C/2026 B2 (Sun-Gao)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2026 B2 (Sun-Gao) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-01-10T02:50:21.344640Z |
| Orbit solution date (soln_date, UTC) | 2026-07-06T12:12:32Z |
| Obs used | 192 |
| NEO | - |
| M1 | 13.100 |
| K1 | 11.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2026-01-19T00:03:36.864000Z |
| Discovery magnitude (MPC) | 15.50 G |
| Discovery observatory (MPC) | N86 · Xingming Observatory-KATS, Nanshan |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2026-02-11.0000000 |
| e | 0.99755632 |
| q (au) | 1.284249 |
| a (au) | 525.538377 |
| i (deg) | 59.578831 |
| Ω (om, deg) | 234.638443 |
| ω (w, deg) | 47.299031 |
| M (ma, deg) | 0.002608 |
等級
散乱 + 全体線形
$$ M_a = (12.107 + 4.695\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.107 |
| n | 4.695 |
| gf | 1.000 |
| gb | -0.998 |
| 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 |
|---|---|---|---|
| 2026-01-19 | 2026-02-25 | -53.5433 | +6.330 |
| 2026-02-25 | 2026-04-09 | +21.4734 | -5.370 |
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 | 03:02:14.75 | +45:56:10.9 | HIP 14085 | 8.70 |
| 2026-07-29 12:00 | 03:02:33.61 | +45:57:04.1 | HIP 14085 | 11.85 |
| 2026-07-30 00:00 | 03:02:52.09 | +45:57:56.6 | HIP 14085 | 15.04 |
| 2026-07-30 12:00 | 03:03:10.20 | +45:58:48.3 | HIP 14085 | 18.22 |
| 2026-07-31 00:00 | 03:03:27.92 | +45:59:39.2 | HIP 14085 | 21.36 |
| 2026-07-31 12:00 | 03:03:45.25 | +46:00:29.3 | HIP 14336 | 22.78 |
| 2026-08-01 00:00 | 03:04:02.20 | +46:01:18.6 | HIP 14336 | 20.72 |
| 2026-08-01 12:00 | 03:04:18.77 | +46:02:07.2 | HIP 14336 | 18.95 |
| 2026-08-02 00:00 | 03:04:34.95 | +46:02:54.9 | HIP 14336 | 17.54 |
| 2026-08-02 12:00 | 03:04:50.74 | +46:03:41.8 | HIP 14336 | 16.55 |
| 2026-08-03 00:00 | 03:05:06.14 | +46:04:27.8 | HIP 14336 | 16.00 |
| 2026-08-03 12:00 | 03:05:21.14 | +46:05:13.1 | HIP 14336 | 15.92 |
| 2026-08-04 00:00 | 03:05:35.76 | +46:05:57.4 | HIP 14336 | 16.27 |
| 2026-08-04 12:00 | 03:05:49.98 | +46:06:41.0 | HIP 14336 | 17.00 |
| 2026-08-05 00:00 | 03:06:03.80 | +46:07:23.6 | HIP 14336 | 18.02 |
| 2026-08-05 12:00 | 03:06:17.23 | +46:08:05.4 | HIP 14336 | 19.27 |
| 2026-08-06 00:00 | 03:06:30.26 | +46:08:46.3 | HIP 14336 | 20.68 |
| 2026-08-06 12:00 | 03:06:42.88 | +46:09:26.3 | HIP 14336 | 22.20 |
| 2026-08-07 00:00 | 03:06:55.11 | +46:10:05.4 | HIP 14336 | 23.78 |
| 2026-08-07 12:00 | 03:07:06.93 | +46:10:43.6 | HIP 14336 | 25.39 |
| 2026-08-08 00:00 | 03:07:18.34 | +46:11:20.8 | HIP 14472 | 26.83 |
| 2026-08-08 12:00 | 03:07:29.35 | +46:11:57.1 | HIP 14472 | 27.85 |
| 2026-08-09 00:00 | 03:07:39.95 | +46:12:32.4 | HIP 14472 | 28.95 |
| 2026-08-09 12:00 | 03:07:50.14 | +46:13:06.7 | HIP 14472 | 30.08 |
| 2026-08-10 00:00 | 03:07:59.91 | +46:13:40.1 | HIP 14742 | 29.87 |
| 2026-08-10 12:00 | 03:08:09.28 | +46:14:12.4 | HIP 14742 | 28.89 |
| 2026-08-11 00:00 | 03:08:18.23 | +46:14:43.7 | HIP 14742 | 28.02 |
| 2026-08-11 12:00 | 03:08:26.76 | +46:15:14.0 | HIP 14742 | 27.26 |
| 2026-08-12 00:00 | 03:08:34.88 | +46:15:43.2 | HIP 14742 | 26.61 |
| 2026-08-12 12:00 | 03:08:42.57 | +46:16:11.3 | HIP 14742 | 26.06 |
| 2026-08-13 00:00 | 03:08:49.85 | +46:16:38.3 | HIP 14742 | 25.61 |
| 2026-08-13 12:00 | 03:08:56.71 | +46:17:04.3 | HIP 14742 | 25.25 |
| 2026-08-14 00:00 | 03:09:03.15 | +46:17:29.1 | HIP 14742 | 24.97 |
| 2026-08-14 12:00 | 03:09:09.16 | +46:17:52.8 | HIP 14742 | 24.77 |
| 2026-08-15 00:00 | 03:09:14.75 | +46:18:15.3 | HIP 14742 | 24.63 |
| 2026-08-15 12:00 | 03:09:19.92 | +46:18:36.6 | HIP 14742 | 24.55 |
| 2026-08-16 00:00 | 03:09:24.66 | +46:18:56.7 | HIP 14742 | 24.52 |
| 2026-08-16 12:00 | 03:09:28.98 | +46:19:15.7 | HIP 14742 | 24.52 |
| 2026-08-17 00:00 | 03:09:32.87 | +46:19:33.4 | HIP 14742 | 24.56 |
| 2026-08-17 12:00 | 03:09:36.33 | +46:19:49.8 | HIP 14742 | 24.63 |
| 2026-08-18 00:00 | 03:09:39.37 | +46:20:05.0 | HIP 14742 | 24.71 |
| 2026-08-18 12:00 | 03:09:41.98 | +46:20:18.9 | HIP 14742 | 24.81 |
| 2026-08-19 00:00 | 03:09:44.16 | +46:20:31.5 | HIP 14742 | 24.91 |