メタデータ
| 項目 |
値 |
| Designation |
C/2020 PV6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-25T23:59:11.313600Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:24Z |
| Obs used |
1749 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
17.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-09-30.0000000 |
| e |
0.94495091 |
| q (au) |
2.295631 |
| a (au) |
41.701535 |
| i (deg) |
128.239287 |
| Ω (om, deg) |
329.143872 |
| ω (w, deg) |
71.380642 |
| M (ma, deg) |
0.014642 |
等級
散乱 + 全体線形
$$
M_a = (6.667 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.667 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
| 2021-05-30 |
2021-09-22 |
+4.0425 |
-1.521 |
| 2021-09-26 |
2022-05-23 |
+13.2958 |
-5.599 |
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) |
| 2026-09-25 00:00 |
08:46:26.92 |
-02:47:32.9 |
HIP 42951 |
20.12 |
| 2026-09-25 12:00 |
08:46:30.41 |
-02:48:36.3 |
HIP 42951 |
21.44 |
| 2026-09-26 00:00 |
08:46:33.86 |
-02:49:39.8 |
HIP 42951 |
22.76 |
| 2026-09-26 12:00 |
08:46:37.25 |
-02:50:43.3 |
HIP 42951 |
24.08 |
| 2026-09-27 00:00 |
08:46:40.59 |
-02:51:46.8 |
HIP 42951 |
25.39 |
| 2026-09-27 12:00 |
08:46:43.88 |
-02:52:50.4 |
HIP 42951 |
26.69 |
| 2026-09-28 00:00 |
08:46:47.11 |
-02:53:54.0 |
HIP 42951 |
27.99 |
| 2026-09-28 12:00 |
08:46:50.29 |
-02:54:57.7 |
HIP 42951 |
29.27 |
| 2026-09-29 00:00 |
08:46:53.42 |
-02:56:01.4 |
HIP 42951 |
30.56 |
| 2026-09-29 12:00 |
08:46:56.49 |
-02:57:05.1 |
HIP 42951 |
31.83 |
| 2026-09-30 00:00 |
08:46:59.51 |
-02:58:08.8 |
HIP 42951 |
33.10 |
| 2026-09-30 12:00 |
08:47:02.47 |
-02:59:12.6 |
HIP 42951 |
34.36 |
| 2026-10-01 00:00 |
08:47:05.38 |
-03:00:16.4 |
HIP 43235 |
35.35 |
| 2026-10-01 12:00 |
08:47:08.23 |
-03:01:20.2 |
HIP 43235 |
35.84 |
| 2026-10-02 00:00 |
08:47:11.02 |
-03:02:24.0 |
HIP 43235 |
36.37 |
| 2026-10-02 12:00 |
08:47:13.76 |
-03:03:27.8 |
HIP 43235 |
36.94 |
| 2026-10-03 00:00 |
08:47:16.44 |
-03:04:31.6 |
HIP 43235 |
37.56 |
| 2026-10-03 12:00 |
08:47:19.06 |
-03:05:35.4 |
HIP 43305 |
37.12 |
| 2026-10-04 00:00 |
08:47:21.63 |
-03:06:39.2 |
HIP 43305 |
36.00 |
| 2026-10-04 12:00 |
08:47:24.14 |
-03:07:43.0 |
HIP 43305 |
34.89 |
| 2026-10-05 00:00 |
08:47:26.58 |
-03:08:46.8 |
HIP 43305 |
33.81 |
| 2026-10-05 12:00 |
08:47:28.97 |
-03:09:50.5 |
HIP 43305 |
32.74 |
| 2026-10-06 00:00 |
08:47:31.30 |
-03:10:54.3 |
HIP 43305 |
31.71 |
| 2026-10-06 12:00 |
08:47:33.58 |
-03:11:58.0 |
HIP 43305 |
30.70 |
| 2026-10-07 00:00 |
08:47:35.79 |
-03:13:01.7 |
HIP 43305 |
29.71 |
| 2026-10-07 12:00 |
08:47:37.94 |
-03:14:05.4 |
HIP 43305 |
28.76 |
| 2026-10-08 00:00 |
08:47:40.03 |
-03:15:09.1 |
HIP 43305 |
27.84 |
| 2026-10-08 12:00 |
08:47:42.06 |
-03:16:12.7 |
HIP 43305 |
26.95 |
| 2026-10-09 00:00 |
08:47:44.02 |
-03:17:16.3 |
HIP 43305 |
26.10 |
| 2026-10-09 12:00 |
08:47:45.93 |
-03:18:19.8 |
HIP 43305 |
25.29 |
| 2026-10-10 00:00 |
08:47:47.77 |
-03:19:23.3 |
HIP 43305 |
24.53 |
| 2026-10-10 12:00 |
08:47:49.55 |
-03:20:26.7 |
HIP 43305 |
23.81 |
| 2026-10-11 00:00 |
08:47:51.27 |
-03:21:30.1 |
HIP 43305 |
23.14 |
| 2026-10-11 12:00 |
08:47:52.93 |
-03:22:33.4 |
HIP 43305 |
22.53 |
| 2026-10-12 00:00 |
08:47:54.52 |
-03:23:36.6 |
HIP 43305 |
21.97 |
| 2026-10-12 12:00 |
08:47:56.05 |
-03:24:39.8 |
HIP 43305 |
21.47 |
| 2026-10-13 00:00 |
08:47:57.51 |
-03:25:42.9 |
HIP 43305 |
21.04 |
| 2026-10-13 12:00 |
08:47:58.91 |
-03:26:46.0 |
HIP 43305 |
20.67 |
| 2026-10-14 00:00 |
08:48:00.25 |
-03:27:48.9 |
HIP 43305 |
20.37 |
| 2026-10-14 12:00 |
08:48:01.52 |
-03:28:51.8 |
HIP 43305 |
20.15 |
| 2026-10-15 00:00 |
08:48:02.72 |
-03:29:54.6 |
HIP 43305 |
20.00 |
| 2026-10-15 12:00 |
08:48:03.86 |
-03:30:57.3 |
HIP 43305 |
19.92 |
| 2026-10-16 00:00 |
08:48:04.94 |
-03:31:59.9 |
HIP 43305 |
19.92 |