メタデータ
| 項目 |
値 |
| Designation |
C/2022 L4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-12-08T15:04:17.385600Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:55Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-06-04T09:30:37.209600Z |
| Discovery magnitude (MPC) |
21.40 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-06-12.0000000 |
| e |
0.98813992 |
| q (au) |
3.014561 |
| a (au) |
254.177194 |
| i (deg) |
141.223705 |
| Ω (om, deg) |
66.051128 |
| ω (w, deg) |
125.300473 |
| M (ma, deg) |
0.045086 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-0.841 |
| k |
0.937 |
| 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) |
| 2026-06-01 00:00 |
10:48:47.50 |
-32:20:24.9 |
HIP 53048 |
31.25 |
| 2026-06-01 12:00 |
10:48:45.58 |
-32:18:49.4 |
HIP 53048 |
31.97 |
| 2026-06-02 00:00 |
10:48:43.75 |
-32:17:14.3 |
HIP 53048 |
32.73 |
| 2026-06-02 12:00 |
10:48:42.00 |
-32:15:39.8 |
HIP 53048 |
33.53 |
| 2026-06-03 00:00 |
10:48:40.35 |
-32:14:05.7 |
HIP 52841 |
33.29 |
| 2026-06-03 12:00 |
10:48:38.79 |
-32:12:32.1 |
HIP 52841 |
31.70 |
| 2026-06-04 00:00 |
10:48:37.31 |
-32:10:59.1 |
HIP 52841 |
30.12 |
| 2026-06-04 12:00 |
10:48:35.93 |
-32:09:26.5 |
HIP 52841 |
28.55 |
| 2026-06-05 00:00 |
10:48:34.63 |
-32:07:54.5 |
HIP 52841 |
26.99 |
| 2026-06-05 12:00 |
10:48:33.42 |
-32:06:23.0 |
HIP 52841 |
25.44 |
| 2026-06-06 00:00 |
10:48:32.30 |
-32:04:52.0 |
HIP 52841 |
23.91 |
| 2026-06-06 12:00 |
10:48:31.26 |
-32:03:21.5 |
HIP 52841 |
22.39 |
| 2026-06-07 00:00 |
10:48:30.31 |
-32:01:51.6 |
HIP 52841 |
20.87 |
| 2026-06-07 12:00 |
10:48:29.45 |
-32:00:22.2 |
HIP 52841 |
19.37 |
| 2026-06-08 00:00 |
10:48:28.68 |
-31:58:53.4 |
HIP 52841 |
17.89 |
| 2026-06-08 12:00 |
10:48:27.99 |
-31:57:25.1 |
HIP 52841 |
16.41 |
| 2026-06-09 00:00 |
10:48:27.38 |
-31:55:57.4 |
HIP 52841 |
14.95 |
| 2026-06-09 12:00 |
10:48:26.87 |
-31:54:30.2 |
HIP 52841 |
13.51 |
| 2026-06-10 00:00 |
10:48:26.43 |
-31:53:03.7 |
HIP 52841 |
12.08 |
| 2026-06-10 12:00 |
10:48:26.08 |
-31:51:37.6 |
HIP 52841 |
10.66 |
| 2026-06-11 00:00 |
10:48:25.82 |
-31:50:12.2 |
HIP 52841 |
9.27 |
| 2026-06-11 12:00 |
10:48:25.64 |
-31:48:47.3 |
HIP 52841 |
7.91 |
| 2026-06-12 00:00 |
10:48:25.54 |
-31:47:23.0 |
HIP 52841 |
6.58 |
| 2026-06-12 12:00 |
10:48:25.53 |
-31:45:59.4 |
HIP 52841 |
5.30 |
| 2026-06-13 00:00 |
10:48:25.60 |
-31:44:36.3 |
HIP 52841 |
4.13 |
| 2026-06-13 12:00 |
10:48:25.76 |
-31:43:13.8 |
HIP 52841 |
3.15 |
| 2026-06-14 00:00 |
10:48:25.99 |
-31:41:51.9 |
HIP 52841 |
2.59 |
| 2026-06-14 12:00 |
10:48:26.31 |
-31:40:30.6 |
HIP 52841 |
2.70 |
| 2026-06-15 00:00 |
10:48:26.71 |
-31:39:10.0 |
HIP 52841 |
3.40 |
| 2026-06-15 12:00 |
10:48:27.19 |
-31:37:50.0 |
HIP 52841 |
4.42 |
| 2026-06-16 00:00 |
10:48:27.75 |
-31:36:30.6 |
HIP 52841 |
5.57 |
| 2026-06-16 12:00 |
10:48:28.39 |
-31:35:11.8 |
HIP 52841 |
6.79 |
| 2026-06-17 00:00 |
10:48:29.11 |
-31:33:53.7 |
HIP 52841 |
8.04 |
| 2026-06-17 12:00 |
10:48:29.91 |
-31:32:36.1 |
HIP 52841 |
9.30 |
| 2026-06-18 00:00 |
10:48:30.79 |
-31:31:19.3 |
HIP 52841 |
10.56 |
| 2026-06-18 12:00 |
10:48:31.75 |
-31:30:03.1 |
HIP 52841 |
11.83 |
| 2026-06-19 00:00 |
10:48:32.79 |
-31:28:47.5 |
HIP 52841 |
13.10 |
| 2026-06-19 12:00 |
10:48:33.90 |
-31:27:32.6 |
HIP 52841 |
14.36 |
| 2026-06-20 00:00 |
10:48:35.09 |
-31:26:18.3 |
HIP 52950 |
15.29 |
| 2026-06-20 12:00 |
10:48:36.36 |
-31:25:04.7 |
HIP 52950 |
14.95 |
| 2026-06-21 00:00 |
10:48:37.70 |
-31:23:51.8 |
HIP 52950 |
14.70 |
| 2026-06-21 12:00 |
10:48:39.12 |
-31:22:39.5 |
HIP 52950 |
14.53 |
| 2026-06-22 00:00 |
10:48:40.61 |
-31:21:27.8 |
HIP 52950 |
14.45 |