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) | 2031-01-26T12:14:11.636160Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T09:42:17Z |
| Obs used | 2109 |
| NEO | - |
| M1 | 5.700 |
| 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) | 2021-09-30.0000000 |
| e | 0.99883073 |
| q (au) | 10.935206 |
| a (au) | 9352.178794 |
| i (deg) | 95.440172 |
| Ω (om, deg) | 189.918625 |
| ω (w, deg) | 326.362286 |
| M (ma, deg) | 359.996289 |
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 | -0.746 |
| 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 | -4.9477 | +6.295 |
| 2024-05-22 | 2026-03-25 | +12.0334 | -14.029 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 04:53:37.08 | -70:45:03.7 | HIP 22974 | 14.95 |
| 2026-03-26 12:00 | 04:53:52.75 | -70:43:23.4 | HIP 22974 | 14.00 |
| 2026-03-27 00:00 | 04:54:08.58 | -70:41:43.3 | HIP 22974 | 13.31 |
| 2026-03-27 12:00 | 04:54:24.57 | -70:40:03.6 | HIP 22974 | 12.92 |
| 2026-03-28 00:00 | 04:54:40.73 | -70:38:24.1 | HIP 22974 | 12.85 |
| 2026-03-28 12:00 | 04:54:57.05 | -70:36:45.0 | HIP 22974 | 13.12 |
| 2026-03-29 00:00 | 04:55:13.52 | -70:35:06.1 | HIP 22974 | 13.71 |
| 2026-03-29 12:00 | 04:55:30.16 | -70:33:27.5 | HIP 22974 | 14.57 |
| 2026-03-30 00:00 | 04:55:46.95 | -70:31:49.3 | HIP 22974 | 15.68 |
| 2026-03-30 12:00 | 04:56:03.89 | -70:30:11.3 | HIP 22974 | 16.97 |
| 2026-03-31 00:00 | 04:56:21.00 | -70:28:33.6 | HIP 22974 | 18.43 |
| 2026-03-31 12:00 | 04:56:38.25 | -70:26:56.3 | HIP 22974 | 20.00 |
| 2026-04-01 00:00 | 04:56:55.66 | -70:25:19.3 | HIP 22974 | 21.67 |
| 2026-04-01 12:00 | 04:57:13.22 | -70:23:42.6 | HIP 23294 | 22.01 |
| 2026-04-02 00:00 | 04:57:30.93 | -70:22:06.3 | HIP 23294 | 21.98 |
| 2026-04-02 12:00 | 04:57:48.79 | -70:20:30.2 | HIP 23294 | 22.14 |
| 2026-04-03 00:00 | 04:58:06.80 | -70:18:54.6 | HIP 23294 | 22.50 |
| 2026-04-03 12:00 | 04:58:24.96 | -70:17:19.2 | HIP 23397 | 22.22 |
| 2026-04-04 00:00 | 04:58:43.26 | -70:15:44.3 | HIP 23397 | 20.02 |
| 2026-04-04 12:00 | 04:59:01.71 | -70:14:09.6 | HIP 23397 | 17.81 |
| 2026-04-05 00:00 | 04:59:20.31 | -70:12:35.4 | HIP 23397 | 15.61 |
| 2026-04-05 12:00 | 04:59:39.04 | -70:11:01.5 | HIP 23397 | 13.39 |
| 2026-04-06 00:00 | 04:59:57.93 | -70:09:28.0 | HIP 23397 | 11.18 |
| 2026-04-06 12:00 | 05:00:16.95 | -70:07:54.8 | HIP 23397 | 8.97 |
| 2026-04-07 00:00 | 05:00:36.11 | -70:06:22.0 | HIP 23397 | 6.76 |
| 2026-04-07 12:00 | 05:00:55.42 | -70:04:49.6 | HIP 23397 | 4.59 |
| 2026-04-08 00:00 | 05:01:14.86 | -70:03:17.6 | HIP 23397 | 2.55 |
| 2026-04-08 12:00 | 05:01:34.44 | -70:01:46.0 | HIP 23397 | 1.43 |
| 2026-04-09 00:00 | 05:01:54.16 | -70:00:14.8 | HIP 23397 | 2.79 |
| 2026-04-09 12:00 | 05:02:14.02 | -69:58:44.0 | HIP 23397 | 4.89 |
| 2026-04-10 00:00 | 05:02:34.01 | -69:57:13.6 | HIP 23397 | 7.10 |
| 2026-04-10 12:00 | 05:02:54.13 | -69:55:43.6 | HIP 23397 | 9.34 |
| 2026-04-11 00:00 | 05:03:14.39 | -69:54:14.0 | HIP 23397 | 11.61 |
| 2026-04-11 12:00 | 05:03:34.78 | -69:52:44.9 | HIP 23397 | 13.88 |
| 2026-04-12 00:00 | 05:03:55.31 | -69:51:16.2 | HIP 23397 | 16.17 |
| 2026-04-12 12:00 | 05:04:15.96 | -69:49:47.9 | HIP 23397 | 18.47 |
| 2026-04-13 00:00 | 05:04:36.74 | -69:48:20.0 | HIP 23397 | 20.77 |
| 2026-04-13 12:00 | 05:04:57.66 | -69:46:52.6 | HIP 23397 | 23.08 |
| 2026-04-14 00:00 | 05:05:18.70 | -69:45:25.6 | HIP 23397 | 25.39 |
| 2026-04-14 12:00 | 05:05:39.87 | -69:43:59.1 | HIP 23397 | 27.71 |
| 2026-04-15 00:00 | 05:06:01.16 | -69:42:33.0 | HIP 23397 | 30.04 |
| 2026-04-15 12:00 | 05:06:22.58 | -69:41:07.4 | HIP 24173 | 27.89 |
| 2026-04-16 00:00 | 05:06:44.12 | -69:39:42.3 | HIP 24173 | 25.70 |