C/2014 UN271 (Bernardinelli-Bernstein)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2014 UN271 (Bernardinelli-Bernstein) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2031-01-25T23:22:28.390080Z |
| Orbit solution date (soln_date, UTC) | 2026-05-28T12:12:14Z |
| Obs used | 2218 |
| NEO | - |
| M1 | 5.600 |
| K1 | 4.250 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2021-11-22.0000000 |
| e | 0.99908485 |
| q (au) | 10.936504 |
| a (au) | 11950.552043 |
| i (deg) | 95.437722 |
| Ω (om, deg) | 189.913880 |
| ω (w, deg) | 326.347707 |
| M (ma, deg) | 359.997471 |
等級
散乱 + 全体線形
$$ M_a = (-5.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | -5.000 |
| n | 6.000 |
| gf | 0.800 |
| gb | -0.745 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2021-07-07 | 2024-05-22 | -4.1422 | +5.262 |
| 2024-05-22 | 2026-05-24 | +9.3459 | -10.862 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 05:46:27.21 | -68:09:37.3 | HIP 26995 | 16.51 |
| 2026-06-01 12:00 | 05:46:56.21 | -68:09:08.5 | HIP 27186 | 18.58 |
| 2026-06-02 00:00 | 05:47:25.26 | -68:08:40.4 | HIP 27186 | 19.34 |
| 2026-06-02 12:00 | 05:47:54.34 | -68:08:13.0 | HIP 27186 | 20.45 |
| 2026-06-03 00:00 | 05:48:23.47 | -68:07:46.3 | HIP 27186 | 21.87 |
| 2026-06-03 12:00 | 05:48:52.64 | -68:07:20.4 | HIP 27186 | 23.55 |
| 2026-06-04 00:00 | 05:49:21.84 | -68:06:55.1 | HIP 27819 | 21.26 |
| 2026-06-04 12:00 | 05:49:51.08 | -68:06:30.5 | HIP 27819 | 18.55 |
| 2026-06-05 00:00 | 05:50:20.36 | -68:06:06.6 | HIP 27819 | 15.85 |
| 2026-06-05 12:00 | 05:50:49.68 | -68:05:43.4 | HIP 27819 | 13.16 |
| 2026-06-06 00:00 | 05:51:19.04 | -68:05:21.0 | HIP 27819 | 10.50 |
| 2026-06-06 12:00 | 05:51:48.43 | -68:04:59.2 | HIP 27819 | 7.90 |
| 2026-06-07 00:00 | 05:52:17.85 | -68:04:38.1 | HIP 27819 | 5.46 |
| 2026-06-07 12:00 | 05:52:47.31 | -68:04:17.8 | HIP 27819 | 3.53 |
| 2026-06-08 00:00 | 05:53:16.80 | -68:03:58.2 | HIP 27819 | 3.21 |
| 2026-06-08 12:00 | 05:53:46.33 | -68:03:39.2 | HIP 27819 | 4.84 |
| 2026-06-09 00:00 | 05:54:15.89 | -68:03:21.0 | HIP 27819 | 7.21 |
| 2026-06-09 12:00 | 05:54:45.48 | -68:03:03.5 | HIP 28026 | 4.94 |
| 2026-06-10 00:00 | 05:55:15.10 | -68:02:46.7 | HIP 28026 | 2.16 |
| 2026-06-10 12:00 | 05:55:44.75 | -68:02:30.7 | HIP 28026 | 0.68 |
| 2026-06-11 00:00 | 05:56:14.43 | -68:02:15.3 | HIP 28026 | 3.43 |
| 2026-06-11 12:00 | 05:56:44.14 | -68:02:00.7 | HIP 28026 | 6.21 |
| 2026-06-12 00:00 | 05:57:13.88 | -68:01:46.8 | HIP 28026 | 9.00 |
| 2026-06-12 12:00 | 05:57:43.64 | -68:01:33.6 | HIP 28026 | 11.79 |
| 2026-06-13 00:00 | 05:58:13.43 | -68:01:21.1 | HIP 28026 | 14.58 |
| 2026-06-13 12:00 | 05:58:43.25 | -68:01:09.4 | HIP 28026 | 17.38 |
| 2026-06-14 00:00 | 05:59:13.09 | -68:00:58.4 | HIP 28563 | 16.80 |
| 2026-06-14 12:00 | 05:59:42.95 | -68:00:48.1 | HIP 28563 | 14.42 |
| 2026-06-15 00:00 | 06:00:12.84 | -68:00:38.5 | HIP 28563 | 12.23 |
| 2026-06-15 12:00 | 06:00:42.74 | -68:00:29.7 | HIP 28563 | 10.35 |
| 2026-06-16 00:00 | 06:01:12.67 | -68:00:21.6 | HIP 28563 | 8.98 |
| 2026-06-16 12:00 | 06:01:42.62 | -68:00:14.2 | HIP 28563 | 8.38 |
| 2026-06-17 00:00 | 06:02:12.59 | -68:00:07.6 | HIP 28563 | 8.72 |
| 2026-06-17 12:00 | 06:02:42.58 | -68:00:01.7 | HIP 28563 | 9.89 |
| 2026-06-18 00:00 | 06:03:12.58 | -67:59:56.5 | HIP 28563 | 11.64 |
| 2026-06-18 12:00 | 06:03:42.60 | -67:59:52.0 | HIP 28563 | 13.77 |
| 2026-06-19 00:00 | 06:04:12.64 | -67:59:48.3 | HIP 28563 | 16.12 |
| 2026-06-19 12:00 | 06:04:42.69 | -67:59:45.3 | HIP 28563 | 18.60 |
| 2026-06-20 00:00 | 06:05:12.76 | -67:59:43.0 | HIP 28563 | 21.18 |
| 2026-06-20 12:00 | 06:05:42.84 | -67:59:41.5 | HIP 28563 | 23.82 |
| 2026-06-21 00:00 | 06:06:12.93 | -67:59:40.7 | HIP 28563 | 26.50 |
| 2026-06-21 12:00 | 06:06:43.04 | -67:59:40.6 | HIP 28563 | 29.21 |
| 2026-06-22 00:00 | 06:07:13.15 | -67:59:41.2 | HIP 28563 | 31.95 |