メタデータ
| 項目 |
値 |
| Designation |
C/2015 B2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-05-06T13:45:33.413760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:05Z |
| Obs used |
242 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
7.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-01-19.0000000 |
| e |
1.00023551 |
| q (au) |
3.369608 |
| a (au) |
-14307.501597 |
| i (deg) |
105.088172 |
| Ω (om, deg) |
341.901291 |
| ω (w, deg) |
284.767940 |
| M (ma, deg) |
-0.000063 |
等級
散乱 + 全体線形
$$
M_a = (11.232 + 2.360\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.232 |
| n |
2.360 |
| gf |
1.000 |
| gb |
-0.502 |
| 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 |
| 2015-01-06 |
2016-03-11 |
+0.3867 |
-0.622 |
| 2016-06-30 |
2017-09-12 |
+5.7621 |
-2.956 |
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 |
19:51:34.10 |
+39:36:08.1 |
HIP 97728 |
3.98 |
| 2026-09-20 12:00 |
19:51:30.58 |
+39:35:11.6 |
HIP 97728 |
3.20 |
| 2026-09-21 00:00 |
19:51:27.12 |
+39:34:14.9 |
HIP 97728 |
2.69 |
| 2026-09-21 12:00 |
19:51:23.70 |
+39:33:18.0 |
HIP 97728 |
2.61 |
| 2026-09-22 00:00 |
19:51:20.34 |
+39:32:21.0 |
HIP 97682 |
2.85 |
| 2026-09-22 12:00 |
19:51:17.03 |
+39:31:23.7 |
HIP 97682 |
2.14 |
| 2026-09-23 00:00 |
19:51:13.77 |
+39:30:26.3 |
HIP 97682 |
1.94 |
| 2026-09-23 12:00 |
19:51:10.57 |
+39:29:28.7 |
HIP 97682 |
2.36 |
| 2026-09-24 00:00 |
19:51:07.41 |
+39:28:31.0 |
HIP 97682 |
3.16 |
| 2026-09-24 12:00 |
19:51:04.31 |
+39:27:33.1 |
HIP 97682 |
4.12 |
| 2026-09-25 00:00 |
19:51:01.26 |
+39:26:35.0 |
HIP 97682 |
5.16 |
| 2026-09-25 12:00 |
19:50:58.27 |
+39:25:36.8 |
HIP 97682 |
6.23 |
| 2026-09-26 00:00 |
19:50:55.33 |
+39:24:38.4 |
HIP 97682 |
7.32 |
| 2026-09-26 12:00 |
19:50:52.43 |
+39:23:39.9 |
HIP 97682 |
8.42 |
| 2026-09-27 00:00 |
19:50:49.60 |
+39:22:41.3 |
HIP 97682 |
9.52 |
| 2026-09-27 12:00 |
19:50:46.81 |
+39:21:42.5 |
HIP 97682 |
10.62 |
| 2026-09-28 00:00 |
19:50:44.08 |
+39:20:43.6 |
HIP 97682 |
11.73 |
| 2026-09-28 12:00 |
19:50:41.41 |
+39:19:44.5 |
HIP 97682 |
12.83 |
| 2026-09-29 00:00 |
19:50:38.78 |
+39:18:45.4 |
HIP 97682 |
13.94 |
| 2026-09-29 12:00 |
19:50:36.21 |
+39:17:46.1 |
HIP 97682 |
15.04 |
| 2026-09-30 00:00 |
19:50:33.69 |
+39:16:46.8 |
HIP 97682 |
16.14 |
| 2026-09-30 12:00 |
19:50:31.23 |
+39:15:47.3 |
HIP 97682 |
17.24 |
| 2026-10-01 00:00 |
19:50:28.82 |
+39:14:47.7 |
HIP 97682 |
18.33 |
| 2026-10-01 12:00 |
19:50:26.47 |
+39:13:48.1 |
HIP 97682 |
19.43 |
| 2026-10-02 00:00 |
19:50:24.17 |
+39:12:48.3 |
HIP 97556 |
19.74 |
| 2026-10-02 12:00 |
19:50:21.92 |
+39:11:48.5 |
HIP 97556 |
18.65 |
| 2026-10-03 00:00 |
19:50:19.73 |
+39:10:48.6 |
HIP 97556 |
17.56 |
| 2026-10-03 12:00 |
19:50:17.59 |
+39:09:48.6 |
HIP 97556 |
16.48 |
| 2026-10-04 00:00 |
19:50:15.51 |
+39:08:48.5 |
HIP 97556 |
15.40 |
| 2026-10-04 12:00 |
19:50:13.48 |
+39:07:48.4 |
HIP 97556 |
14.33 |
| 2026-10-05 00:00 |
19:50:11.51 |
+39:06:48.2 |
HIP 97556 |
13.26 |
| 2026-10-05 12:00 |
19:50:09.59 |
+39:05:48.0 |
HIP 97556 |
12.19 |
| 2026-10-06 00:00 |
19:50:07.72 |
+39:04:47.7 |
HIP 97556 |
11.12 |
| 2026-10-06 12:00 |
19:50:05.91 |
+39:03:47.3 |
HIP 97556 |
10.07 |
| 2026-10-07 00:00 |
19:50:04.16 |
+39:02:47.0 |
HIP 97556 |
9.01 |
| 2026-10-07 12:00 |
19:50:02.46 |
+39:01:46.6 |
HIP 97556 |
7.97 |
| 2026-10-08 00:00 |
19:50:00.82 |
+39:00:46.2 |
HIP 97556 |
6.93 |
| 2026-10-08 12:00 |
19:49:59.23 |
+38:59:45.7 |
HIP 97556 |
5.91 |
| 2026-10-09 00:00 |
19:49:57.70 |
+38:58:45.2 |
HIP 97556 |
4.90 |
| 2026-10-09 12:00 |
19:49:56.22 |
+38:57:44.8 |
HIP 97556 |
3.93 |
| 2026-10-10 00:00 |
19:49:54.80 |
+38:56:44.3 |
HIP 97556 |
3.02 |
| 2026-10-10 12:00 |
19:49:53.44 |
+38:55:43.8 |
HIP 97556 |
2.23 |
| 2026-10-11 00:00 |
19:49:52.13 |
+38:54:43.3 |
HIP 97556 |
1.74 |