メタデータ
| 項目 |
値 |
| Designation |
P/2021 P3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-05-31T00:59:23.956800Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:58Z |
| Obs used |
104 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-08-11T14:01:45.033600Z |
| Discovery magnitude (MPC) |
20.63 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-09-09.0000000 |
| e |
0.34046368 |
| q (au) |
2.916288 |
| a (au) |
4.421724 |
| i (deg) |
27.156308 |
| Ω (om, deg) |
358.237092 |
| ω (w, deg) |
334.236786 |
| M (ma, deg) |
10.701892 |
等級
散乱 + 全体線形
$$
M_a = (14.341 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.341 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.755 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
10:38:26.47 |
+21:04:50.1 |
HIP 51964 |
22.07 |
| 2026-03-26 12:00 |
10:38:11.23 |
+21:04:45.8 |
HIP 51964 |
18.77 |
| 2026-03-27 00:00 |
10:37:56.12 |
+21:04:40.3 |
HIP 51964 |
15.59 |
| 2026-03-27 12:00 |
10:37:41.13 |
+21:04:33.7 |
HIP 51964 |
12.62 |
| 2026-03-28 00:00 |
10:37:26.26 |
+21:04:25.9 |
HIP 51964 |
9.99 |
| 2026-03-28 12:00 |
10:37:11.51 |
+21:04:16.9 |
HIP 51964 |
8.03 |
| 2026-03-29 00:00 |
10:36:56.88 |
+21:04:06.7 |
HIP 51964 |
7.24 |
| 2026-03-29 12:00 |
10:36:42.39 |
+21:03:55.4 |
HIP 51964 |
7.96 |
| 2026-03-30 00:00 |
10:36:28.02 |
+21:03:43.0 |
HIP 51964 |
9.83 |
| 2026-03-30 12:00 |
10:36:13.78 |
+21:03:29.3 |
HIP 51964 |
12.31 |
| 2026-03-31 00:00 |
10:35:59.68 |
+21:03:14.5 |
HIP 51964 |
15.08 |
| 2026-03-31 12:00 |
10:35:45.70 |
+21:02:58.6 |
HIP 51964 |
18.00 |
| 2026-04-01 00:00 |
10:35:31.86 |
+21:02:41.4 |
HIP 51826 |
20.33 |
| 2026-04-01 12:00 |
10:35:18.16 |
+21:02:23.2 |
HIP 51826 |
20.35 |
| 2026-04-02 00:00 |
10:35:04.60 |
+21:02:03.7 |
HIP 51826 |
20.89 |
| 2026-04-02 12:00 |
10:34:51.17 |
+21:01:43.2 |
HIP 51826 |
21.89 |
| 2026-04-03 00:00 |
10:34:37.88 |
+21:01:21.4 |
HIP 51826 |
23.28 |
| 2026-04-03 12:00 |
10:34:24.74 |
+21:00:58.6 |
HIP 51641 |
20.68 |
| 2026-04-04 00:00 |
10:34:11.74 |
+21:00:34.5 |
HIP 51641 |
17.78 |
| 2026-04-04 12:00 |
10:33:58.88 |
+21:00:09.4 |
HIP 51641 |
14.98 |
| 2026-04-05 00:00 |
10:33:46.17 |
+20:59:43.1 |
HIP 51641 |
12.29 |
| 2026-04-05 12:00 |
10:33:33.60 |
+20:59:15.6 |
HIP 51641 |
9.81 |
| 2026-04-06 00:00 |
10:33:21.19 |
+20:58:47.0 |
HIP 51641 |
7.67 |
| 2026-04-06 12:00 |
10:33:08.92 |
+20:58:17.3 |
HIP 51641 |
6.21 |
| 2026-04-07 00:00 |
10:32:56.81 |
+20:57:46.5 |
HIP 51641 |
5.90 |
| 2026-04-07 12:00 |
10:32:44.84 |
+20:57:14.5 |
HIP 51641 |
6.87 |
| 2026-04-08 00:00 |
10:32:33.03 |
+20:56:41.4 |
HIP 51641 |
8.66 |
| 2026-04-08 12:00 |
10:32:21.37 |
+20:56:07.1 |
HIP 51641 |
10.85 |
| 2026-04-09 00:00 |
10:32:09.87 |
+20:55:31.8 |
HIP 51641 |
13.22 |
| 2026-04-09 12:00 |
10:31:58.53 |
+20:54:55.3 |
HIP 51641 |
15.68 |
| 2026-04-10 00:00 |
10:31:47.34 |
+20:54:17.7 |
HIP 51641 |
18.18 |
| 2026-04-10 12:00 |
10:31:36.31 |
+20:53:39.0 |
HIP 51641 |
20.68 |
| 2026-04-11 00:00 |
10:31:25.44 |
+20:52:59.2 |
HIP 51419 |
19.12 |
| 2026-04-11 12:00 |
10:31:14.73 |
+20:52:18.3 |
HIP 51419 |
16.53 |
| 2026-04-12 00:00 |
10:31:04.19 |
+20:51:36.3 |
HIP 51419 |
13.97 |
| 2026-04-12 12:00 |
10:30:53.80 |
+20:50:53.2 |
HIP 51419 |
11.44 |
| 2026-04-13 00:00 |
10:30:43.58 |
+20:50:09.0 |
HIP 51419 |
8.95 |
| 2026-04-13 12:00 |
10:30:33.53 |
+20:49:23.7 |
HIP 51419 |
6.49 |
| 2026-04-14 00:00 |
10:30:23.64 |
+20:48:37.3 |
HIP 51419 |
4.08 |
| 2026-04-14 12:00 |
10:30:13.91 |
+20:47:49.9 |
HIP 51419 |
1.79 |
| 2026-04-15 00:00 |
10:30:04.36 |
+20:47:01.3 |
HIP 51419 |
1.15 |
| 2026-04-15 12:00 |
10:29:54.97 |
+20:46:11.7 |
HIP 51419 |
3.26 |
| 2026-04-16 00:00 |
10:29:45.75 |
+20:45:21.0 |
HIP 51404 |
5.43 |