P/2012 B1 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
03:44:13.59 |
+23:55:10.1 |
HIP 17499 |
14.65 |
| 2026-02-03 12:00 |
03:44:14.01 |
+23:55:03.8 |
HIP 17499 |
14.67 |
| 2026-02-04 00:00 |
03:44:14.57 |
+23:54:57.9 |
HIP 17499 |
14.67 |
| 2026-02-04 12:00 |
03:44:15.29 |
+23:54:52.5 |
HIP 17499 |
14.65 |
| 2026-02-05 00:00 |
03:44:16.16 |
+23:54:47.5 |
HIP 17499 |
14.61 |
| 2026-02-05 12:00 |
03:44:17.18 |
+23:54:42.9 |
HIP 17499 |
14.54 |
| 2026-02-06 00:00 |
03:44:18.34 |
+23:54:38.8 |
HIP 17499 |
14.45 |
| 2026-02-06 12:00 |
03:44:19.66 |
+23:54:35.2 |
HIP 17499 |
14.34 |
| 2026-02-07 00:00 |
03:44:21.12 |
+23:54:32.0 |
HIP 17499 |
14.22 |
| 2026-02-07 12:00 |
03:44:22.73 |
+23:54:29.2 |
HIP 17499 |
14.07 |
| 2026-02-08 00:00 |
03:44:24.49 |
+23:54:26.9 |
HIP 17499 |
13.92 |
| 2026-02-08 12:00 |
03:44:26.40 |
+23:54:25.1 |
HIP 17499 |
13.75 |
| 2026-02-09 00:00 |
03:44:28.45 |
+23:54:23.7 |
HIP 17499 |
13.57 |
| 2026-02-09 12:00 |
03:44:30.66 |
+23:54:22.7 |
HIP 17499 |
13.39 |
| 2026-02-10 00:00 |
03:44:33.01 |
+23:54:22.2 |
HIP 17499 |
13.21 |
| 2026-02-10 12:00 |
03:44:35.51 |
+23:54:22.2 |
HIP 17499 |
13.03 |
| 2026-02-11 00:00 |
03:44:38.15 |
+23:54:22.6 |
HIP 17499 |
12.86 |
| 2026-02-11 12:00 |
03:44:40.95 |
+23:54:23.4 |
HIP 17499 |
12.69 |
| 2026-02-12 00:00 |
03:44:43.89 |
+23:54:24.7 |
HIP 17499 |
12.55 |
| 2026-02-12 12:00 |
03:44:46.97 |
+23:54:26.5 |
HIP 17499 |
12.43 |
| 2026-02-13 00:00 |
03:44:50.21 |
+23:54:28.7 |
HIP 17499 |
12.34 |
| 2026-02-13 12:00 |
03:44:53.58 |
+23:54:31.4 |
HIP 17499 |
12.29 |
| 2026-02-14 00:00 |
03:44:57.11 |
+23:54:34.5 |
HIP 17499 |
12.28 |
| 2026-02-14 12:00 |
03:45:00.78 |
+23:54:38.0 |
HIP 17499 |
12.32 |
| 2026-02-15 00:00 |
03:45:04.59 |
+23:54:42.1 |
HIP 17499 |
12.42 |
| 2026-02-15 12:00 |
03:45:08.55 |
+23:54:46.5 |
HIP 17499 |
12.58 |
| 2026-02-16 00:00 |
03:45:12.66 |
+23:54:51.4 |
HIP 17499 |
12.80 |
| 2026-02-16 12:00 |
03:45:16.90 |
+23:54:56.8 |
HIP 17499 |
13.10 |
| 2026-02-17 00:00 |
03:45:21.30 |
+23:55:02.6 |
HIP 17608 |
13.44 |
| 2026-02-17 12:00 |
03:45:25.83 |
+23:55:08.9 |
HIP 17608 |
12.40 |
| 2026-02-18 00:00 |
03:45:30.51 |
+23:55:15.6 |
HIP 17608 |
11.33 |
| 2026-02-18 12:00 |
03:45:35.33 |
+23:55:22.8 |
HIP 17608 |
10.22 |
| 2026-02-19 00:00 |
03:45:40.29 |
+23:55:30.4 |
HIP 17608 |
9.08 |
| 2026-02-19 12:00 |
03:45:45.39 |
+23:55:38.4 |
HIP 17608 |
7.91 |
| 2026-02-20 00:00 |
03:45:50.64 |
+23:55:46.9 |
HIP 17608 |
6.70 |
| 2026-02-20 12:00 |
03:45:56.03 |
+23:55:55.8 |
HIP 17608 |
5.47 |
| 2026-02-21 00:00 |
03:46:01.55 |
+23:56:05.2 |
HIP 17608 |
4.20 |
| 2026-02-21 12:00 |
03:46:07.22 |
+23:56:15.0 |
HIP 17608 |
2.90 |
| 2026-02-22 00:00 |
03:46:13.02 |
+23:56:25.3 |
HIP 17608 |
1.57 |
| 2026-02-22 12:00 |
03:46:18.96 |
+23:56:35.9 |
HIP 17608 |
0.34 |
| 2026-02-23 00:00 |
03:46:25.04 |
+23:56:47.1 |
HIP 17608 |
1.26 |
| 2026-02-23 12:00 |
03:46:31.26 |
+23:56:58.6 |
HIP 17608 |
2.67 |
| 2026-02-24 00:00 |
03:46:37.61 |
+23:57:10.6 |
HIP 17608 |
4.13 |