C/2015 B2 (PANSTARRS)
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 |
-0.777 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-02-03 00:00 |
20:09:22.74 |
+36:06:49.1 |
HIP 99284 |
9.46 |
| 2026-02-03 12:00 |
20:09:28.23 |
+36:07:19.2 |
HIP 99372 |
9.71 |
| 2026-02-04 00:00 |
20:09:33.70 |
+36:07:49.7 |
HIP 99372 |
8.49 |
| 2026-02-04 12:00 |
20:09:39.16 |
+36:08:20.8 |
HIP 99372 |
7.27 |
| 2026-02-05 00:00 |
20:09:44.61 |
+36:08:52.4 |
HIP 99372 |
6.05 |
| 2026-02-05 12:00 |
20:09:50.04 |
+36:09:24.4 |
HIP 99372 |
4.83 |
| 2026-02-06 00:00 |
20:09:55.46 |
+36:09:57.0 |
HIP 99372 |
3.61 |
| 2026-02-06 12:00 |
20:10:00.86 |
+36:10:30.0 |
HIP 99372 |
2.39 |
| 2026-02-07 00:00 |
20:10:06.25 |
+36:11:03.5 |
HIP 99372 |
1.17 |
| 2026-02-07 12:00 |
20:10:11.63 |
+36:11:37.5 |
HIP 99372 |
0.15 |
| 2026-02-08 00:00 |
20:10:16.98 |
+36:12:12.0 |
HIP 99372 |
1.29 |
| 2026-02-08 12:00 |
20:10:22.32 |
+36:12:47.0 |
HIP 99372 |
2.51 |
| 2026-02-09 00:00 |
20:10:27.64 |
+36:13:22.4 |
HIP 99372 |
3.74 |
| 2026-02-09 12:00 |
20:10:32.95 |
+36:13:58.4 |
HIP 99372 |
4.96 |
| 2026-02-10 00:00 |
20:10:38.23 |
+36:14:34.8 |
HIP 99372 |
6.19 |
| 2026-02-10 12:00 |
20:10:43.50 |
+36:15:11.7 |
HIP 99372 |
7.42 |
| 2026-02-11 00:00 |
20:10:48.75 |
+36:15:49.1 |
HIP 99372 |
8.65 |
| 2026-02-11 12:00 |
20:10:53.98 |
+36:16:26.9 |
HIP 99372 |
9.87 |
| 2026-02-12 00:00 |
20:10:59.19 |
+36:17:05.2 |
HIP 99372 |
11.10 |
| 2026-02-12 12:00 |
20:11:04.39 |
+36:17:44.0 |
HIP 99525 |
11.53 |
| 2026-02-13 00:00 |
20:11:09.56 |
+36:18:23.2 |
HIP 99525 |
11.02 |
| 2026-02-13 12:00 |
20:11:14.71 |
+36:19:02.9 |
HIP 99525 |
10.64 |
| 2026-02-14 00:00 |
20:11:19.84 |
+36:19:43.1 |
HIP 99525 |
10.40 |
| 2026-02-14 12:00 |
20:11:24.94 |
+36:20:23.7 |
HIP 99525 |
10.31 |
| 2026-02-15 00:00 |
20:11:30.03 |
+36:21:04.8 |
HIP 99525 |
10.38 |
| 2026-02-15 12:00 |
20:11:35.09 |
+36:21:46.3 |
HIP 99525 |
10.60 |
| 2026-02-16 00:00 |
20:11:40.13 |
+36:22:28.3 |
HIP 99525 |
10.97 |
| 2026-02-16 12:00 |
20:11:45.15 |
+36:23:10.8 |
HIP 99525 |
11.46 |
| 2026-02-17 00:00 |
20:11:50.15 |
+36:23:53.6 |
HIP 99525 |
12.07 |
| 2026-02-17 12:00 |
20:11:55.12 |
+36:24:36.9 |
HIP 99525 |
12.78 |
| 2026-02-18 00:00 |
20:12:00.06 |
+36:25:20.7 |
HIP 99525 |
13.57 |
| 2026-02-18 12:00 |
20:12:04.98 |
+36:26:04.9 |
HIP 99525 |
14.42 |
| 2026-02-19 00:00 |
20:12:09.88 |
+36:26:49.5 |
HIP 99525 |
15.34 |
| 2026-02-19 12:00 |
20:12:14.75 |
+36:27:34.6 |
HIP 99525 |
16.30 |
| 2026-02-20 00:00 |
20:12:19.59 |
+36:28:20.1 |
HIP 99667 |
17.11 |
| 2026-02-20 12:00 |
20:12:24.41 |
+36:29:06.0 |
HIP 99667 |
16.69 |
| 2026-02-21 00:00 |
20:12:29.20 |
+36:29:52.3 |
HIP 99628 |
16.01 |
| 2026-02-21 12:00 |
20:12:33.97 |
+36:30:39.1 |
HIP 99628 |
14.85 |
| 2026-02-22 00:00 |
20:12:38.70 |
+36:31:26.3 |
HIP 99628 |
13.70 |
| 2026-02-22 12:00 |
20:12:43.41 |
+36:32:13.8 |
HIP 99628 |
12.57 |
| 2026-02-23 00:00 |
20:12:48.09 |
+36:33:01.8 |
HIP 99628 |
11.45 |
| 2026-02-23 12:00 |
20:12:52.74 |
+36:33:50.2 |
HIP 99628 |
10.35 |
| 2026-02-24 00:00 |
20:12:57.37 |
+36:34:39.0 |
HIP 99628 |
9.28 |