C/2022 A2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2022 A2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-02-18T06:27:19.474560Z |
| Orbit solution date (soln_date, UTC) |
2024-08-02T01:42:20Z |
| Obs used |
2731 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
11.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-01-10T14:49:09.494400Z |
| Discovery magnitude (MPC) |
20.51 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) |
2023-04-25.0000000 |
| e |
1.00038112 |
| q (au) |
1.735334 |
| a (au) |
-4553.263121 |
| i (deg) |
108.146714 |
| Ω (om, deg) |
171.579526 |
| ω (w, deg) |
88.367878 |
| M (ma, deg) |
0.000211 |
等級
散乱 + 全体線形
$$
M_a = (5.801 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.801 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.799 |
| k |
0.997 |
| 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 |
| 2022-01-09 |
2023-02-17 |
+2.8428 |
-1.507 |
| 2023-02-18 |
2023-08-21 |
+5.3739 |
-2.712 |
| 2023-08-21 |
2024-08-01 |
-4.1064 |
+1.363 |
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 |
23:29:28.10 |
-41:04:00.9 |
HIP 116103 |
23.63 |
| 2026-02-03 12:00 |
23:29:39.16 |
-41:02:49.6 |
HIP 116103 |
21.35 |
| 2026-02-04 00:00 |
23:29:50.28 |
-41:01:38.7 |
HIP 116103 |
19.08 |
| 2026-02-04 12:00 |
23:30:01.44 |
-41:00:28.3 |
HIP 116103 |
16.84 |
| 2026-02-05 00:00 |
23:30:12.66 |
-40:59:18.3 |
HIP 116103 |
14.65 |
| 2026-02-05 12:00 |
23:30:23.93 |
-40:58:08.7 |
HIP 116103 |
12.53 |
| 2026-02-06 00:00 |
23:30:35.24 |
-40:56:59.6 |
HIP 116103 |
10.52 |
| 2026-02-06 12:00 |
23:30:46.61 |
-40:55:51.0 |
HIP 116103 |
8.73 |
| 2026-02-07 00:00 |
23:30:58.02 |
-40:54:42.8 |
HIP 116103 |
7.29 |
| 2026-02-07 12:00 |
23:31:09.48 |
-40:53:35.1 |
HIP 116103 |
6.47 |
| 2026-02-08 00:00 |
23:31:20.99 |
-40:52:27.9 |
HIP 116103 |
6.51 |
| 2026-02-08 12:00 |
23:31:32.54 |
-40:51:21.2 |
HIP 116103 |
7.39 |
| 2026-02-09 00:00 |
23:31:44.14 |
-40:50:14.9 |
HIP 116103 |
8.88 |
| 2026-02-09 12:00 |
23:31:55.78 |
-40:49:09.1 |
HIP 116103 |
10.73 |
| 2026-02-10 00:00 |
23:32:07.47 |
-40:48:03.9 |
HIP 116241 |
12.48 |
| 2026-02-10 12:00 |
23:32:19.20 |
-40:46:59.1 |
HIP 116241 |
10.65 |
| 2026-02-11 00:00 |
23:32:30.97 |
-40:45:54.8 |
HIP 116241 |
9.12 |
| 2026-02-11 12:00 |
23:32:42.78 |
-40:44:51.0 |
HIP 116241 |
8.05 |
| 2026-02-12 00:00 |
23:32:54.64 |
-40:43:47.8 |
HIP 116241 |
7.66 |
| 2026-02-12 12:00 |
23:33:06.54 |
-40:42:45.0 |
HIP 116241 |
8.04 |
| 2026-02-13 00:00 |
23:33:18.47 |
-40:41:42.8 |
HIP 116241 |
9.10 |
| 2026-02-13 12:00 |
23:33:30.45 |
-40:40:41.1 |
HIP 116241 |
10.63 |
| 2026-02-14 00:00 |
23:33:42.46 |
-40:39:39.9 |
HIP 116241 |
12.48 |
| 2026-02-14 12:00 |
23:33:54.51 |
-40:38:39.3 |
HIP 116241 |
14.52 |
| 2026-02-15 00:00 |
23:34:06.60 |
-40:37:39.2 |
HIP 116241 |
16.68 |
| 2026-02-15 12:00 |
23:34:18.72 |
-40:36:39.7 |
HIP 116241 |
18.92 |
| 2026-02-16 00:00 |
23:34:30.88 |
-40:35:40.7 |
HIP 116487 |
20.56 |
| 2026-02-16 12:00 |
23:34:43.07 |
-40:34:42.3 |
HIP 116487 |
18.08 |
| 2026-02-17 00:00 |
23:34:55.30 |
-40:33:44.4 |
HIP 116487 |
15.62 |
| 2026-02-17 12:00 |
23:35:07.56 |
-40:32:47.1 |
HIP 116487 |
13.17 |
| 2026-02-18 00:00 |
23:35:19.86 |
-40:31:50.4 |
HIP 116487 |
10.74 |
| 2026-02-18 12:00 |
23:35:32.18 |
-40:30:54.2 |
HIP 116487 |
8.37 |
| 2026-02-19 00:00 |
23:35:44.53 |
-40:29:58.6 |
HIP 116487 |
6.10 |
| 2026-02-19 12:00 |
23:35:56.92 |
-40:29:03.7 |
HIP 116487 |
4.12 |
| 2026-02-20 00:00 |
23:36:09.33 |
-40:28:09.3 |
HIP 116487 |
3.08 |
| 2026-02-20 12:00 |
23:36:21.78 |
-40:27:15.5 |
HIP 116487 |
3.84 |
| 2026-02-21 00:00 |
23:36:34.25 |
-40:26:22.3 |
HIP 116487 |
5.72 |
| 2026-02-21 12:00 |
23:36:46.75 |
-40:25:29.7 |
HIP 116487 |
7.97 |
| 2026-02-22 00:00 |
23:36:59.27 |
-40:24:37.7 |
HIP 116487 |
10.35 |
| 2026-02-22 12:00 |
23:37:11.82 |
-40:23:46.3 |
HIP 116487 |
12.79 |
| 2026-02-23 00:00 |
23:37:24.39 |
-40:22:55.5 |
HIP 116487 |
15.26 |
| 2026-02-23 12:00 |
23:37:36.99 |
-40:22:05.4 |
HIP 116487 |
17.74 |
| 2026-02-24 00:00 |
23:37:49.61 |
-40:21:15.9 |
HIP 116501 |
19.42 |