400P/PANSTARRS
メタデータ
| 項目 |
値 |
| Designation |
400P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-02-09T22:37:16.553280Z |
| Orbit solution date (soln_date, UTC) |
2024-10-05T23:12:48Z |
| Obs used |
414 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
12.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-10T09:07:24.096000Z |
| Discovery magnitude (MPC) |
19.20 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-02-27.0000000 |
| e |
0.40901297 |
| q (au) |
2.104108 |
| a (au) |
3.560329 |
| i (deg) |
10.926393 |
| Ω (om, deg) |
176.405371 |
| ω (w, deg) |
238.711384 |
| M (ma, deg) |
308.805563 |
等級
散乱 + 全体線形
$$
M_a = (11.776 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.776 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2020-06-01 |
2020-08-29 |
+19.2128 |
-6.748 |
| 2020-08-29 |
2021-02-07 |
+8.6813 |
-3.045 |
| 2021-02-10 |
2022-02-24 |
+1.7883 |
-1.680 |
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 |
19:08:10.37 |
-13:38:43.3 |
HIP 93895 |
14.57 |
| 2026-02-03 12:00 |
19:08:42.38 |
-13:37:34.0 |
HIP 94107 |
14.39 |
| 2026-02-04 00:00 |
19:09:14.36 |
-13:36:24.1 |
HIP 94107 |
9.32 |
| 2026-02-04 12:00 |
19:09:46.29 |
-13:35:13.5 |
HIP 94107 |
9.48 |
| 2026-02-05 00:00 |
19:10:18.18 |
-13:34:02.2 |
HIP 94107 |
14.69 |
| 2026-02-05 12:00 |
19:10:50.03 |
-13:32:50.4 |
HIP 94107 |
21.54 |
| 2026-02-06 00:00 |
19:11:21.83 |
-13:31:37.9 |
HIP 94107 |
28.89 |
| 2026-02-06 12:00 |
19:11:53.59 |
-13:30:24.7 |
HIP 94265 |
33.74 |
| 2026-02-07 00:00 |
19:12:25.30 |
-13:29:11.0 |
HIP 94265 |
37.80 |
| 2026-02-07 12:00 |
19:12:56.96 |
-13:27:56.6 |
HIP 94500 |
37.66 |
| 2026-02-08 00:00 |
19:13:28.58 |
-13:26:41.6 |
HIP 94500 |
36.46 |
| 2026-02-08 12:00 |
19:14:00.15 |
-13:25:26.0 |
HIP 94500 |
36.91 |
| 2026-02-09 00:00 |
19:14:31.66 |
-13:24:09.8 |
HIP 94559 |
36.20 |
| 2026-02-09 12:00 |
19:15:03.13 |
-13:22:52.9 |
HIP 94559 |
35.32 |
| 2026-02-10 00:00 |
19:15:34.55 |
-13:21:35.5 |
HIP 94731 |
34.62 |
| 2026-02-10 12:00 |
19:16:05.91 |
-13:20:17.4 |
HIP 94731 |
30.96 |
| 2026-02-11 00:00 |
19:16:37.22 |
-13:18:58.7 |
HIP 94731 |
28.95 |
| 2026-02-11 12:00 |
19:17:08.48 |
-13:17:39.5 |
HIP 94731 |
28.93 |
| 2026-02-12 00:00 |
19:17:39.69 |
-13:16:19.6 |
HIP 94731 |
30.88 |
| 2026-02-12 12:00 |
19:18:10.84 |
-13:14:59.2 |
HIP 95061 |
33.90 |
| 2026-02-13 00:00 |
19:18:41.93 |
-13:13:38.1 |
HIP 95061 |
26.37 |
| 2026-02-13 12:00 |
19:19:12.96 |
-13:12:16.5 |
HIP 95061 |
18.99 |
| 2026-02-14 00:00 |
19:19:43.94 |
-13:10:54.3 |
HIP 95061 |
12.00 |
| 2026-02-14 12:00 |
19:20:14.86 |
-13:09:31.5 |
HIP 95061 |
6.70 |
| 2026-02-15 00:00 |
19:20:45.71 |
-13:08:08.2 |
HIP 95061 |
7.92 |
| 2026-02-15 12:00 |
19:21:16.51 |
-13:06:44.2 |
HIP 95136 |
1.59 |
| 2026-02-16 00:00 |
19:21:47.25 |
-13:05:19.8 |
HIP 95136 |
7.39 |
| 2026-02-16 12:00 |
19:22:17.92 |
-13:03:54.7 |
HIP 95136 |
14.91 |
| 2026-02-17 00:00 |
19:22:48.53 |
-13:02:29.1 |
HIP 95317 |
16.99 |
| 2026-02-17 12:00 |
19:23:19.07 |
-13:01:02.9 |
HIP 95317 |
14.99 |
| 2026-02-18 00:00 |
19:23:49.55 |
-12:59:36.2 |
HIP 95317 |
16.61 |
| 2026-02-18 12:00 |
19:24:19.96 |
-12:58:09.0 |
HIP 95424 |
17.93 |
| 2026-02-19 00:00 |
19:24:50.31 |
-12:56:41.2 |
HIP 95424 |
15.88 |
| 2026-02-19 12:00 |
19:25:20.59 |
-12:55:12.9 |
HIP 95424 |
17.21 |
| 2026-02-20 00:00 |
19:25:50.79 |
-12:53:44.0 |
HIP 95579 |
16.74 |
| 2026-02-20 12:00 |
19:26:20.93 |
-12:52:14.6 |
HIP 95579 |
15.75 |
| 2026-02-21 00:00 |
19:26:51.00 |
-12:50:44.7 |
HIP 95579 |
18.11 |
| 2026-02-21 12:00 |
19:27:20.99 |
-12:49:14.3 |
HIP 95579 |
22.80 |
| 2026-02-22 00:00 |
19:27:50.92 |
-12:47:43.4 |
HIP 95847 |
27.55 |
| 2026-02-22 12:00 |
19:28:20.76 |
-12:46:12.0 |
HIP 95847 |
20.19 |
| 2026-02-23 00:00 |
19:28:50.54 |
-12:44:40.0 |
HIP 95847 |
12.93 |
| 2026-02-23 12:00 |
19:29:20.24 |
-12:43:07.6 |
HIP 95847 |
6.09 |
| 2026-02-24 00:00 |
19:29:49.86 |
-12:41:34.7 |
HIP 95847 |
4.05 |