メタデータ
| 項目 |
値 |
| Designation |
C/2019 Q4 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-12-08T13:16:05.885760Z |
| Orbit solution date (soln_date, UTC) |
2024-06-24T15:49:04Z |
| Obs used |
964 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-08-30T01:03:19.872000Z |
| Discovery magnitude (MPC) |
17.80 R |
| 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) |
2020-01-05.0000000 |
| e |
3.35647578 |
| q (au) |
2.006521 |
| a (au) |
-0.851492 |
| i (deg) |
44.052642 |
| Ω (om, deg) |
308.147729 |
| ω (w, deg) |
209.123686 |
| M (ma, deg) |
34.429470 |
等級
散乱 + 全体線形
$$
M_a = (14.853 + 2.256\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.853 |
| n |
2.256 |
| gf |
1.000 |
| gb |
-0.706 |
| 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 |
| 2018-12-13 |
2019-12-08 |
+1.5408 |
-0.661 |
| 2019-12-08 |
2020-03-05 |
+1.5873 |
-0.696 |
| 2020-03-05 |
2020-09-30 |
+12.2394 |
-6.131 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
18:06:41.20 |
-54:32:27.8 |
HIP 88802 |
9.45 |
| 2026-06-01 12:00 |
18:06:37.29 |
-54:32:33.6 |
HIP 88802 |
9.92 |
| 2026-06-02 00:00 |
18:06:33.37 |
-54:32:39.3 |
HIP 88802 |
10.41 |
| 2026-06-02 12:00 |
18:06:29.44 |
-54:32:44.7 |
HIP 88802 |
10.91 |
| 2026-06-03 00:00 |
18:06:25.49 |
-54:32:50.0 |
HIP 88802 |
11.42 |
| 2026-06-03 12:00 |
18:06:21.53 |
-54:32:55.2 |
HIP 88802 |
11.94 |
| 2026-06-04 00:00 |
18:06:17.56 |
-54:33:00.2 |
HIP 88802 |
12.47 |
| 2026-06-04 12:00 |
18:06:13.58 |
-54:33:05.0 |
HIP 88802 |
13.00 |
| 2026-06-05 00:00 |
18:06:09.59 |
-54:33:09.6 |
HIP 88802 |
13.54 |
| 2026-06-05 12:00 |
18:06:05.59 |
-54:33:14.1 |
HIP 88802 |
14.09 |
| 2026-06-06 00:00 |
18:06:01.58 |
-54:33:18.4 |
HIP 88802 |
14.64 |
| 2026-06-06 12:00 |
18:05:57.56 |
-54:33:22.5 |
HIP 88802 |
15.19 |
| 2026-06-07 00:00 |
18:05:53.53 |
-54:33:26.5 |
HIP 88802 |
15.75 |
| 2026-06-07 12:00 |
18:05:49.49 |
-54:33:30.3 |
HIP 88802 |
16.32 |
| 2026-06-08 00:00 |
18:05:45.44 |
-54:33:33.9 |
HIP 88802 |
16.88 |
| 2026-06-08 12:00 |
18:05:41.39 |
-54:33:37.4 |
HIP 88802 |
17.45 |
| 2026-06-09 00:00 |
18:05:37.32 |
-54:33:40.6 |
HIP 88802 |
18.02 |
| 2026-06-09 12:00 |
18:05:33.25 |
-54:33:43.7 |
HIP 88802 |
18.60 |
| 2026-06-10 00:00 |
18:05:29.17 |
-54:33:46.7 |
HIP 88802 |
19.18 |
| 2026-06-10 12:00 |
18:05:25.09 |
-54:33:49.4 |
HIP 88802 |
19.76 |
| 2026-06-11 00:00 |
18:05:21.00 |
-54:33:52.0 |
HIP 88802 |
20.34 |
| 2026-06-11 12:00 |
18:05:16.90 |
-54:33:54.4 |
HIP 88802 |
20.92 |
| 2026-06-12 00:00 |
18:05:12.79 |
-54:33:56.7 |
HIP 88802 |
21.51 |
| 2026-06-12 12:00 |
18:05:08.68 |
-54:33:58.8 |
HIP 88802 |
22.09 |
| 2026-06-13 00:00 |
18:05:04.57 |
-54:34:00.7 |
HIP 88802 |
22.68 |
| 2026-06-13 12:00 |
18:05:00.44 |
-54:34:02.4 |
HIP 88802 |
23.27 |
| 2026-06-14 00:00 |
18:04:56.32 |
-54:34:03.9 |
HIP 88802 |
23.86 |
| 2026-06-14 12:00 |
18:04:52.19 |
-54:34:05.3 |
HIP 88802 |
24.46 |
| 2026-06-15 00:00 |
18:04:48.06 |
-54:34:06.5 |
HIP 88802 |
25.05 |
| 2026-06-15 12:00 |
18:04:43.92 |
-54:34:07.5 |
HIP 88802 |
25.65 |
| 2026-06-16 00:00 |
18:04:39.78 |
-54:34:08.3 |
HIP 88802 |
26.24 |
| 2026-06-16 12:00 |
18:04:35.64 |
-54:34:09.0 |
HIP 88802 |
26.84 |
| 2026-06-17 00:00 |
18:04:31.49 |
-54:34:09.5 |
HIP 88802 |
27.44 |
| 2026-06-17 12:00 |
18:04:27.35 |
-54:34:09.8 |
HIP 88802 |
28.03 |
| 2026-06-18 00:00 |
18:04:23.20 |
-54:34:09.9 |
HIP 88802 |
28.63 |
| 2026-06-18 12:00 |
18:04:19.05 |
-54:34:09.9 |
HIP 88802 |
29.23 |
| 2026-06-19 00:00 |
18:04:14.90 |
-54:34:09.7 |
HIP 88802 |
29.83 |
| 2026-06-19 12:00 |
18:04:10.75 |
-54:34:09.3 |
HIP 88802 |
30.43 |
| 2026-06-20 00:00 |
18:04:06.60 |
-54:34:08.7 |
HIP 88802 |
31.03 |
| 2026-06-20 12:00 |
18:04:02.44 |
-54:34:08.0 |
HIP 88802 |
31.63 |
| 2026-06-21 00:00 |
18:03:58.29 |
-54:34:07.1 |
HIP 88802 |
32.23 |
| 2026-06-21 12:00 |
18:03:54.14 |
-54:34:06.0 |
HIP 88178 |
32.18 |
| 2026-06-22 00:00 |
18:03:50.00 |
-54:34:04.7 |
HIP 88178 |
31.62 |