C/2020 J1 (SONEAR)
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) |
| 2026-02-03 00:00 |
09:11:20.19 |
+57:49:55.8 |
HIP 45181 |
31.91 |
| 2026-02-03 12:00 |
09:10:59.91 |
+57:50:33.6 |
HIP 45181 |
32.14 |
| 2026-02-04 00:00 |
09:10:39.63 |
+57:51:10.4 |
HIP 45181 |
32.62 |
| 2026-02-04 12:00 |
09:10:19.36 |
+57:51:46.2 |
HIP 45181 |
33.33 |
| 2026-02-05 00:00 |
09:09:59.09 |
+57:52:20.9 |
HIP 45181 |
34.27 |
| 2026-02-05 12:00 |
09:09:38.82 |
+57:52:54.6 |
HIP 45181 |
35.40 |
| 2026-02-06 00:00 |
09:09:18.56 |
+57:53:27.2 |
HIP 45181 |
36.72 |
| 2026-02-06 12:00 |
09:08:58.31 |
+57:53:58.8 |
HIP 45181 |
38.19 |
| 2026-02-07 00:00 |
09:08:38.07 |
+57:54:29.3 |
HIP 45181 |
39.81 |
| 2026-02-07 12:00 |
09:08:17.85 |
+57:54:58.7 |
HIP 45181 |
41.55 |
| 2026-02-08 00:00 |
09:07:57.64 |
+57:55:27.2 |
HIP 45181 |
43.40 |
| 2026-02-08 12:00 |
09:07:37.45 |
+57:55:54.5 |
HIP 45181 |
45.34 |
| 2026-02-09 00:00 |
09:07:17.28 |
+57:56:20.8 |
HIP 44492 |
45.30 |
| 2026-02-09 12:00 |
09:06:57.13 |
+57:56:46.1 |
HIP 44492 |
44.07 |
| 2026-02-10 00:00 |
09:06:37.00 |
+57:57:10.3 |
HIP 44492 |
42.98 |
| 2026-02-10 12:00 |
09:06:16.90 |
+57:57:33.4 |
HIP 44492 |
42.02 |
| 2026-02-11 00:00 |
09:05:56.83 |
+57:57:55.5 |
HIP 44492 |
41.20 |
| 2026-02-11 12:00 |
09:05:36.79 |
+57:58:16.6 |
HIP 44492 |
40.53 |
| 2026-02-12 00:00 |
09:05:16.78 |
+57:58:36.5 |
HIP 44492 |
40.02 |
| 2026-02-12 12:00 |
09:04:56.80 |
+57:58:55.5 |
HIP 44492 |
39.67 |
| 2026-02-13 00:00 |
09:04:36.86 |
+57:59:13.3 |
HIP 44492 |
39.48 |
| 2026-02-13 12:00 |
09:04:16.96 |
+57:59:30.1 |
HIP 44492 |
39.46 |
| 2026-02-14 00:00 |
09:03:57.09 |
+57:59:45.9 |
HIP 44492 |
39.60 |
| 2026-02-14 12:00 |
09:03:37.27 |
+58:00:00.6 |
HIP 44492 |
39.90 |
| 2026-02-15 00:00 |
09:03:17.49 |
+58:00:14.3 |
HIP 44492 |
40.36 |
| 2026-02-15 12:00 |
09:02:57.76 |
+58:00:26.9 |
HIP 44492 |
40.97 |
| 2026-02-16 00:00 |
09:02:38.08 |
+58:00:38.4 |
HIP 44492 |
41.71 |
| 2026-02-16 12:00 |
09:02:18.45 |
+58:00:49.0 |
HIP 43984 |
40.63 |
| 2026-02-17 00:00 |
09:01:58.86 |
+58:00:58.4 |
HIP 43984 |
38.13 |
| 2026-02-17 12:00 |
09:01:39.34 |
+58:01:06.9 |
HIP 43984 |
35.64 |
| 2026-02-18 00:00 |
09:01:19.87 |
+58:01:14.3 |
HIP 43984 |
33.19 |
| 2026-02-18 12:00 |
09:01:00.45 |
+58:01:20.6 |
HIP 43984 |
30.77 |
| 2026-02-19 00:00 |
09:00:41.10 |
+58:01:25.9 |
HIP 43984 |
28.39 |
| 2026-02-19 12:00 |
09:00:21.81 |
+58:01:30.2 |
HIP 43984 |
26.05 |
| 2026-02-20 00:00 |
09:00:02.58 |
+58:01:33.5 |
HIP 43984 |
23.78 |
| 2026-02-20 12:00 |
08:59:43.41 |
+58:01:35.7 |
HIP 43984 |
21.59 |
| 2026-02-21 00:00 |
08:59:24.32 |
+58:01:37.0 |
HIP 43984 |
19.49 |
| 2026-02-21 12:00 |
08:59:05.29 |
+58:01:37.2 |
HIP 43984 |
17.52 |
| 2026-02-22 00:00 |
08:58:46.33 |
+58:01:36.3 |
HIP 43984 |
15.73 |
| 2026-02-22 12:00 |
08:58:27.45 |
+58:01:34.5 |
HIP 43984 |
14.18 |
| 2026-02-23 00:00 |
08:58:08.64 |
+58:01:31.7 |
HIP 43984 |
12.94 |
| 2026-02-23 12:00 |
08:57:49.91 |
+58:01:27.9 |
HIP 43984 |
12.11 |
| 2026-02-24 00:00 |
08:57:31.25 |
+58:01:23.1 |
HIP 43984 |
11.77 |