メタデータ
| 項目 |
値 |
| Designation |
C/2025 J1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-06-11T19:29:30.477120Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:18Z |
| Obs used |
812 |
| NEO |
- |
| M1 |
8.100 |
| K1 |
11.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2025-05-02T23:26:46.752000Z |
| Discovery magnitude (MPC) |
19.30 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) |
2025-11-10.0000000 |
| e |
0.99709259 |
| q (au) |
3.580317 |
| a (au) |
1231.444995 |
| i (deg) |
95.444706 |
| Ω (om, deg) |
273.976197 |
| ω (w, deg) |
166.623946 |
| M (ma, deg) |
359.995123 |
等級
散乱 + 全体線形
$$
M_a = (9.074 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.074 |
| n |
6.000 |
| gf |
0.992 |
| gb |
-0.842 |
| 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
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 |
05:00:38.29 |
+51:03:03.3 |
HIP 23140 |
18.85 |
| 2026-03-26 12:00 |
05:00:58.07 |
+50:53:58.4 |
HIP 23389 |
12.02 |
| 2026-03-27 00:00 |
05:01:18.04 |
+50:44:56.1 |
HIP 23389 |
3.65 |
| 2026-03-27 12:00 |
05:01:38.21 |
+50:35:56.5 |
HIP 23389 |
8.05 |
| 2026-03-28 00:00 |
05:01:58.57 |
+50:26:59.5 |
HIP 23481 |
12.27 |
| 2026-03-28 12:00 |
05:02:19.11 |
+50:18:05.2 |
HIP 23481 |
18.85 |
| 2026-03-29 00:00 |
05:02:39.83 |
+50:09:13.5 |
HIP 23481 |
27.15 |
| 2026-03-29 12:00 |
05:03:00.74 |
+50:00:24.4 |
HIP 23609 |
22.53 |
| 2026-03-30 00:00 |
05:03:21.81 |
+49:51:38.0 |
HIP 23609 |
14.25 |
| 2026-03-30 12:00 |
05:03:43.06 |
+49:42:54.1 |
HIP 23609 |
8.63 |
| 2026-03-31 00:00 |
05:04:04.48 |
+49:34:12.8 |
HIP 23568 |
3.63 |
| 2026-03-31 12:00 |
05:04:26.06 |
+49:25:34.1 |
HIP 23568 |
6.34 |
| 2026-04-01 00:00 |
05:04:47.80 |
+49:16:57.9 |
HIP 23568 |
15.51 |
| 2026-04-01 12:00 |
05:05:09.70 |
+49:08:24.3 |
HIP 23568 |
24.76 |
| 2026-04-02 00:00 |
05:05:31.76 |
+48:59:53.2 |
HIP 23729 |
21.05 |
| 2026-04-02 12:00 |
05:05:53.97 |
+48:51:24.6 |
HIP 23729 |
11.98 |
| 2026-04-03 00:00 |
05:06:16.33 |
+48:42:58.5 |
HIP 23729 |
3.84 |
| 2026-04-03 12:00 |
05:06:38.84 |
+48:34:34.9 |
HIP 23751 |
3.44 |
| 2026-04-04 00:00 |
05:07:01.50 |
+48:26:13.8 |
HIP 23751 |
10.24 |
| 2026-04-04 12:00 |
05:07:24.30 |
+48:17:55.1 |
HIP 23751 |
19.11 |
| 2026-04-05 00:00 |
05:07:47.24 |
+48:09:38.9 |
HIP 23751 |
28.13 |
| 2026-04-05 12:00 |
05:08:10.31 |
+48:01:25.1 |
HIP 24077 |
24.50 |
| 2026-04-06 00:00 |
05:08:33.53 |
+47:53:13.7 |
HIP 24077 |
18.34 |
| 2026-04-06 12:00 |
05:08:56.87 |
+47:45:04.7 |
HIP 24077 |
15.33 |
| 2026-04-07 00:00 |
05:09:20.35 |
+47:36:58.0 |
HIP 24077 |
17.18 |
| 2026-04-07 12:00 |
05:09:43.95 |
+47:28:53.8 |
HIP 24077 |
22.71 |
| 2026-04-08 00:00 |
05:10:07.68 |
+47:20:51.9 |
HIP 24109 |
23.88 |
| 2026-04-08 12:00 |
05:10:31.54 |
+47:12:52.3 |
HIP 24109 |
15.25 |
| 2026-04-09 00:00 |
05:10:55.51 |
+47:04:55.0 |
HIP 24109 |
7.49 |
| 2026-04-09 12:00 |
05:11:19.61 |
+46:57:00.1 |
HIP 24198 |
3.87 |
| 2026-04-10 00:00 |
05:11:43.82 |
+46:49:07.4 |
HIP 24198 |
7.42 |
| 2026-04-10 12:00 |
05:12:08.15 |
+46:41:17.0 |
HIP 24241 |
15.03 |
| 2026-04-11 00:00 |
05:12:32.60 |
+46:33:28.9 |
HIP 24241 |
7.67 |
| 2026-04-11 12:00 |
05:12:57.15 |
+46:25:43.0 |
HIP 24241 |
7.01 |
| 2026-04-12 00:00 |
05:13:21.82 |
+46:17:59.3 |
HIP 24241 |
14.00 |
| 2026-04-12 12:00 |
05:13:46.59 |
+46:10:17.8 |
HIP 24241 |
22.33 |
| 2026-04-13 00:00 |
05:14:11.46 |
+46:02:38.6 |
HIP 24608 |
26.15 |
| 2026-04-13 12:00 |
05:14:36.45 |
+45:55:01.5 |
HIP 24608 |
22.25 |
| 2026-04-14 00:00 |
05:15:01.53 |
+45:47:26.5 |
HIP 24608 |
21.39 |
| 2026-04-14 12:00 |
05:15:26.71 |
+45:39:53.8 |
HIP 24608 |
23.89 |
| 2026-04-15 00:00 |
05:15:51.99 |
+45:32:23.1 |
HIP 24608 |
28.87 |
| 2026-04-15 12:00 |
05:16:17.37 |
+45:24:54.6 |
HIP 24608 |
35.28 |
| 2026-04-16 00:00 |
05:16:42.84 |
+45:17:28.1 |
HIP 24816 |
31.00 |