C/2022 N2 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 N2 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-07-31T18:28:42.798720Z |
| Orbit solution date (soln_date, UTC) | 2026-04-30T15:12:15Z |
| Obs used | 3866 |
| 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) | 2025-04-17.0000000 |
| e | 1.00323743 |
| q (au) | 3.825530 |
| a (au) | -1181.657928 |
| i (deg) | 5.503042 |
| Ω (om, deg) | 319.741050 |
| ω (w, deg) | 75.389144 |
| M (ma, deg) | -0.002566 |
等級
散乱 + 全体線形
$$ M_a = (9.212 + 2.861\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.212 |
| 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 | -6.815 |
| 2023-07-16 | 2024-08-27 | +0.4719 | -0.297 |
| 2024-08-27 | 2025-07-31 | -2.4657 | +1.517 |
| 2025-07-31 | 2026-05-02 | -10.2167 | +6.029 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 05:00:30.43 | +26:38:26.7 | HIP 23349 | 12.58 |
| 2026-05-12 12:00 | 05:01:07.30 | +26:38:59.7 | HIP 23349 | 7.41 |
| 2026-05-13 00:00 | 05:01:44.17 | +26:39:32.3 | HIP 23402 | 0.69 |
| 2026-05-13 12:00 | 05:02:21.07 | +26:40:04.5 | HIP 23402 | 7.83 |
| 2026-05-14 00:00 | 05:02:57.98 | +26:40:36.4 | HIP 23402 | 16.09 |
| 2026-05-14 12:00 | 05:03:34.91 | +26:41:07.9 | HIP 23633 | 16.93 |
| 2026-05-15 00:00 | 05:04:11.85 | +26:41:39.0 | HIP 23633 | 8.70 |
| 2026-05-15 12:00 | 05:04:48.81 | +26:42:09.7 | HIP 23633 | 1.13 |
| 2026-05-16 00:00 | 05:05:25.78 | +26:42:40.0 | HIP 23633 | 7.98 |
| 2026-05-16 12:00 | 05:06:02.76 | +26:43:09.9 | HIP 23772 | 15.11 |
| 2026-05-17 00:00 | 05:06:39.75 | +26:43:39.5 | HIP 23772 | 13.99 |
| 2026-05-17 12:00 | 05:07:16.75 | +26:44:08.6 | HIP 23814 | 15.83 |
| 2026-05-18 00:00 | 05:07:53.77 | +26:44:37.3 | HIP 23814 | 18.62 |
| 2026-05-18 12:00 | 05:08:30.79 | +26:45:05.7 | HIP 24047 | 20.92 |
| 2026-05-19 00:00 | 05:09:07.82 | +26:45:33.6 | HIP 24047 | 12.66 |
| 2026-05-19 12:00 | 05:09:44.86 | +26:46:01.1 | HIP 24047 | 4.46 |
| 2026-05-20 00:00 | 05:10:21.90 | +26:46:28.3 | HIP 24047 | 4.08 |
| 2026-05-20 12:00 | 05:10:58.95 | +26:46:55.0 | HIP 24047 | 12.27 |
| 2026-05-21 00:00 | 05:11:36.01 | +26:47:21.3 | HIP 24047 | 20.54 |
| 2026-05-21 12:00 | 05:12:13.06 | +26:47:47.2 | HIP 24252 | 20.58 |
| 2026-05-22 00:00 | 05:12:50.13 | +26:48:12.7 | HIP 24252 | 21.87 |
| 2026-05-22 12:00 | 05:13:27.19 | +26:48:37.8 | HIP 24252 | 25.89 |
| 2026-05-23 00:00 | 05:14:04.26 | +26:49:02.5 | HIP 24370 | 25.72 |
| 2026-05-23 12:00 | 05:14:41.33 | +26:49:26.8 | HIP 24546 | 24.85 |
| 2026-05-24 00:00 | 05:15:18.40 | +26:49:50.6 | HIP 24546 | 19.81 |
| 2026-05-24 12:00 | 05:15:55.47 | +26:50:14.0 | HIP 24546 | 17.45 |
| 2026-05-25 00:00 | 05:16:32.53 | +26:50:37.1 | HIP 24581 | 15.95 |
| 2026-05-25 12:00 | 05:17:09.60 | +26:50:59.7 | HIP 24684 | 9.44 |
| 2026-05-26 00:00 | 05:17:46.66 | +26:51:21.8 | HIP 24684 | 6.58 |
| 2026-05-26 12:00 | 05:18:23.73 | +26:51:43.6 | HIP 24684 | 11.60 |
| 2026-05-27 00:00 | 05:19:00.79 | +26:52:04.9 | HIP 24869 | 17.38 |
| 2026-05-27 12:00 | 05:19:37.84 | +26:52:25.8 | HIP 24869 | 12.98 |
| 2026-05-28 00:00 | 05:20:14.89 | +26:52:46.3 | HIP 24869 | 13.10 |
| 2026-05-28 12:00 | 05:20:51.94 | +26:53:06.4 | HIP 24869 | 17.65 |
| 2026-05-29 00:00 | 05:21:28.98 | +26:53:26.0 | HIP 25159 | 22.56 |
| 2026-05-29 12:00 | 05:22:06.01 | +26:53:45.3 | HIP 25159 | 15.28 |
| 2026-05-30 00:00 | 05:22:43.04 | +26:54:04.1 | HIP 25159 | 9.72 |
| 2026-05-30 12:00 | 05:23:20.06 | +26:54:22.4 | HIP 25159 | 9.58 |
| 2026-05-31 00:00 | 05:23:57.07 | +26:54:40.4 | HIP 25159 | 15.02 |
| 2026-05-31 12:00 | 05:24:34.07 | +26:54:57.9 | HIP 25159 | 22.26 |
| 2026-06-01 00:00 | 05:25:11.07 | +26:55:15.0 | HIP 25450 | 19.81 |
| 2026-06-01 12:00 | 05:25:48.05 | +26:55:31.6 | HIP 25450 | 11.85 |
| 2026-06-02 00:00 | 05:26:25.03 | +26:55:47.9 | HIP 25450 | 4.97 |