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) | 2031-01-25T17:51:56.687040Z |
| Orbit solution date (soln_date, UTC) | 2026-07-28T14:12:16Z |
| Obs used | 2265 |
| 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) | 2021-12-15.0000000 |
| e | 0.99919532 |
| q (au) | 10.937075 |
| a (au) | 13591.789407 |
| i (deg) | 95.436967 |
| Ω (om, deg) | 189.912386 |
| ω (w, deg) | 326.341403 |
| M (ma, deg) | 359.997930 |
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 | -4.4546 | +5.657 |
| 2024-05-22 | 2026-07-21 | +9.8304 | -11.433 |
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 | 06:44:04.82 | -68:33:35.2 | HIP 32108 | 19.70 |
| 2026-07-29 12:00 | 06:44:33.78 | -68:34:28.8 | HIP 32604 | 21.69 |
| 2026-07-30 00:00 | 06:45:02.69 | -68:35:23.1 | HIP 32604 | 19.75 |
| 2026-07-30 12:00 | 06:45:31.56 | -68:36:18.0 | HIP 32604 | 18.05 |
| 2026-07-31 00:00 | 06:46:00.38 | -68:37:13.6 | HIP 32604 | 16.66 |
| 2026-07-31 12:00 | 06:46:29.16 | -68:38:09.8 | HIP 32604 | 15.67 |
| 2026-08-01 00:00 | 06:46:57.89 | -68:39:06.7 | HIP 32604 | 15.15 |
| 2026-08-01 12:00 | 06:47:26.58 | -68:40:04.3 | HIP 32604 | 15.15 |
| 2026-08-02 00:00 | 06:47:55.22 | -68:41:02.5 | HIP 32736 | 13.90 |
| 2026-08-02 12:00 | 06:48:23.81 | -68:42:01.4 | HIP 32736 | 13.05 |
| 2026-08-03 00:00 | 06:48:52.35 | -68:43:00.9 | HIP 32736 | 12.78 |
| 2026-08-03 12:00 | 06:49:20.84 | -68:44:01.0 | HIP 32736 | 13.12 |
| 2026-08-04 00:00 | 06:49:49.28 | -68:45:01.8 | HIP 32736 | 14.03 |
| 2026-08-04 12:00 | 06:50:17.66 | -68:46:03.3 | HIP 32736 | 15.40 |
| 2026-08-05 00:00 | 06:50:46.00 | -68:47:05.4 | HIP 32736 | 17.12 |
| 2026-08-05 12:00 | 06:51:14.28 | -68:48:08.1 | HIP 33172 | 18.78 |
| 2026-08-06 00:00 | 06:51:42.51 | -68:49:11.5 | HIP 33172 | 16.05 |
| 2026-08-06 12:00 | 06:52:10.69 | -68:50:15.5 | HIP 33172 | 13.32 |
| 2026-08-07 00:00 | 06:52:38.80 | -68:51:20.2 | HIP 33172 | 10.61 |
| 2026-08-07 12:00 | 06:53:06.86 | -68:52:25.5 | HIP 33172 | 7.93 |
| 2026-08-08 00:00 | 06:53:34.87 | -68:53:31.4 | HIP 33172 | 5.31 |
| 2026-08-08 12:00 | 06:54:02.81 | -68:54:38.0 | HIP 33172 | 2.94 |
| 2026-08-09 00:00 | 06:54:30.70 | -68:55:45.2 | HIP 33172 | 2.04 |
| 2026-08-09 12:00 | 06:54:58.52 | -68:56:53.0 | HIP 33172 | 3.83 |
| 2026-08-10 00:00 | 06:55:26.29 | -68:58:01.4 | HIP 33172 | 6.33 |
| 2026-08-10 12:00 | 06:55:53.99 | -68:59:10.5 | HIP 33172 | 8.97 |
| 2026-08-11 00:00 | 06:56:21.63 | -69:00:20.2 | HIP 33172 | 11.65 |
| 2026-08-11 12:00 | 06:56:49.20 | -69:01:30.6 | HIP 33172 | 14.34 |
| 2026-08-12 00:00 | 06:57:16.71 | -69:02:41.5 | HIP 33172 | 17.04 |
| 2026-08-12 12:00 | 06:57:44.15 | -69:03:53.1 | HIP 33172 | 19.75 |
| 2026-08-13 00:00 | 06:58:11.53 | -69:05:05.3 | HIP 33172 | 22.45 |
| 2026-08-13 12:00 | 06:58:38.83 | -69:06:18.1 | HIP 33172 | 25.16 |
| 2026-08-14 00:00 | 06:59:06.07 | -69:07:31.5 | HIP 33172 | 27.86 |
| 2026-08-14 12:00 | 06:59:33.24 | -69:08:45.5 | HIP 33172 | 30.56 |
| 2026-08-15 00:00 | 07:00:00.33 | -69:10:00.1 | HIP 33172 | 33.26 |
| 2026-08-15 12:00 | 07:00:27.35 | -69:11:15.3 | HIP 33172 | 35.96 |
| 2026-08-16 00:00 | 07:00:54.30 | -69:12:31.1 | HIP 34270 | 36.27 |
| 2026-08-16 12:00 | 07:01:21.18 | -69:13:47.5 | HIP 34270 | 35.23 |
| 2026-08-17 00:00 | 07:01:47.98 | -69:15:04.4 | HIP 34270 | 34.39 |
| 2026-08-17 12:00 | 07:02:14.70 | -69:16:22.0 | HIP 34270 | 33.77 |
| 2026-08-18 00:00 | 07:02:41.35 | -69:17:40.2 | HIP 34270 | 33.37 |
| 2026-08-18 12:00 | 07:03:07.92 | -69:18:58.9 | HIP 34270 | 33.20 |
| 2026-08-19 00:00 | 07:03:34.42 | -69:20:18.2 | HIP 34270 | 33.26 |