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
$$
M_a = (7.999 + 2.835\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.999 |
| n |
2.835 |
| gf |
0.898 |
| gb |
-0.500 |
| k |
0.965 |
| δ90 |
1.020 |
| 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 |
-1.5915 |
+0.977 |
| 2017-06-06 |
2018-02-18 |
+13.0862 |
-8.231 |
| 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) |
| 2026-07-29 00:00 |
06:19:59.78 |
-05:21:09.7 |
HIP 30195 |
19.20 |
| 2026-07-29 12:00 |
06:20:03.94 |
-05:21:41.2 |
HIP 30195 |
18.04 |
| 2026-07-30 00:00 |
06:20:08.07 |
-05:22:13.0 |
HIP 30195 |
16.88 |
| 2026-07-30 12:00 |
06:20:12.18 |
-05:22:45.1 |
HIP 30195 |
15.73 |
| 2026-07-31 00:00 |
06:20:16.26 |
-05:23:17.5 |
HIP 30195 |
14.59 |
| 2026-07-31 12:00 |
06:20:20.32 |
-05:23:50.1 |
HIP 30195 |
13.44 |
| 2026-08-01 00:00 |
06:20:24.36 |
-05:24:23.0 |
HIP 30195 |
12.30 |
| 2026-08-01 12:00 |
06:20:28.37 |
-05:24:56.2 |
HIP 30195 |
11.17 |
| 2026-08-02 00:00 |
06:20:32.35 |
-05:25:29.7 |
HIP 30195 |
10.04 |
| 2026-08-02 12:00 |
06:20:36.31 |
-05:26:03.4 |
HIP 30195 |
8.92 |
| 2026-08-03 00:00 |
06:20:40.24 |
-05:26:37.4 |
HIP 30195 |
7.81 |
| 2026-08-03 12:00 |
06:20:44.14 |
-05:27:11.6 |
HIP 30195 |
6.71 |
| 2026-08-04 00:00 |
06:20:48.02 |
-05:27:46.2 |
HIP 30195 |
5.63 |
| 2026-08-04 12:00 |
06:20:51.87 |
-05:28:21.0 |
HIP 30195 |
4.57 |
| 2026-08-05 00:00 |
06:20:55.70 |
-05:28:56.0 |
HIP 30195 |
3.56 |
| 2026-08-05 12:00 |
06:20:59.49 |
-05:29:31.3 |
HIP 30195 |
2.64 |
| 2026-08-06 00:00 |
06:21:03.26 |
-05:30:06.9 |
HIP 30195 |
1.94 |
| 2026-08-06 12:00 |
06:21:07.00 |
-05:30:42.8 |
HIP 30195 |
1.75 |
| 2026-08-07 00:00 |
06:21:10.72 |
-05:31:18.9 |
HIP 30195 |
2.19 |
| 2026-08-07 12:00 |
06:21:14.40 |
-05:31:55.2 |
HIP 30195 |
3.00 |
| 2026-08-08 00:00 |
06:21:18.05 |
-05:32:31.9 |
HIP 30195 |
3.95 |
| 2026-08-08 12:00 |
06:21:21.68 |
-05:33:08.7 |
HIP 30195 |
4.96 |
| 2026-08-09 00:00 |
06:21:25.27 |
-05:33:45.9 |
HIP 30195 |
6.00 |
| 2026-08-09 12:00 |
06:21:28.83 |
-05:34:23.3 |
HIP 30195 |
7.05 |
| 2026-08-10 00:00 |
06:21:32.37 |
-05:35:00.9 |
HIP 30195 |
8.11 |
| 2026-08-10 12:00 |
06:21:35.87 |
-05:35:38.8 |
HIP 30195 |
9.17 |
| 2026-08-11 00:00 |
06:21:39.34 |
-05:36:16.9 |
HIP 30195 |
10.23 |
| 2026-08-11 12:00 |
06:21:42.78 |
-05:36:55.3 |
HIP 30269 |
10.81 |
| 2026-08-12 00:00 |
06:21:46.19 |
-05:37:33.9 |
HIP 30269 |
11.05 |
| 2026-08-12 12:00 |
06:21:49.57 |
-05:38:12.8 |
HIP 30269 |
11.39 |
| 2026-08-13 00:00 |
06:21:52.91 |
-05:38:51.9 |
HIP 30269 |
11.82 |
| 2026-08-13 12:00 |
06:21:56.22 |
-05:39:31.2 |
HIP 30269 |
12.34 |
| 2026-08-14 00:00 |
06:21:59.50 |
-05:40:10.8 |
HIP 30269 |
12.92 |
| 2026-08-14 12:00 |
06:22:02.74 |
-05:40:50.6 |
HIP 30269 |
13.56 |
| 2026-08-15 00:00 |
06:22:05.96 |
-05:41:30.6 |
HIP 30269 |
14.25 |
| 2026-08-15 12:00 |
06:22:09.13 |
-05:42:10.9 |
HIP 30269 |
14.99 |
| 2026-08-16 00:00 |
06:22:12.28 |
-05:42:51.4 |
HIP 30269 |
15.76 |
| 2026-08-16 12:00 |
06:22:15.38 |
-05:43:32.1 |
HIP 30269 |
16.56 |
| 2026-08-17 00:00 |
06:22:18.46 |
-05:44:13.0 |
HIP 30269 |
17.39 |
| 2026-08-17 12:00 |
06:22:21.50 |
-05:44:54.2 |
HIP 30269 |
18.24 |
| 2026-08-18 00:00 |
06:22:24.50 |
-05:45:35.6 |
HIP 30269 |
19.11 |
| 2026-08-18 12:00 |
06:22:27.47 |
-05:46:17.2 |
HIP 30269 |
19.99 |
| 2026-08-19 00:00 |
06:22:30.40 |
-05:46:59.0 |
HIP 30269 |
20.89 |