C/2026 A1 (MAPS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2026 A1 (MAPS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-04-04T14:23:37.898880Z |
| Orbit solution date (soln_date, UTC) | 2026-06-05T03:03:24Z |
| Obs used | 472 |
| NEO | - |
| M1 | 14.800 |
| K1 | 14.500 |
| 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) | 2026-02-12.0000000 |
| e | 0.99996265 |
| q (au) | 0.005729 |
| a (au) | 153.392016 |
| i (deg) | 144.493658 |
| Ω (om, deg) | 7.865158 |
| ω (w, deg) | 86.324709 |
| M (ma, deg) | 359.973230 |
等級
散乱 + 全体線形
$$ M_a = (13.441 + 4.858\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 13.441 |
| n | 4.858 |
| gf | 1.000 |
| gb | -0.500 |
| 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 | 2026-03-11 | +7.1892 | -2.117 |
| 2026-03-11 | 2026-04-03 | -2.1269 | -2.314 |
| 2026-04-03 | 2026-04-04 | -6.6927 | -6.419 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 08:00:15.67 | -10:46:57.8 | HIP 39056 | 22.05 |
| 2026-09-20 12:00 | 08:00:24.13 | -10:51:22.8 | HIP 39056 | 26.87 |
| 2026-09-21 00:00 | 08:00:32.38 | -10:55:48.1 | HIP 39056 | 31.68 |
| 2026-09-21 12:00 | 08:00:40.41 | -11:00:13.9 | HIP 39056 | 36.49 |
| 2026-09-22 00:00 | 08:00:48.21 | -11:04:40.0 | HIP 39008 | 37.53 |
| 2026-09-22 12:00 | 08:00:55.79 | -11:09:06.4 | HIP 39008 | 36.03 |
| 2026-09-23 00:00 | 08:01:03.14 | -11:13:33.2 | HIP 39008 | 35.08 |
| 2026-09-23 12:00 | 08:01:10.27 | -11:18:00.4 | HIP 39008 | 34.72 |
| 2026-09-24 00:00 | 08:01:17.17 | -11:22:27.9 | HIP 39008 | 34.96 |
| 2026-09-24 12:00 | 08:01:23.85 | -11:26:55.7 | HIP 39008 | 35.77 |
| 2026-09-25 00:00 | 08:01:30.29 | -11:31:23.8 | HIP 39008 | 37.13 |
| 2026-09-25 12:00 | 08:01:36.51 | -11:35:52.3 | HIP 39218 | 38.22 |
| 2026-09-26 00:00 | 08:01:42.49 | -11:40:21.0 | HIP 39218 | 33.99 |
| 2026-09-26 12:00 | 08:01:48.25 | -11:44:50.0 | HIP 39218 | 29.88 |
| 2026-09-27 00:00 | 08:01:53.77 | -11:49:19.3 | HIP 39218 | 25.96 |
| 2026-09-27 12:00 | 08:01:59.05 | -11:53:48.9 | HIP 39218 | 22.30 |
| 2026-09-28 00:00 | 08:02:04.11 | -11:58:18.8 | HIP 39218 | 19.06 |
| 2026-09-28 12:00 | 08:02:08.92 | -12:02:48.8 | HIP 39218 | 16.46 |
| 2026-09-29 00:00 | 08:02:13.51 | -12:07:19.2 | HIP 39218 | 14.85 |
| 2026-09-29 12:00 | 08:02:17.85 | -12:11:49.7 | HIP 39218 | 14.54 |
| 2026-09-30 00:00 | 08:02:21.95 | -12:16:20.5 | HIP 39218 | 15.60 |
| 2026-09-30 12:00 | 08:02:25.82 | -12:20:51.5 | HIP 39218 | 17.78 |
| 2026-10-01 00:00 | 08:02:29.44 | -12:25:22.7 | HIP 39218 | 20.73 |
| 2026-10-01 12:00 | 08:02:32.83 | -12:29:54.1 | HIP 39298 | 19.52 |
| 2026-10-02 00:00 | 08:02:35.96 | -12:34:25.7 | HIP 39298 | 15.69 |
| 2026-10-02 12:00 | 08:02:38.86 | -12:38:57.5 | HIP 39298 | 12.36 |
| 2026-10-03 00:00 | 08:02:41.50 | -12:43:29.4 | HIP 39298 | 10.00 |
| 2026-10-03 12:00 | 08:02:43.91 | -12:48:01.4 | HIP 39298 | 9.38 |
| 2026-10-04 00:00 | 08:02:46.06 | -12:52:33.6 | HIP 39298 | 10.80 |
| 2026-10-04 12:00 | 08:02:47.96 | -12:57:05.9 | HIP 39298 | 13.63 |
| 2026-10-05 00:00 | 08:02:49.61 | -13:01:38.3 | HIP 39409 | 13.48 |
| 2026-10-05 12:00 | 08:02:51.01 | -13:06:10.8 | HIP 39409 | 10.03 |
| 2026-10-06 00:00 | 08:02:52.16 | -13:10:43.3 | HIP 39409 | 7.87 |
| 2026-10-06 12:00 | 08:02:53.05 | -13:15:15.9 | HIP 39409 | 8.10 |
| 2026-10-07 00:00 | 08:02:53.68 | -13:19:48.6 | HIP 39409 | 10.57 |
| 2026-10-07 12:00 | 08:02:54.06 | -13:24:21.3 | HIP 39409 | 14.14 |
| 2026-10-08 00:00 | 08:02:54.18 | -13:28:54.0 | HIP 39409 | 18.18 |
| 2026-10-08 12:00 | 08:02:54.04 | -13:33:26.7 | HIP 39409 | 22.43 |
| 2026-10-09 00:00 | 08:02:53.64 | -13:37:59.3 | HIP 39409 | 26.80 |
| 2026-10-09 12:00 | 08:02:52.98 | -13:42:32.0 | HIP 39409 | 31.23 |
| 2026-10-10 00:00 | 08:02:52.05 | -13:47:04.5 | HIP 39197 | 34.06 |
| 2026-10-10 12:00 | 08:02:50.86 | -13:51:37.0 | HIP 39197 | 31.19 |
| 2026-10-11 00:00 | 08:02:49.41 | -13:56:09.4 | HIP 39197 | 28.69 |