C/2025 V1 (Borisov)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2025 V1 (Borisov) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-11-16T13:01:46.663680Z |
| Orbit solution date (soln_date, UTC) | 2026-01-07T15:42:51Z |
| Obs used | 116 |
| NEO | - |
| M1 | 15.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2025-11-02T02:35:59.712000Z |
| Discovery magnitude (MPC) | 12.00 G |
| Discovery observatory (MPC) | L51 · MARGO, Nauchnyi |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-11-04.0000000 |
| e | 1.00773223 |
| q (au) | 0.462678 |
| a (au) | -59.837579 |
| i (deg) | 112.709493 |
| Ω (om, deg) | 91.873735 |
| ω (w, deg) | 47.568121 |
| M (ma, deg) | -0.026708 |
等級
散乱 + 全体線形
$$ M_a = (15.462 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.462 |
| n | 2.000 |
| gf | 0.800 |
| gb | -1.000 |
| k | 0.800 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2025-10-29 | 2025-11-03 | +89.0285 | +20.293 |
| 2025-11-03 | 2025-11-08 | -70.7520 | -18.910 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 16:52:28.75 | -31:43:10.2 | HIP 82546 | 6.32 |
| 2026-09-20 12:00 | 16:52:36.27 | -31:43:36.0 | HIP 82546 | 6.58 |
| 2026-09-21 00:00 | 16:52:43.98 | -31:44:02.0 | HIP 82546 | 7.24 |
| 2026-09-21 12:00 | 16:52:51.89 | -31:44:28.3 | HIP 82546 | 8.24 |
| 2026-09-22 00:00 | 16:52:59.99 | -31:44:54.8 | HIP 82596 | 8.02 |
| 2026-09-22 12:00 | 16:53:08.28 | -31:45:21.7 | HIP 82596 | 7.46 |
| 2026-09-23 00:00 | 16:53:16.76 | -31:45:48.8 | HIP 82596 | 7.33 |
| 2026-09-23 12:00 | 16:53:25.42 | -31:46:16.2 | HIP 82596 | 7.68 |
| 2026-09-24 00:00 | 16:53:34.27 | -31:46:43.9 | HIP 82596 | 8.47 |
| 2026-09-24 12:00 | 16:53:43.30 | -31:47:11.8 | HIP 82596 | 9.62 |
| 2026-09-25 00:00 | 16:53:52.51 | -31:47:40.1 | HIP 82596 | 11.04 |
| 2026-09-25 12:00 | 16:54:01.90 | -31:48:08.6 | HIP 82596 | 12.66 |
| 2026-09-26 00:00 | 16:54:11.47 | -31:48:37.3 | HIP 82596 | 14.42 |
| 2026-09-26 12:00 | 16:54:21.22 | -31:49:06.4 | HIP 82596 | 16.29 |
| 2026-09-27 00:00 | 16:54:31.13 | -31:49:35.7 | HIP 82596 | 18.26 |
| 2026-09-27 12:00 | 16:54:41.22 | -31:50:05.3 | HIP 82834 | 18.40 |
| 2026-09-28 00:00 | 16:54:51.48 | -31:50:35.1 | HIP 82834 | 16.66 |
| 2026-09-28 12:00 | 16:55:01.91 | -31:51:05.2 | HIP 82834 | 15.02 |
| 2026-09-29 00:00 | 16:55:12.50 | -31:51:35.6 | HIP 82834 | 13.54 |
| 2026-09-29 12:00 | 16:55:23.26 | -31:52:06.2 | HIP 82834 | 12.31 |
| 2026-09-30 00:00 | 16:55:34.18 | -31:52:37.0 | HIP 82834 | 11.42 |
| 2026-09-30 12:00 | 16:55:45.27 | -31:53:08.2 | HIP 82834 | 10.99 |
| 2026-10-01 00:00 | 16:55:56.51 | -31:53:39.6 | HIP 82834 | 11.08 |
| 2026-10-01 12:00 | 16:56:07.91 | -31:54:11.2 | HIP 82834 | 11.70 |
| 2026-10-02 00:00 | 16:56:19.47 | -31:54:43.1 | HIP 82834 | 12.80 |
| 2026-10-02 12:00 | 16:56:31.19 | -31:55:15.2 | HIP 82834 | 14.29 |
| 2026-10-03 00:00 | 16:56:43.06 | -31:55:47.6 | HIP 82834 | 16.07 |
| 2026-10-03 12:00 | 16:56:55.08 | -31:56:20.3 | HIP 83026 | 13.70 |
| 2026-10-04 00:00 | 16:57:07.26 | -31:56:53.1 | HIP 83026 | 11.08 |
| 2026-10-04 12:00 | 16:57:19.59 | -31:57:26.3 | HIP 83026 | 8.43 |
| 2026-10-05 00:00 | 16:57:32.06 | -31:57:59.6 | HIP 83026 | 5.78 |
| 2026-10-05 12:00 | 16:57:44.68 | -31:58:33.2 | HIP 83026 | 3.18 |
| 2026-10-06 00:00 | 16:57:57.45 | -31:59:07.1 | HIP 83026 | 1.33 |
| 2026-10-06 12:00 | 16:58:10.36 | -31:59:41.2 | HIP 83026 | 2.98 |
| 2026-10-07 00:00 | 16:58:23.41 | -32:00:15.5 | HIP 83035 | 5.29 |
| 2026-10-07 12:00 | 16:58:36.60 | -32:00:50.0 | HIP 83035 | 7.23 |
| 2026-10-08 00:00 | 16:58:49.94 | -32:01:24.8 | HIP 83035 | 9.66 |
| 2026-10-08 12:00 | 16:59:03.41 | -32:01:59.8 | HIP 83035 | 12.32 |
| 2026-10-09 00:00 | 16:59:17.02 | -32:02:35.1 | HIP 83035 | 15.10 |
| 2026-10-09 12:00 | 16:59:30.76 | -32:03:10.5 | HIP 83035 | 17.96 |
| 2026-10-10 00:00 | 16:59:44.63 | -32:03:46.2 | HIP 83035 | 20.88 |
| 2026-10-10 12:00 | 16:59:58.64 | -32:04:22.1 | HIP 83251 | 21.49 |
| 2026-10-11 00:00 | 17:00:12.78 | -32:04:58.3 | HIP 83251 | 20.48 |