C/2015 O1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 O1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-02-19T00:42:22.034880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
3677 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
8.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-02-12.0000000 |
| e |
0.99999427 |
| q (au) |
3.729638 |
| a (au) |
651202.297761 |
| i (deg) |
127.211078 |
| Ω (om, deg) |
299.855849 |
| ω (w, deg) |
89.593861 |
| M (ma, deg) |
360.000000 |
等級
散乱 + 全体線形
$$
M_a = (7.985 + 2.835\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.985 |
| n |
2.835 |
| gf |
0.895 |
| gb |
-0.500 |
| k |
0.966 |
| δ90 |
1.089 |
| 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 |
| 2015-06-15 |
2017-06-06 |
-1.5918 |
+0.977 |
| 2017-06-06 |
2018-02-18 |
+13.0867 |
-8.232 |
| 2018-02-21 |
2020-03-20 |
+2.8414 |
-2.032 |
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 |
06:09:44.37 |
-06:42:58.1 |
HIP 29140 |
15.42 |
| 2026-02-03 12:00 |
06:09:38.95 |
-06:42:34.0 |
HIP 29140 |
14.38 |
| 2026-02-04 00:00 |
06:09:33.57 |
-06:42:09.6 |
HIP 29140 |
13.43 |
| 2026-02-04 12:00 |
06:09:28.23 |
-06:41:44.9 |
HIP 29140 |
12.57 |
| 2026-02-05 00:00 |
06:09:22.94 |
-06:41:20.0 |
HIP 29140 |
11.82 |
| 2026-02-05 12:00 |
06:09:17.69 |
-06:40:54.7 |
HIP 29140 |
11.20 |
| 2026-02-06 00:00 |
06:09:12.48 |
-06:40:29.2 |
HIP 29140 |
10.73 |
| 2026-02-06 12:00 |
06:09:07.31 |
-06:40:03.4 |
HIP 29140 |
10.43 |
| 2026-02-07 00:00 |
06:09:02.19 |
-06:39:37.4 |
HIP 29140 |
10.31 |
| 2026-02-07 12:00 |
06:08:57.11 |
-06:39:11.0 |
HIP 29140 |
10.37 |
| 2026-02-08 00:00 |
06:08:52.08 |
-06:38:44.4 |
HIP 29115 |
9.17 |
| 2026-02-08 12:00 |
06:08:47.09 |
-06:38:17.6 |
HIP 29115 |
7.94 |
| 2026-02-09 00:00 |
06:08:42.15 |
-06:37:50.5 |
HIP 29115 |
6.75 |
| 2026-02-09 12:00 |
06:08:37.26 |
-06:37:23.1 |
HIP 29115 |
5.61 |
| 2026-02-10 00:00 |
06:08:32.41 |
-06:36:55.5 |
HIP 29115 |
4.57 |
| 2026-02-10 12:00 |
06:08:27.60 |
-06:36:27.7 |
HIP 29115 |
3.68 |
| 2026-02-11 00:00 |
06:08:22.84 |
-06:35:59.6 |
HIP 29115 |
3.08 |
| 2026-02-11 12:00 |
06:08:18.13 |
-06:35:31.2 |
HIP 29115 |
2.93 |
| 2026-02-12 00:00 |
06:08:13.47 |
-06:35:02.7 |
HIP 29115 |
3.29 |
| 2026-02-12 12:00 |
06:08:08.85 |
-06:34:33.9 |
HIP 29115 |
4.01 |
| 2026-02-13 00:00 |
06:08:04.28 |
-06:34:04.8 |
HIP 29115 |
4.93 |
| 2026-02-13 12:00 |
06:07:59.76 |
-06:33:35.6 |
HIP 29115 |
5.95 |
| 2026-02-14 00:00 |
06:07:55.29 |
-06:33:06.1 |
HIP 29115 |
7.02 |
| 2026-02-14 12:00 |
06:07:50.87 |
-06:32:36.4 |
HIP 29115 |
8.13 |
| 2026-02-15 00:00 |
06:07:46.50 |
-06:32:06.4 |
HIP 29115 |
9.24 |
| 2026-02-15 12:00 |
06:07:42.17 |
-06:31:36.3 |
HIP 29115 |
10.36 |
| 2026-02-16 00:00 |
06:07:37.89 |
-06:31:06.0 |
HIP 29115 |
11.49 |
| 2026-02-16 12:00 |
06:07:33.67 |
-06:30:35.4 |
HIP 29082 |
11.86 |
| 2026-02-17 00:00 |
06:07:29.49 |
-06:30:04.7 |
HIP 29082 |
12.22 |
| 2026-02-17 12:00 |
06:07:25.37 |
-06:29:33.8 |
HIP 29082 |
12.65 |
| 2026-02-18 00:00 |
06:07:21.29 |
-06:29:02.6 |
HIP 29082 |
13.16 |
| 2026-02-18 12:00 |
06:07:17.27 |
-06:28:31.3 |
HIP 29082 |
13.73 |
| 2026-02-19 00:00 |
06:07:13.29 |
-06:27:59.8 |
HIP 29082 |
14.36 |
| 2026-02-19 12:00 |
06:07:09.37 |
-06:27:28.1 |
HIP 29082 |
15.03 |
| 2026-02-20 00:00 |
06:07:05.50 |
-06:26:56.3 |
HIP 28985 |
14.88 |
| 2026-02-20 12:00 |
06:07:01.68 |
-06:26:24.2 |
HIP 28985 |
14.27 |
| 2026-02-21 00:00 |
06:06:57.91 |
-06:25:52.0 |
HIP 28985 |
13.71 |
| 2026-02-21 12:00 |
06:06:54.19 |
-06:25:19.7 |
HIP 28985 |
13.21 |
| 2026-02-22 00:00 |
06:06:50.53 |
-06:24:47.1 |
HIP 28985 |
12.78 |
| 2026-02-22 12:00 |
06:06:46.92 |
-06:24:14.5 |
HIP 28985 |
12.42 |
| 2026-02-23 00:00 |
06:06:43.36 |
-06:23:41.6 |
HIP 28985 |
12.14 |
| 2026-02-23 12:00 |
06:06:39.85 |
-06:23:08.6 |
HIP 28985 |
11.93 |
| 2026-02-24 00:00 |
06:06:36.40 |
-06:22:35.5 |
HIP 28985 |
11.80 |