C/2022 N2 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 N2 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-07-31T18:25:11.481600Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T09:42:18Z |
| Obs used | 3823 |
| NEO | - |
| M1 | 9.100 |
| K1 | 5.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-07-04T10:42:53.971200Z |
| Discovery magnitude (MPC) | 20.66 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) | 2025-04-12.0000000 |
| e | 1.00324081 |
| q (au) | 3.825535 |
| a (au) | -1180.426361 |
| i (deg) | 5.503050 |
| Ω (om, deg) | 319.741140 |
| ω (w, deg) | 75.388635 |
| M (ma, deg) | -0.002692 |
等級
散乱 + 全体線形
$$ M_a = (9.214 + 2.861\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.214 |
| n | 2.861 |
| gf | 1.000 |
| gb | -0.573 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2022-06-02 | 2023-07-16 | +8.1960 | -6.817 |
| 2023-07-16 | 2024-08-27 | +0.4720 | -0.298 |
| 2024-08-27 | 2025-07-31 | -2.4635 | +1.514 |
| 2025-07-31 | 2026-03-22 | -13.0617 | +7.730 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 04:05:43.86 | +25:26:21.7 | HIP 18996 | 20.89 |
| 2026-03-26 12:00 | 04:06:15.82 | +25:27:14.2 | HIP 19182 | 17.10 |
| 2026-03-27 00:00 | 04:06:47.88 | +25:28:06.8 | HIP 19182 | 15.29 |
| 2026-03-27 12:00 | 04:07:20.02 | +25:28:59.3 | HIP 19182 | 16.77 |
| 2026-03-28 00:00 | 04:07:52.25 | +25:29:51.9 | HIP 19182 | 20.89 |
| 2026-03-28 12:00 | 04:08:24.57 | +25:30:44.4 | HIP 19341 | 22.17 |
| 2026-03-29 00:00 | 04:08:56.98 | +25:31:37.0 | HIP 19341 | 21.44 |
| 2026-03-29 12:00 | 04:09:29.47 | +25:32:29.5 | HIP 19496 | 18.44 |
| 2026-03-30 00:00 | 04:10:02.04 | +25:33:22.0 | HIP 19496 | 13.90 |
| 2026-03-30 12:00 | 04:10:34.70 | +25:34:14.5 | HIP 19496 | 12.49 |
| 2026-03-31 00:00 | 04:11:07.44 | +25:35:07.0 | HIP 19496 | 15.14 |
| 2026-03-31 12:00 | 04:11:40.27 | +25:35:59.5 | HIP 19496 | 20.34 |
| 2026-04-01 00:00 | 04:12:13.17 | +25:36:51.9 | HIP 19583 | 22.83 |
| 2026-04-01 12:00 | 04:12:46.15 | +25:37:44.2 | HIP 19583 | 24.88 |
| 2026-04-02 00:00 | 04:13:19.21 | +25:38:36.5 | HIP 19637 | 26.64 |
| 2026-04-02 12:00 | 04:13:52.35 | +25:39:28.8 | HIP 19637 | 29.87 |
| 2026-04-03 00:00 | 04:14:25.57 | +25:40:21.0 | HIP 19902 | 25.34 |
| 2026-04-03 12:00 | 04:14:58.87 | +25:41:13.1 | HIP 19902 | 19.00 |
| 2026-04-04 00:00 | 04:15:32.24 | +25:42:05.1 | HIP 19902 | 13.94 |
| 2026-04-04 12:00 | 04:16:05.68 | +25:42:57.1 | HIP 19902 | 11.92 |
| 2026-04-05 00:00 | 04:16:39.20 | +25:43:49.0 | HIP 19902 | 14.32 |
| 2026-04-05 12:00 | 04:17:12.80 | +25:44:40.8 | HIP 19902 | 19.61 |
| 2026-04-06 00:00 | 04:17:46.46 | +25:45:32.5 | HIP 19902 | 26.09 |
| 2026-04-06 12:00 | 04:18:20.20 | +25:46:24.1 | HIP 20258 | 29.48 |
| 2026-04-07 00:00 | 04:18:54.01 | +25:47:15.6 | HIP 20258 | 21.82 |
| 2026-04-07 12:00 | 04:19:27.89 | +25:48:07.0 | HIP 20258 | 14.14 |
| 2026-04-08 00:00 | 04:20:01.84 | +25:48:58.3 | HIP 20258 | 6.46 |
| 2026-04-08 12:00 | 04:20:35.86 | +25:49:49.5 | HIP 20258 | 1.25 |
| 2026-04-09 00:00 | 04:21:09.95 | +25:50:40.5 | HIP 20258 | 8.96 |
| 2026-04-09 12:00 | 04:21:44.11 | +25:51:31.4 | HIP 20258 | 16.70 |
| 2026-04-10 00:00 | 04:22:18.33 | +25:52:22.2 | HIP 20430 | 15.08 |
| 2026-04-10 12:00 | 04:22:52.62 | +25:53:12.8 | HIP 20430 | 15.96 |
| 2026-04-11 00:00 | 04:23:26.97 | +25:54:03.3 | HIP 20430 | 20.07 |
| 2026-04-11 12:00 | 04:24:01.39 | +25:54:53.7 | HIP 20626 | 18.51 |
| 2026-04-12 00:00 | 04:24:35.87 | +25:55:43.8 | HIP 20626 | 13.34 |
| 2026-04-12 12:00 | 04:25:10.42 | +25:56:33.9 | HIP 20626 | 11.61 |
| 2026-04-13 00:00 | 04:25:45.03 | +25:57:23.7 | HIP 20626 | 14.63 |
| 2026-04-13 12:00 | 04:26:19.70 | +25:58:13.4 | HIP 20777 | 18.58 |
| 2026-04-14 00:00 | 04:26:54.43 | +25:59:02.9 | HIP 20777 | 16.78 |
| 2026-04-14 12:00 | 04:27:29.22 | +25:59:52.3 | HIP 20777 | 18.48 |
| 2026-04-15 00:00 | 04:28:04.07 | +26:00:41.4 | HIP 20895 | 14.87 |
| 2026-04-15 12:00 | 04:28:38.97 | +26:01:30.4 | HIP 20895 | 11.70 |
| 2026-04-16 00:00 | 04:29:13.94 | +26:02:19.2 | HIP 20895 | 13.32 |