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) |
| 2026-06-01 00:00 |
20:13:53.73 |
+40:00:24.7 |
HIP 99760 |
20.30 |
| 2026-06-01 12:00 |
20:13:49.10 |
+40:01:15.7 |
HIP 99760 |
19.79 |
| 2026-06-02 00:00 |
20:13:44.41 |
+40:02:06.2 |
HIP 99760 |
19.36 |
| 2026-06-02 12:00 |
20:13:39.69 |
+40:02:56.4 |
HIP 99580 |
18.29 |
| 2026-06-03 00:00 |
20:13:34.92 |
+40:03:46.2 |
HIP 99580 |
17.06 |
| 2026-06-03 12:00 |
20:13:30.10 |
+40:04:35.5 |
HIP 99580 |
15.83 |
| 2026-06-04 00:00 |
20:13:25.24 |
+40:05:24.4 |
HIP 99580 |
14.60 |
| 2026-06-04 12:00 |
20:13:20.34 |
+40:06:12.9 |
HIP 99580 |
13.37 |
| 2026-06-05 00:00 |
20:13:15.40 |
+40:07:00.9 |
HIP 99580 |
12.15 |
| 2026-06-05 12:00 |
20:13:10.41 |
+40:07:48.6 |
HIP 99580 |
10.92 |
| 2026-06-06 00:00 |
20:13:05.38 |
+40:08:35.7 |
HIP 99580 |
9.70 |
| 2026-06-06 12:00 |
20:13:00.30 |
+40:09:22.5 |
HIP 99580 |
8.49 |
| 2026-06-07 00:00 |
20:12:55.19 |
+40:10:08.8 |
HIP 99580 |
7.29 |
| 2026-06-07 12:00 |
20:12:50.03 |
+40:10:54.7 |
HIP 99580 |
6.10 |
| 2026-06-08 00:00 |
20:12:44.84 |
+40:11:40.1 |
HIP 99580 |
4.96 |
| 2026-06-08 12:00 |
20:12:39.60 |
+40:12:25.0 |
HIP 99580 |
3.88 |
| 2026-06-09 00:00 |
20:12:34.32 |
+40:13:09.5 |
HIP 99580 |
2.94 |
| 2026-06-09 12:00 |
20:12:29.00 |
+40:13:53.6 |
HIP 99580 |
2.34 |
| 2026-06-10 00:00 |
20:12:23.64 |
+40:14:37.1 |
HIP 99580 |
2.33 |
| 2026-06-10 12:00 |
20:12:18.24 |
+40:15:20.2 |
HIP 99580 |
2.94 |
| 2026-06-11 00:00 |
20:12:12.80 |
+40:16:02.9 |
HIP 99580 |
3.88 |
| 2026-06-11 12:00 |
20:12:07.33 |
+40:16:45.0 |
HIP 99515 |
4.87 |
| 2026-06-12 00:00 |
20:12:01.81 |
+40:17:26.7 |
HIP 99515 |
3.62 |
| 2026-06-12 12:00 |
20:11:56.26 |
+40:18:07.9 |
HIP 99515 |
2.38 |
| 2026-06-13 00:00 |
20:11:50.66 |
+40:18:48.6 |
HIP 99515 |
1.17 |
| 2026-06-13 12:00 |
20:11:45.03 |
+40:19:28.8 |
HIP 99515 |
0.55 |
| 2026-06-14 00:00 |
20:11:39.37 |
+40:20:08.6 |
HIP 99515 |
1.57 |
| 2026-06-14 12:00 |
20:11:33.66 |
+40:20:47.8 |
HIP 99515 |
2.80 |
| 2026-06-15 00:00 |
20:11:27.93 |
+40:21:26.5 |
HIP 99515 |
4.06 |
| 2026-06-15 12:00 |
20:11:22.15 |
+40:22:04.8 |
HIP 99515 |
5.32 |
| 2026-06-16 00:00 |
20:11:16.34 |
+40:22:42.5 |
HIP 99515 |
6.59 |
| 2026-06-16 12:00 |
20:11:10.49 |
+40:23:19.7 |
HIP 99515 |
7.86 |
| 2026-06-17 00:00 |
20:11:04.61 |
+40:23:56.4 |
HIP 99515 |
9.14 |
| 2026-06-17 12:00 |
20:10:58.70 |
+40:24:32.6 |
HIP 99515 |
10.42 |
| 2026-06-18 00:00 |
20:10:52.75 |
+40:25:08.3 |
HIP 99515 |
11.69 |
| 2026-06-18 12:00 |
20:10:46.77 |
+40:25:43.5 |
HIP 99331 |
12.60 |
| 2026-06-19 00:00 |
20:10:40.76 |
+40:26:18.1 |
HIP 99331 |
11.47 |
| 2026-06-19 12:00 |
20:10:34.71 |
+40:26:52.2 |
HIP 99331 |
10.37 |
| 2026-06-20 00:00 |
20:10:28.63 |
+40:27:25.8 |
HIP 99331 |
9.31 |
| 2026-06-20 12:00 |
20:10:22.52 |
+40:27:58.9 |
HIP 99331 |
8.30 |
| 2026-06-21 00:00 |
20:10:16.38 |
+40:28:31.4 |
HIP 99331 |
7.37 |
| 2026-06-21 12:00 |
20:10:10.21 |
+40:29:03.4 |
HIP 99331 |
6.56 |
| 2026-06-22 00:00 |
20:10:04.01 |
+40:29:34.9 |
HIP 99331 |
5.91 |