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) |
| 2026-03-26 00:00 |
03:56:46.07 |
+24:20:56.7 |
HIP 18508 |
11.41 |
| 2026-03-26 12:00 |
03:56:59.62 |
+24:21:30.7 |
HIP 18508 |
8.70 |
| 2026-03-27 00:00 |
03:57:13.26 |
+24:22:05.0 |
HIP 18508 |
6.38 |
| 2026-03-27 12:00 |
03:57:26.99 |
+24:22:39.6 |
HIP 18508 |
5.06 |
| 2026-03-28 00:00 |
03:57:40.82 |
+24:23:14.4 |
HIP 18508 |
5.55 |
| 2026-03-28 12:00 |
03:57:54.75 |
+24:23:49.5 |
HIP 18508 |
7.54 |
| 2026-03-29 00:00 |
03:58:08.77 |
+24:24:24.8 |
HIP 18508 |
10.20 |
| 2026-03-29 12:00 |
03:58:22.88 |
+24:25:00.4 |
HIP 18508 |
13.14 |
| 2026-03-30 00:00 |
03:58:37.09 |
+24:25:36.3 |
HIP 18508 |
16.23 |
| 2026-03-30 12:00 |
03:58:51.39 |
+24:26:12.4 |
HIP 18508 |
19.40 |
| 2026-03-31 00:00 |
03:59:05.78 |
+24:26:48.7 |
HIP 18508 |
22.64 |
| 2026-03-31 12:00 |
03:59:20.26 |
+24:27:25.3 |
HIP 18508 |
25.92 |
| 2026-04-01 00:00 |
03:59:34.84 |
+24:28:02.2 |
HIP 18559 |
28.64 |
| 2026-04-01 12:00 |
03:59:49.50 |
+24:28:39.3 |
HIP 18559 |
31.20 |
| 2026-04-02 00:00 |
04:00:04.25 |
+24:29:16.6 |
HIP 18559 |
33.92 |
| 2026-04-02 12:00 |
04:00:19.09 |
+24:29:54.2 |
HIP 18559 |
36.77 |
| 2026-04-03 00:00 |
04:00:34.01 |
+24:30:32.0 |
HIP 18559 |
39.73 |
| 2026-04-03 12:00 |
04:00:49.02 |
+24:31:10.0 |
HIP 18559 |
42.79 |
| 2026-04-04 00:00 |
04:01:04.12 |
+24:31:48.3 |
HIP 18943 |
42.82 |
| 2026-04-04 12:00 |
04:01:19.31 |
+24:32:26.7 |
HIP 18943 |
39.67 |
| 2026-04-05 00:00 |
04:01:34.58 |
+24:33:05.5 |
HIP 18943 |
36.57 |
| 2026-04-05 12:00 |
04:01:49.94 |
+24:33:44.4 |
HIP 18943 |
33.54 |
| 2026-04-06 00:00 |
04:02:05.37 |
+24:34:23.5 |
HIP 18943 |
30.60 |
| 2026-04-06 12:00 |
04:02:20.90 |
+24:35:02.9 |
HIP 18943 |
27.80 |
| 2026-04-07 00:00 |
04:02:36.50 |
+24:35:42.4 |
HIP 18943 |
25.19 |
| 2026-04-07 12:00 |
04:02:52.19 |
+24:36:22.2 |
HIP 18943 |
22.83 |
| 2026-04-08 00:00 |
04:03:07.96 |
+24:37:02.2 |
HIP 18943 |
20.84 |
| 2026-04-08 12:00 |
04:03:23.81 |
+24:37:42.3 |
HIP 18943 |
19.32 |
| 2026-04-09 00:00 |
04:03:39.74 |
+24:38:22.7 |
HIP 18943 |
18.41 |
| 2026-04-09 12:00 |
04:03:55.75 |
+24:39:03.3 |
HIP 18943 |
18.21 |
| 2026-04-10 00:00 |
04:04:11.84 |
+24:39:44.0 |
HIP 18943 |
18.76 |
| 2026-04-10 12:00 |
04:04:28.01 |
+24:40:25.0 |
HIP 18943 |
20.00 |
| 2026-04-11 00:00 |
04:04:44.25 |
+24:41:06.1 |
HIP 19137 |
18.49 |
| 2026-04-11 12:00 |
04:05:00.57 |
+24:41:47.4 |
HIP 19137 |
14.72 |
| 2026-04-12 00:00 |
04:05:16.97 |
+24:42:29.0 |
HIP 19137 |
10.93 |
| 2026-04-12 12:00 |
04:05:33.45 |
+24:43:10.6 |
HIP 19137 |
7.13 |
| 2026-04-13 00:00 |
04:05:50.00 |
+24:43:52.5 |
HIP 19137 |
3.34 |
| 2026-04-13 12:00 |
04:06:06.62 |
+24:44:34.5 |
HIP 19137 |
0.78 |
| 2026-04-14 00:00 |
04:06:23.32 |
+24:45:16.7 |
HIP 19137 |
4.44 |
| 2026-04-14 12:00 |
04:06:40.09 |
+24:45:59.1 |
HIP 19137 |
8.30 |
| 2026-04-15 00:00 |
04:06:56.94 |
+24:46:41.6 |
HIP 19137 |
12.18 |
| 2026-04-15 12:00 |
04:07:13.86 |
+24:47:24.3 |
HIP 19137 |
16.08 |
| 2026-04-16 00:00 |
04:07:30.84 |
+24:48:07.2 |
HIP 19137 |
20.00 |