24.5 |
HIP 26574 |
2.91 |
| 2026-09-27 12:00 |
05:39:05.46 |
+28:30:57.8 |
HIP 26574 |
3.73 |
| 2026-09-28 00:00 |
05:39:09.12 |
+28:31:31.1 |
HIP 26574 |
4.61 |
| 2026-09-28 12:00 |
05:39:12.63 |
+28:32:04.4 |
HIP 26574 |
5.50 |
| 2026-09-29 00:00 |
05:39:15.97 |
+28:32:37.7 |
HIP 26574 |
6.38 |
| 2026-09-29 12:00 |
05:39:19.16 |
+28:33:10.9 |
HIP 26574 |
7.25 |
| 2026-09-30 00:00 |
05:39:22.18 |
+28:33:44.1 |
HIP 26574 |
8.11 |
| 2026-09-30 12:00 |
05:39:25.05 |
+28:34:17.3 |
HIP 26574 |
8.94 |
| 2026-10-01 00:00 |
05:39:27.75 |
+28:34:50.4 |
HIP 26574 |
9.74 |
| 2026-10-01 12:00 |
05:39:30.29 |
+28:35:23.5 |
HIP 26574 |
10.53 |
| 2026-10-02 00:00 |
05:39:32.67 |
+28:35:56.5 |
HIP 26574 |
11.29 |
| 2026-10-02 12:00 |
05:39:34.88 |
+28:36:29.6 |
HIP 26574 |
12.02 |
| 2026-10-03 00:00 |
05:39:36.93 |
+28:37:02.5 |
HIP 26574 |
12.73 |
| 2026-10-03 12:00 |
05:39:38.81 |
+28:37:35.5 |
HIP 26574 |
13.41 |
| 2026-10-04 00:00 |
05:39:40.53 |
+28:38:08.4 |
HIP 26574 |
14.07 |
| 2026-10-04 12:00 |
05:39:42.09 |
+28:38:41.2 |
HIP 26574 |
14.71 |
| 2026-10-05 00:00 |
05:39:43.48 |
+28:39:14.0 |
HIP 26574 |
15.32 |
| 2026-10-05 12:00 |
05:39:44.70 |
+28:39:46.8 |
HIP 26574 |
15.91 |
| 2026-10-06 00:00 |
05:39:45.75 |
+28:40:19.5 |
HIP 26574 |
16.48 |
| 2026-10-06 12:00 |
05:39:46.64 |
+28:40:52.2 |
HIP 26574 |
17.02 |
| 2026-10-07 00:00 |
05:39:47.35 |
+28:41:24.8 |
HIP 26574 |
17.55 |
| 2026-10-07 12:00 |
05:39:47.90 |
+28:41:57.4 |
HIP 26574 |
18.05 |
| 2026-10-08 00:00 |
05:39:48.28 |
+28:42:29.9 |
HIP 26574 |
18.53 |
| 2026-10-08 12:00 |
05:39:48.50 |
+28:43:02.3 |
HIP 26711 |
18.70 |
| 2026-10-09 00:00 |
05:39:48.54 |
+28:43:34.7 |
HIP 26711 |
18.25 |
| 2026-10-09 12:00 |
05:39:48.41 |
+28:44:07.0 |
HIP 26711 |
17.83 |
| 2026-10-10 00:00 |
05:39:48.11 |
+28:44:39.2 |
HIP 26711 |
17.43 |
| 2026-10-10 12:00 |
05:39:47.64 |
+28:45:11.4 |
HIP 26711 |
17.07 |
| 2026-10-11 00:00 |
05:39:47.01 |
+28:45:43.5 |
HIP 26711 |
16.74 |