メタデータ
| 項目 |
値 |
| Designation |
C/2020 S3 (Erasmus) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-12T16:07:52.118400Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:18Z |
| Obs used |
861 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-17T14:40:43.536000Z |
| Discovery magnitude (MPC) |
18.48 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-03-11.0000000 |
| e |
0.99795482 |
| q (au) |
0.398469 |
| a (au) |
194.833484 |
| i (deg) |
19.861463 |
| Ω (om, deg) |
222.992545 |
| ω (w, deg) |
349.885700 |
| M (ma, deg) |
0.032012 |
等級
散乱 + 全体線形
$$
M_a = (10.351 + 5.209\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.351 |
| n |
5.209 |
| gf |
1.000 |
| gb |
-0.884 |
| k |
0.958 |
| 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 |
| 2020-09-17 |
2020-10-17 |
+19.9753 |
-1.996 |
| 2020-10-17 |
2020-11-05 |
-0.9153 |
-0.033 |
| 2020-11-05 |
2020-12-09 |
-2.1755 |
-0.819 |
| 2020-12-18 |
2020-12-28 |
+3.4304 |
+1.116 |
| 2020-12-28 |
2021-07-09 |
-1.2828 |
-0.363 |
| 2021-07-09 |
2021-09-12 |
+18.1671 |
-11.093 |
| 2021-09-12 |
2021-11-27 |
-10.8203 |
+6.847 |
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 |
00:59:00.70 |
+15:39:54.8 |
HIP 4666 |
14.14 |
| 2026-06-01 12:00 |
00:59:04.74 |
+15:40:30.3 |
HIP 4666 |
13.03 |
| 2026-06-02 00:00 |
00:59:08.73 |
+15:41:05.7 |
HIP 4666 |
11.95 |
| 2026-06-02 12:00 |
00:59:12.68 |
+15:41:40.9 |
HIP 4666 |
10.88 |
| 2026-06-03 00:00 |
00:59:16.59 |
+15:42:15.9 |
HIP 4666 |
9.84 |
| 2026-06-03 12:00 |
00:59:20.46 |
+15:42:50.8 |
HIP 4666 |
8.82 |
| 2026-06-04 00:00 |
00:59:24.28 |
+15:43:25.4 |
HIP 4666 |
7.83 |
| 2026-06-04 12:00 |
00:59:28.06 |
+15:44:00.0 |
HIP 4666 |
6.88 |
| 2026-06-05 00:00 |
00:59:31.80 |
+15:44:34.2 |
HIP 4666 |
5.99 |
| 2026-06-05 12:00 |
00:59:35.49 |
+15:45:08.3 |
HIP 4666 |
5.17 |
| 2026-06-06 00:00 |
00:59:39.14 |
+15:45:42.2 |
HIP 4666 |
4.46 |
| 2026-06-06 12:00 |
00:59:42.74 |
+15:46:16.0 |
HIP 4666 |
3.92 |
| 2026-06-07 00:00 |
00:59:46.30 |
+15:46:49.5 |
HIP 4666 |
3.60 |
| 2026-06-07 12:00 |
00:59:49.82 |
+15:47:22.9 |
HIP 4666 |
3.56 |
| 2026-06-08 00:00 |
00:59:53.29 |
+15:47:56.0 |
HIP 4666 |
3.79 |
| 2026-06-08 12:00 |
00:59:56.71 |
+15:48:29.0 |
HIP 4666 |
4.25 |
| 2026-06-09 00:00 |
01:00:00.09 |
+15:49:01.7 |
HIP 4666 |
4.87 |
| 2026-06-09 12:00 |
01:00:03.42 |
+15:49:34.3 |
HIP 4666 |
5.59 |
| 2026-06-10 00:00 |
01:00:06.71 |
+15:50:06.6 |
HIP 4666 |
6.36 |
| 2026-06-10 12:00 |
01:00:09.95 |
+15:50:38.7 |
HIP 4666 |
7.17 |
| 2026-06-11 00:00 |
01:00:13.14 |
+15:51:10.7 |
HIP 4666 |
8.00 |
| 2026-06-11 12:00 |
01:00:16.29 |
+15:51:42.4 |
HIP 4666 |
8.85 |
| 2026-06-12 00:00 |
01:00:19.39 |
+15:52:13.9 |
HIP 4666 |
9.69 |
| 2026-06-12 12:00 |
01:00:22.45 |
+15:52:45.1 |
HIP 4666 |
10.54 |
| 2026-06-13 00:00 |
01:00:25.45 |
+15:53:16.2 |
HIP 4666 |
11.39 |
| 2026-06-13 12:00 |
01:00:28.41 |
+15:53:47.0 |
HIP 4666 |
12.23 |
| 2026-06-14 00:00 |
01:00:31.32 |
+15:54:17.6 |
HIP 4666 |
13.07 |
| 2026-06-14 12:00 |
01:00:34.18 |
+15:54:48.0 |
HIP 4666 |
13.90 |
| 2026-06-15 00:00 |
01:00:36.99 |
+15:55:18.2 |
HIP 4666 |
14.72 |
| 2026-06-15 12:00 |
01:00:39.75 |
+15:55:48.1 |
HIP 4666 |
15.54 |
| 2026-06-16 00:00 |
01:00:42.47 |
+15:56:17.8 |
HIP 4666 |
16.34 |
| 2026-06-16 12:00 |
01:00:45.13 |
+15:56:47.3 |
HIP 4666 |
17.14 |
| 2026-06-17 00:00 |
01:00:47.75 |
+15:57:16.5 |
HIP 4666 |
17.92 |
| 2026-06-17 12:00 |
01:00:50.31 |
+15:57:45.5 |
HIP 4666 |
18.70 |
| 2026-06-18 00:00 |
01:00:52.83 |
+15:58:14.2 |
HIP 4666 |
19.46 |
| 2026-06-18 12:00 |
01:00:55.29 |
+15:58:42.7 |
HIP 4666 |
20.22 |
| 2026-06-19 00:00 |
01:00:57.71 |
+15:59:10.9 |
HIP 4666 |
20.96 |
| 2026-06-19 12:00 |
01:01:00.08 |
+15:59:39.0 |
HIP 4666 |
21.69 |
| 2026-06-20 00:00 |
01:01:02.39 |
+16:00:06.7 |
HIP 4754 |
22.29 |
| 2026-06-20 12:00 |
01:01:04.65 |
+16:00:34.2 |
HIP 4754 |
21.81 |
| 2026-06-21 00:00 |
01:01:06.87 |
+16:01:01.5 |
HIP 4754 |
21.36 |
| 2026-06-21 12:00 |
01:01:09.03 |
+16:01:28.5 |
HIP 4754 |
20.92 |
| 2026-06-22 00:00 |
01:01:11.14 |
+16:01:55.2 |
HIP 4754 |
20.49 |