C/2022 V2 (Lemmon)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 V2 (Lemmon) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2023-11-01T22:13:51.689280Z |
| Orbit solution date (soln_date, UTC) | 2024-06-06T23:12:25Z |
| Obs used | 717 |
| NEO | - |
| M1 | 14.700 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-11-02T01:32:56.688000Z |
| Discovery magnitude (MPC) | 20.62 G |
| Discovery observatory (MPC) | G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-09-03.0000000 |
| e | 0.94400369 |
| q (au) | 2.063574 |
| a (au) | 36.851962 |
| i (deg) | 98.906187 |
| Ω (om, deg) | 332.870315 |
| ω (w, deg) | 168.949317 |
| M (ma, deg) | 359.735984 |
等級
散乱 + 全体線形
$$ M_a = (16.023 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 16.023 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.667 |
| 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 |
|---|---|---|---|
| 2022-07-20 | 2023-04-09 | +3.8316 | -2.017 |
| 2023-04-09 | 2023-10-27 | -2.7235 | +0.975 |
| 2023-11-10 | 2024-04-16 | +0.1898 | +0.000 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 03:01:34.33 | -56:47:10.4 | HIP 14339 | 35.59 |
| 2026-07-29 12:00 | 03:01:32.71 | -56:50:08.5 | HIP 14339 | 33.93 |
| 2026-07-30 00:00 | 03:01:30.89 | -56:53:06.9 | HIP 14339 | 32.48 |
| 2026-07-30 12:00 | 03:01:28.87 | -56:56:05.8 | HIP 14339 | 31.27 |
| 2026-07-31 00:00 | 03:01:26.65 | -56:59:05.2 | HIP 14339 | 30.33 |
| 2026-07-31 12:00 | 03:01:24.23 | -57:02:04.9 | HIP 14339 | 29.68 |
| 2026-08-01 00:00 | 03:01:21.61 | -57:05:05.0 | HIP 14339 | 29.36 |
| 2026-08-01 12:00 | 03:01:18.78 | -57:08:05.4 | HIP 14227 | 29.20 |
| 2026-08-02 00:00 | 03:01:15.76 | -57:11:06.3 | HIP 14227 | 27.11 |
| 2026-08-02 12:00 | 03:01:12.52 | -57:14:07.5 | HIP 14227 | 25.22 |
| 2026-08-03 00:00 | 03:01:09.09 | -57:17:09.0 | HIP 14227 | 23.59 |
| 2026-08-03 12:00 | 03:01:05.44 | -57:20:10.8 | HIP 14227 | 22.29 |
| 2026-08-04 00:00 | 03:01:01.59 | -57:23:12.9 | HIP 14227 | 21.37 |
| 2026-08-04 12:00 | 03:00:57.52 | -57:26:15.3 | HIP 14227 | 20.90 |
| 2026-08-05 00:00 | 03:00:53.25 | -57:29:18.0 | HIP 14227 | 20.91 |
| 2026-08-05 12:00 | 03:00:48.76 | -57:32:20.9 | HIP 13898 | 20.37 |
| 2026-08-06 00:00 | 03:00:44.06 | -57:35:24.1 | HIP 13898 | 17.92 |
| 2026-08-06 12:00 | 03:00:39.15 | -57:38:27.5 | HIP 13898 | 15.68 |
| 2026-08-07 00:00 | 03:00:34.02 | -57:41:31.1 | HIP 13898 | 13.76 |
| 2026-08-07 12:00 | 03:00:28.68 | -57:44:34.8 | HIP 13898 | 12.33 |
| 2026-08-08 00:00 | 03:00:23.12 | -57:47:38.8 | HIP 13898 | 11.56 |
| 2026-08-08 12:00 | 03:00:17.34 | -57:50:42.9 | HIP 13898 | 11.61 |
| 2026-08-09 00:00 | 03:00:11.34 | -57:53:47.2 | HIP 13898 | 12.46 |
| 2026-08-09 12:00 | 03:00:05.11 | -57:56:51.5 | HIP 13898 | 13.98 |
| 2026-08-10 00:00 | 02:59:58.67 | -57:59:56.0 | HIP 13975 | 14.46 |
| 2026-08-10 12:00 | 02:59:52.01 | -58:03:00.6 | HIP 13975 | 11.44 |
| 2026-08-11 00:00 | 02:59:45.12 | -58:06:05.2 | HIP 13975 | 8.56 |
| 2026-08-11 12:00 | 02:59:38.00 | -58:09:09.9 | HIP 13975 | 6.03 |
| 2026-08-12 00:00 | 02:59:30.66 | -58:12:14.6 | HIP 13975 | 4.51 |
| 2026-08-12 12:00 | 02:59:23.09 | -58:15:19.3 | HIP 13975 | 5.05 |
| 2026-08-13 00:00 | 02:59:15.30 | -58:18:24.0 | HIP 13975 | 7.20 |
| 2026-08-13 12:00 | 02:59:07.27 | -58:21:28.6 | HIP 13975 | 9.98 |
| 2026-08-14 00:00 | 02:58:59.02 | -58:24:33.3 | HIP 13975 | 13.00 |
| 2026-08-14 12:00 | 02:58:50.54 | -58:27:37.8 | HIP 13975 | 16.13 |
| 2026-08-15 00:00 | 02:58:41.82 | -58:30:42.3 | HIP 13975 | 19.32 |
| 2026-08-15 12:00 | 02:58:32.88 | -58:33:46.7 | HIP 13792 | 21.77 |
| 2026-08-16 00:00 | 02:58:23.70 | -58:36:50.9 | HIP 13792 | 18.48 |
| 2026-08-16 12:00 | 02:58:14.29 | -58:39:55.0 | HIP 13792 | 15.18 |
| 2026-08-17 00:00 | 02:58:04.65 | -58:42:58.9 | HIP 13792 | 11.88 |
| 2026-08-17 12:00 | 02:57:54.78 | -58:46:02.7 | HIP 13792 | 8.57 |
| 2026-08-18 00:00 | 02:57:44.67 | -58:49:06.3 | HIP 13792 | 5.28 |
| 2026-08-18 12:00 | 02:57:34.32 | -58:52:09.6 | HIP 13792 | 2.13 |
| 2026-08-19 00:00 | 02:57:23.74 | -58:55:12.7 | HIP 13792 | 1.87 |