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) |
| 2026-07-29 00:00 |
10:53:26.00 |
-30:25:55.0 |
HIP 53372 |
19.13 |
| 2026-07-29 12:00 |
10:53:31.75 |
-30:25:37.4 |
HIP 53372 |
17.86 |
| 2026-07-30 00:00 |
10:53:37.53 |
-30:25:20.6 |
HIP 53372 |
16.59 |
| 2026-07-30 12:00 |
10:53:43.36 |
-30:25:04.4 |
HIP 53372 |
15.31 |
| 2026-07-31 00:00 |
10:53:49.22 |
-30:24:49.0 |
HIP 53372 |
14.04 |
| 2026-07-31 12:00 |
10:53:55.12 |
-30:24:34.3 |
HIP 53372 |
12.76 |
| 2026-08-01 00:00 |
10:54:01.05 |
-30:24:20.3 |
HIP 53372 |
11.48 |
| 2026-08-01 12:00 |
10:54:07.02 |
-30:24:07.1 |
HIP 53372 |
10.21 |
| 2026-08-02 00:00 |
10:54:13.02 |
-30:23:54.6 |
HIP 53372 |
8.94 |
| 2026-08-02 12:00 |
10:54:19.06 |
-30:23:42.8 |
HIP 53372 |
7.69 |
| 2026-08-03 00:00 |
10:54:25.13 |
-30:23:31.7 |
HIP 53372 |
6.46 |
| 2026-08-03 12:00 |
10:54:31.24 |
-30:23:21.4 |
HIP 53372 |
5.28 |
| 2026-08-04 00:00 |
10:54:37.37 |
-30:23:11.7 |
HIP 53372 |
4.20 |
| 2026-08-04 12:00 |
10:54:43.54 |
-30:23:02.8 |
HIP 53372 |
3.31 |
| 2026-08-05 00:00 |
10:54:49.74 |
-30:22:54.6 |
HIP 53372 |
2.82 |
| 2026-08-05 12:00 |
10:54:55.98 |
-30:22:47.1 |
HIP 53372 |
2.94 |
| 2026-08-06 00:00 |
10:55:02.24 |
-30:22:40.4 |
HIP 53372 |
3.61 |
| 2026-08-06 12:00 |
10:55:08.53 |
-30:22:34.3 |
HIP 53372 |
4.61 |
| 2026-08-07 00:00 |
10:55:14.86 |
-30:22:29.0 |
HIP 53372 |
5.77 |
| 2026-08-07 12:00 |
10:55:21.21 |
-30:22:24.4 |
HIP 53372 |
7.02 |
| 2026-08-08 00:00 |
10:55:27.59 |
-30:22:20.5 |
HIP 53372 |
8.31 |
| 2026-08-08 12:00 |
10:55:34.00 |
-30:22:17.3 |
HIP 53372 |
9.64 |
| 2026-08-09 00:00 |
10:55:40.44 |
-30:22:14.9 |
HIP 53372 |
10.99 |
| 2026-08-09 12:00 |
10:55:46.91 |
-30:22:13.1 |
HIP 53372 |
12.35 |
| 2026-08-10 00:00 |
10:55:53.40 |
-30:22:12.1 |
HIP 53372 |
13.73 |
| 2026-08-10 12:00 |
10:55:59.92 |
-30:22:11.8 |
HIP 53372 |
15.12 |
| 2026-08-11 00:00 |
10:56:06.46 |
-30:22:12.1 |
HIP 53372 |
16.52 |
| 2026-08-11 12:00 |
10:56:13.03 |
-30:22:13.2 |
HIP 53372 |
17.93 |
| 2026-08-12 00:00 |
10:56:19.63 |
-30:22:15.0 |
HIP 53579 |
18.41 |
| 2026-08-12 12:00 |
10:56:26.25 |
-30:22:17.5 |
HIP 53579 |
17.10 |
| 2026-08-13 00:00 |
10:56:32.89 |
-30:22:20.7 |
HIP 53579 |
15.82 |
| 2026-08-13 12:00 |
10:56:39.55 |
-30:22:24.6 |
HIP 53579 |
14.56 |
| 2026-08-14 00:00 |
10:56:46.24 |
-30:22:29.2 |
HIP 53579 |
13.34 |
| 2026-08-14 12:00 |
10:56:52.95 |
-30:22:34.5 |
HIP 53579 |
12.17 |
| 2026-08-15 00:00 |
10:56:59.68 |
-30:22:40.5 |
HIP 53579 |
11.08 |
| 2026-08-15 12:00 |
10:57:06.43 |
-30:22:47.2 |
HIP 53579 |
10.08 |
| 2026-08-16 00:00 |
10:57:13.20 |
-30:22:54.6 |
HIP 53579 |
9.21 |
| 2026-08-16 12:00 |
10:57:20.00 |
-30:23:02.7 |
HIP 53579 |
8.52 |
| 2026-08-17 00:00 |
10:57:26.81 |
-30:23:11.4 |
HIP 53579 |
8.05 |
| 2026-08-17 12:00 |
10:57:33.63 |
-30:23:20.9 |
HIP 53579 |
7.84 |
| 2026-08-18 00:00 |
10:57:40.48 |
-30:23:31.0 |
HIP 53579 |
7.93 |
| 2026-08-18 12:00 |
10:57:47.34 |
-30:23:41.8 |
HIP 53579 |
8.29 |
| 2026-08-19 00:00 |
10:57:54.22 |
-30:23:53.3 |
HIP 53579 |
8.91 |