C/2026 A1 (MAPS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2026 A1 (MAPS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-04-04T14:23:37.916160Z |
| Orbit solution date (soln_date, UTC) | 2026-04-08T14:12:15Z |
| Obs used | 471 |
| 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) | 153.392405 |
| i (deg) | 144.493659 |
| Ω (om, deg) | 7.865127 |
| ω (w, deg) | 86.324682 |
| M (ma, deg) | 359.973230 |
等級
散乱 + 全体線形
$$ M_a = (12.889 + 4.640\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.889 |
| n | 4.640 |
| 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 | 2026-03-16 | +6.1484 | -1.268 |
| 2026-03-16 | 2026-04-03 | -1.4270 | -1.640 |
| 2026-04-03 | 2026-04-04 | -6.1081 | -5.816 |
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 | 05:27:50.66 | +01:21:24.4 | HIP 25582 | 4.43 |
| 2026-05-12 12:00 | 05:29:12.71 | +01:20:24.2 | HIP 25645 | 10.23 |
| 2026-05-13 00:00 | 05:30:33.69 | +01:19:23.7 | HIP 25828 | 17.92 |
| 2026-05-13 12:00 | 05:31:53.62 | +01:18:22.8 | HIP 25881 | 23.77 |
| 2026-05-14 00:00 | 05:33:12.53 | +01:17:21.5 | HIP 26098 | 13.31 |
| 2026-05-14 12:00 | 05:34:30.45 | +01:16:19.8 | HIP 26143 | 5.41 |
| 2026-05-15 00:00 | 05:35:47.41 | +01:15:17.7 | HIP 26280 | 4.12 |
| 2026-05-15 12:00 | 05:37:03.43 | +01:14:15.0 | HIP 26481 | 19.99 |
| 2026-05-16 00:00 | 05:38:18.54 | +01:13:11.9 | HIP 26481 | 15.02 |
| 2026-05-16 12:00 | 05:39:32.75 | +01:12:08.3 | HIP 26687 | 17.70 |
| 2026-05-17 00:00 | 05:40:46.10 | +01:11:04.1 | HIP 26687 | 14.64 |
| 2026-05-17 12:00 | 05:41:58.60 | +01:09:59.3 | HIP 26885 | 19.96 |
| 2026-05-18 00:00 | 05:43:10.28 | +01:08:54.0 | HIP 27013 | 11.02 |
| 2026-05-18 12:00 | 05:44:21.15 | +01:07:48.0 | HIP 27013 | 9.45 |
| 2026-05-19 00:00 | 05:45:31.23 | +01:06:41.4 | HIP 27253 | 16.29 |
| 2026-05-19 12:00 | 05:46:40.55 | +01:05:34.2 | HIP 27253 | 4.75 |
| 2026-05-20 00:00 | 05:47:49.12 | +01:04:26.3 | HIP 27412 | 12.78 |
| 2026-05-20 12:00 | 05:48:56.95 | +01:03:17.8 | HIP 27412 | 15.00 |
| 2026-05-21 00:00 | 05:50:04.08 | +01:02:08.5 | HIP 27452 | 26.97 |
| 2026-05-21 12:00 | 05:51:10.50 | +01:00:58.6 | HIP 27842 | 37.00 |
| 2026-05-22 00:00 | 05:52:16.24 | +00:59:47.9 | HIP 27842 | 22.01 |
| 2026-05-22 12:00 | 05:53:21.32 | +00:58:36.6 | HIP 27842 | 11.95 |
| 2026-05-23 00:00 | 05:54:25.74 | +00:57:24.5 | HIP 27939 | 4.63 |
| 2026-05-23 12:00 | 05:55:29.53 | +00:56:11.7 | HIP 28056 | 9.20 |
| 2026-05-24 00:00 | 05:56:32.70 | +00:54:58.1 | HIP 28056 | 10.06 |
| 2026-05-24 12:00 | 05:57:35.25 | +00:53:43.7 | HIP 28232 | 20.31 |
| 2026-05-25 00:00 | 05:58:37.22 | +00:52:28.6 | HIP 28296 | 19.54 |
| 2026-05-25 12:00 | 05:59:38.59 | +00:51:12.8 | HIP 28296 | 21.80 |
| 2026-05-26 00:00 | 06:00:39.40 | +00:49:56.1 | HIP 28613 | 30.04 |
| 2026-05-26 12:00 | 06:01:39.65 | +00:48:38.7 | HIP 28613 | 19.85 |
| 2026-05-27 00:00 | 06:02:39.35 | +00:47:20.5 | HIP 28613 | 18.50 |
| 2026-05-27 12:00 | 06:03:38.52 | +00:46:01.4 | HIP 28746 | 12.91 |
| 2026-05-28 00:00 | 06:04:37.16 | +00:44:41.6 | HIP 28746 | 9.68 |
| 2026-05-28 12:00 | 06:05:35.29 | +00:43:21.0 | HIP 28847 | 7.29 |
| 2026-05-29 00:00 | 06:06:32.92 | +00:41:59.5 | HIP 28990 | 10.32 |
| 2026-05-29 12:00 | 06:07:30.06 | +00:40:37.3 | HIP 28990 | 10.81 |
| 2026-05-30 00:00 | 06:08:26.71 | +00:39:14.2 | HIP 28990 | 23.11 |
| 2026-05-30 12:00 | 06:09:22.89 | +00:37:50.2 | HIP 29258 | 12.42 |
| 2026-05-31 00:00 | 06:10:18.60 | +00:36:25.5 | HIP 29258 | 6.65 |
| 2026-05-31 12:00 | 06:11:13.87 | +00:34:59.9 | HIP 29420 | 13.95 |
| 2026-06-01 00:00 | 06:12:08.68 | +00:33:33.4 | HIP 29420 | 12.17 |
| 2026-06-01 12:00 | 06:13:03.06 | +00:32:06.1 | HIP 29506 | 13.34 |
| 2026-06-02 00:00 | 06:13:57.01 | +00:30:37.9 | HIP 29506 | 20.70 |