C/2026 A1 (MAPS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2026 A1 (MAPS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-04-04T13:39:43.744320Z |
| Orbit solution date (soln_date, UTC) | 2026-01-21T08:43:07Z |
| Obs used | 146 |
| NEO | - |
| M1 | 14.600 |
| K1 | 12.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2026-01-13T03:38:48.480000Z |
| Discovery magnitude (MPC) | 17.80 G |
| Discovery observatory (MPC) | W94 · MAPS, San Pedro de Atacama |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2026-01-16.0000000 |
| e | 0.99995039 |
| q (au) | 0.005471 |
| a (au) | 110.286881 |
| i (deg) | 144.509788 |
| Ω (om, deg) | 7.869393 |
| ω (w, deg) | 86.463128 |
| M (ma, deg) | 359.933139 |
等級
散乱 + 全体線形
$$ M_a = (12.292 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.292 |
| n | 6.000 |
| gf | 1.000 |
| gb | -1.000 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2026-01-13 | 2026-02-09 | +17.6701 | -4.748 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 03:59:01.65 | -28:52:06.2 | HIP 18644 | 7.94 |
| 2026-02-03 12:00 | 03:57:24.02 | -28:41:12.8 | HIP 18418 | 22.81 |
| 2026-02-04 00:00 | 03:55:47.19 | -28:30:10.2 | HIP 18418 | 8.85 |
| 2026-02-04 12:00 | 03:54:11.17 | -28:18:58.7 | HIP 18418 | 27.91 |
| 2026-02-05 00:00 | 03:52:35.95 | -28:07:38.4 | HIP 18254 | 35.47 |
| 2026-02-05 12:00 | 03:51:01.54 | -27:56:09.6 | HIP 17816 | 43.83 |
| 2026-02-06 00:00 | 03:49:27.96 | -27:44:32.6 | HIP 17712 | 41.43 |
| 2026-02-06 12:00 | 03:47:55.19 | -27:32:47.4 | HIP 17712 | 22.05 |
| 2026-02-07 00:00 | 03:46:23.26 | -27:20:54.3 | HIP 17712 | 19.27 |
| 2026-02-07 12:00 | 03:44:52.14 | -27:08:53.5 | HIP 17522 | 27.68 |
| 2026-02-08 00:00 | 03:43:21.86 | -26:56:45.2 | HIP 17522 | 45.75 |
| 2026-02-08 12:00 | 03:41:52.41 | -26:44:29.6 | HIP 17115 | 40.51 |
| 2026-02-09 00:00 | 03:40:23.79 | -26:32:06.9 | HIP 17115 | 19.73 |
| 2026-02-09 12:00 | 03:38:56.01 | -26:19:37.3 | HIP 17115 | 14.97 |
| 2026-02-10 00:00 | 03:37:29.05 | -26:07:00.9 | HIP 16752 | 32.47 |
| 2026-02-10 12:00 | 03:36:02.91 | -25:54:18.1 | HIP 16697 | 25.02 |
| 2026-02-11 00:00 | 03:34:37.61 | -25:41:28.9 | HIP 16697 | 7.31 |
| 2026-02-11 12:00 | 03:33:13.12 | -25:28:33.6 | HIP 16503 | 15.15 |
| 2026-02-12 00:00 | 03:31:49.46 | -25:15:32.4 | HIP 16449 | 21.33 |
| 2026-02-12 12:00 | 03:30:26.60 | -25:02:25.3 | HIP 16225 | 21.19 |
| 2026-02-13 00:00 | 03:29:04.56 | -24:49:12.7 | HIP 16225 | 4.58 |
| 2026-02-13 12:00 | 03:27:43.32 | -24:35:54.6 | HIP 16225 | 25.12 |
| 2026-02-14 00:00 | 03:26:22.88 | -24:22:31.3 | HIP 15952 | 18.15 |
| 2026-02-14 12:00 | 03:25:03.22 | -24:09:02.8 | HIP 15859 | 14.00 |
| 2026-02-15 00:00 | 03:23:44.35 | -23:55:29.4 | HIP 15859 | 23.69 |
| 2026-02-15 12:00 | 03:22:26.26 | -23:41:51.3 | HIP 15643 | 14.73 |
| 2026-02-16 00:00 | 03:21:08.93 | -23:28:08.5 | HIP 15643 | 10.55 |
| 2026-02-16 12:00 | 03:19:52.35 | -23:14:21.3 | HIP 15579 | 12.27 |
| 2026-02-17 00:00 | 03:18:36.53 | -23:00:29.7 | HIP 15280 | 19.91 |
| 2026-02-17 12:00 | 03:17:21.44 | -22:46:34.0 | HIP 15280 | 15.25 |
| 2026-02-18 00:00 | 03:16:07.08 | -22:32:34.2 | HIP 15352 | 25.81 |
| 2026-02-18 12:00 | 03:14:53.43 | -22:18:30.5 | HIP 15012 | 28.12 |
| 2026-02-19 00:00 | 03:13:40.49 | -22:04:23.0 | HIP 15012 | 6.88 |
| 2026-02-19 12:00 | 03:12:28.24 | -21:50:11.8 | HIP 15012 | 16.46 |
| 2026-02-20 00:00 | 03:11:16.67 | -21:35:57.1 | HIP 14737 | 14.74 |
| 2026-02-20 12:00 | 03:10:05.76 | -21:21:38.9 | HIP 14737 | 20.21 |
| 2026-02-21 00:00 | 03:08:55.50 | -21:07:17.4 | HIP 14498 | 36.55 |
| 2026-02-21 12:00 | 03:07:45.88 | -20:52:52.7 | HIP 14498 | 15.52 |
| 2026-02-22 00:00 | 03:06:36.88 | -20:38:24.8 | HIP 14498 | 9.37 |
| 2026-02-22 12:00 | 03:05:28.49 | -20:23:53.9 | HIP 14279 | 27.54 |
| 2026-02-23 00:00 | 03:04:20.69 | -20:09:20.0 | HIP 14138 | 32.36 |
| 2026-02-23 12:00 | 03:03:13.47 | -19:54:43.2 | HIP 14138 | 12.98 |
| 2026-02-24 00:00 | 03:02:06.80 | -19:40:03.6 | HIP 14138 | 14.69 |