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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 07:27:14.11 | -03:56:52.1 | HIP 36137 | 23.89 |
| 2026-07-29 12:00 | 07:27:41.73 | -04:00:04.5 | HIP 36137 | 24.62 |
| 2026-07-30 00:00 | 07:28:09.19 | -04:03:17.7 | HIP 36394 | 22.45 |
| 2026-07-30 12:00 | 07:28:36.49 | -04:06:31.8 | HIP 36394 | 15.13 |
| 2026-07-31 00:00 | 07:29:03.63 | -04:09:46.7 | HIP 36394 | 8.23 |
| 2026-07-31 12:00 | 07:29:30.61 | -04:13:02.4 | HIP 36394 | 4.35 |
| 2026-08-01 00:00 | 07:29:57.43 | -04:16:19.0 | HIP 36394 | 9.01 |
| 2026-08-01 12:00 | 07:30:24.09 | -04:19:36.4 | HIP 36394 | 15.91 |
| 2026-08-02 00:00 | 07:30:50.59 | -04:22:54.7 | HIP 36613 | 14.01 |
| 2026-08-02 12:00 | 07:31:16.94 | -04:26:13.7 | HIP 36613 | 8.72 |
| 2026-08-03 00:00 | 07:31:43.12 | -04:29:33.7 | HIP 36613 | 8.02 |
| 2026-08-03 12:00 | 07:32:09.15 | -04:32:54.4 | HIP 36613 | 12.64 |
| 2026-08-04 00:00 | 07:32:35.02 | -04:36:16.0 | HIP 36743 | 16.98 |
| 2026-08-04 12:00 | 07:33:00.73 | -04:39:38.4 | HIP 36743 | 15.93 |
| 2026-08-05 00:00 | 07:33:26.28 | -04:43:01.6 | HIP 36743 | 18.01 |
| 2026-08-05 12:00 | 07:33:51.67 | -04:46:25.7 | HIP 36743 | 22.34 |
| 2026-08-06 00:00 | 07:34:16.90 | -04:49:50.6 | HIP 36743 | 27.87 |
| 2026-08-06 12:00 | 07:34:41.97 | -04:53:16.3 | HIP 36880 | 32.35 |
| 2026-08-07 00:00 | 07:35:06.88 | -04:56:42.9 | HIP 36880 | 28.96 |
| 2026-08-07 12:00 | 07:35:31.63 | -05:00:10.2 | HIP 36880 | 27.02 |
| 2026-08-08 00:00 | 07:35:56.22 | -05:03:38.4 | HIP 36880 | 26.83 |
| 2026-08-08 12:00 | 07:36:20.65 | -05:07:07.5 | HIP 36880 | 28.39 |
| 2026-08-09 00:00 | 07:36:44.92 | -05:10:37.3 | HIP 36880 | 31.43 |
| 2026-08-09 12:00 | 07:37:09.03 | -05:14:08.0 | HIP 37220 | 27.66 |
| 2026-08-10 00:00 | 07:37:32.98 | -05:17:39.5 | HIP 37233 | 22.01 |
| 2026-08-10 12:00 | 07:37:56.76 | -05:21:11.7 | HIP 37233 | 15.12 |
| 2026-08-11 00:00 | 07:38:20.38 | -05:24:44.9 | HIP 37233 | 8.30 |
| 2026-08-11 12:00 | 07:38:43.84 | -05:28:18.8 | HIP 37233 | 1.87 |
| 2026-08-12 00:00 | 07:39:07.13 | -05:31:53.5 | HIP 37233 | 5.61 |
| 2026-08-12 12:00 | 07:39:30.26 | -05:35:29.0 | HIP 37260 | 7.53 |
| 2026-08-13 00:00 | 07:39:53.23 | -05:39:05.3 | HIP 37260 | 11.64 |
| 2026-08-13 12:00 | 07:40:16.03 | -05:42:42.5 | HIP 37260 | 17.44 |
| 2026-08-14 00:00 | 07:40:38.66 | -05:46:20.4 | HIP 37260 | 23.69 |
| 2026-08-14 12:00 | 07:41:01.12 | -05:49:59.1 | HIP 37260 | 30.11 |
| 2026-08-15 00:00 | 07:41:23.42 | -05:53:38.5 | HIP 37332 | 31.53 |
| 2026-08-15 12:00 | 07:41:45.56 | -05:57:18.8 | HIP 37332 | 33.80 |
| 2026-08-16 00:00 | 07:42:07.52 | -06:00:59.8 | HIP 37661 | 28.81 |
| 2026-08-16 12:00 | 07:42:29.32 | -06:04:41.6 | HIP 37661 | 22.27 |
| 2026-08-17 00:00 | 07:42:50.94 | -06:08:24.1 | HIP 37661 | 15.76 |
| 2026-08-17 12:00 | 07:43:12.40 | -06:12:07.4 | HIP 37661 | 9.30 |
| 2026-08-18 00:00 | 07:43:33.69 | -06:15:51.5 | HIP 37661 | 3.07 |
| 2026-08-18 12:00 | 07:43:54.81 | -06:19:36.3 | HIP 37661 | 3.98 |
| 2026-08-19 00:00 | 07:44:15.75 | -06:23:21.9 | HIP 37661 | 10.23 |