メタデータ
| 項目 |
値 |
| Designation |
C/2020 J1 (SONEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-04-18T14:32:05.205120Z |
| Orbit solution date (soln_date, UTC) |
2023-05-24T21:12:29Z |
| Obs used |
1423 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
7.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-05-01T06:33:40.896000Z |
| Discovery magnitude (MPC) |
17.00 R |
| Discovery observatory (MPC) |
Y00 · SONEAR Observatory, Oliveira |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-10-28.0000000 |
| e |
1.00036308 |
| q (au) |
3.355156 |
| a (au) |
-9240.744312 |
| i (deg) |
142.295628 |
| Ω (om, deg) |
226.582890 |
| ω (w, deg) |
341.755563 |
| M (ma, deg) |
0.000213 |
等級
散乱 + 全体線形
$$
M_a = (7.505 + 3.369\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.505 |
| n |
3.369 |
| gf |
0.833 |
| gb |
-0.500 |
| k |
0.921 |
| δ90 |
2.649 |
| 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 |
| 2020-04-19 |
2021-04-17 |
+0.2477 |
+0.184 |
| 2021-04-19 |
2021-12-01 |
-7.4917 |
+3.560 |
| 2021-12-01 |
2023-05-23 |
+6.0369 |
-4.382 |
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) |
| 2026-07-29 00:00 |
08:52:12.08 |
+53:14:39.9 |
HIP 43767 |
30.09 |
| 2026-07-29 12:00 |
08:52:22.05 |
+53:14:14.2 |
HIP 43767 |
28.63 |
| 2026-07-30 00:00 |
08:52:32.02 |
+53:13:49.1 |
HIP 43767 |
27.18 |
| 2026-07-30 12:00 |
08:52:41.99 |
+53:13:24.4 |
HIP 43767 |
25.75 |
| 2026-07-31 00:00 |
08:52:51.96 |
+53:13:00.3 |
HIP 43767 |
24.33 |
| 2026-07-31 12:00 |
08:53:01.93 |
+53:12:36.6 |
HIP 43767 |
22.94 |
| 2026-08-01 00:00 |
08:53:11.91 |
+53:12:13.5 |
HIP 43767 |
21.58 |
| 2026-08-01 12:00 |
08:53:21.88 |
+53:11:50.9 |
HIP 43767 |
20.25 |
| 2026-08-02 00:00 |
08:53:31.85 |
+53:11:28.7 |
HIP 43767 |
18.95 |
| 2026-08-02 12:00 |
08:53:41.83 |
+53:11:07.1 |
HIP 43767 |
17.70 |
| 2026-08-03 00:00 |
08:53:51.79 |
+53:10:46.0 |
HIP 43767 |
16.51 |
| 2026-08-03 12:00 |
08:54:01.76 |
+53:10:25.4 |
HIP 43767 |
15.39 |
| 2026-08-04 00:00 |
08:54:11.72 |
+53:10:05.3 |
HIP 43767 |
14.35 |
| 2026-08-04 12:00 |
08:54:21.68 |
+53:09:45.8 |
HIP 43767 |
13.42 |
| 2026-08-05 00:00 |
08:54:31.63 |
+53:09:26.7 |
HIP 43767 |
12.61 |
| 2026-08-05 12:00 |
08:54:41.58 |
+53:09:08.2 |
HIP 43767 |
11.95 |
| 2026-08-06 00:00 |
08:54:51.52 |
+53:08:50.2 |
HIP 43767 |
11.47 |
| 2026-08-06 12:00 |
08:55:01.46 |
+53:08:32.7 |
HIP 43767 |
11.19 |
| 2026-08-07 00:00 |
08:55:11.38 |
+53:08:15.8 |
HIP 43870 |
10.43 |
| 2026-08-07 12:00 |
08:55:21.30 |
+53:07:59.3 |
HIP 43870 |
8.99 |
| 2026-08-08 00:00 |
08:55:31.21 |
+53:07:43.4 |
HIP 43870 |
7.59 |
| 2026-08-08 12:00 |
08:55:41.12 |
+53:07:28.1 |
HIP 43870 |
6.24 |
| 2026-08-09 00:00 |
08:55:51.01 |
+53:07:13.2 |
HIP 43870 |
4.99 |
| 2026-08-09 12:00 |
08:56:00.89 |
+53:06:58.9 |
HIP 43870 |
3.93 |
| 2026-08-10 00:00 |
08:56:10.76 |
+53:06:45.2 |
HIP 43870 |
3.25 |
| 2026-08-10 12:00 |
08:56:20.61 |
+53:06:31.9 |
HIP 43870 |
3.20 |
| 2026-08-11 00:00 |
08:56:30.46 |
+53:06:19.2 |
HIP 43870 |
3.80 |
| 2026-08-11 12:00 |
08:56:40.29 |
+53:06:07.1 |
HIP 43870 |
4.81 |
| 2026-08-12 00:00 |
08:56:50.11 |
+53:05:55.5 |
HIP 43870 |
6.03 |
| 2026-08-12 12:00 |
08:56:59.91 |
+53:05:44.4 |
HIP 43870 |
7.34 |
| 2026-08-13 00:00 |
08:57:09.69 |
+53:05:33.9 |
HIP 43870 |
8.71 |
| 2026-08-13 12:00 |
08:57:19.46 |
+53:05:24.0 |
HIP 43870 |
10.11 |
| 2026-08-14 00:00 |
08:57:29.22 |
+53:05:14.6 |
HIP 43870 |
11.53 |
| 2026-08-14 12:00 |
08:57:38.95 |
+53:05:05.7 |
HIP 43870 |
12.96 |
| 2026-08-15 00:00 |
08:57:48.67 |
+53:04:57.4 |
HIP 43870 |
14.40 |
| 2026-08-15 12:00 |
08:57:58.36 |
+53:04:49.6 |
HIP 43870 |
15.84 |
| 2026-08-16 00:00 |
08:58:08.04 |
+53:04:42.4 |
HIP 43870 |
17.28 |
| 2026-08-16 12:00 |
08:58:17.69 |
+53:04:35.8 |
HIP 43870 |
18.72 |
| 2026-08-17 00:00 |
08:58:27.33 |
+53:04:29.7 |
HIP 43870 |
20.16 |
| 2026-08-17 12:00 |
08:58:36.94 |
+53:04:24.2 |
HIP 43870 |
21.60 |
| 2026-08-18 00:00 |
08:58:46.53 |
+53:04:19.2 |
HIP 44209 |
20.80 |
| 2026-08-18 12:00 |
08:58:56.10 |
+53:04:14.8 |
HIP 44209 |
19.93 |
| 2026-08-19 00:00 |
08:59:05.64 |
+53:04:11.0 |
HIP 44209 |
19.13 |