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 |
-0.883 |
| 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 |
+19.9760 |
-1.996 |
| 2020-10-17 |
2020-11-05 |
-0.9147 |
-0.033 |
| 2020-11-05 |
2020-12-09 |
-2.1755 |
-0.819 |
| 2020-12-18 |
2020-12-28 |
+3.4301 |
+1.116 |
| 2020-12-28 |
2021-07-09 |
-1.2827 |
-0.363 |
| 2021-07-09 |
2021-09-12 |
+18.1641 |
-11.091 |
| 2021-09-12 |
2021-11-27 |
-10.8184 |
+6.846 |
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) |
| 2026-05-12 00:00 |
00:55:47.83 |
+15:14:16.8 |
HIP 4400 |
16.50 |
| 2026-05-12 12:00 |
00:55:53.33 |
+15:14:57.4 |
HIP 4400 |
16.38 |
| 2026-05-13 00:00 |
00:55:58.79 |
+15:15:38.0 |
HIP 4400 |
16.40 |
| 2026-05-13 12:00 |
00:56:04.23 |
+15:16:18.4 |
HIP 4400 |
16.55 |
| 2026-05-14 00:00 |
00:56:09.63 |
+15:16:58.8 |
HIP 4400 |
16.84 |
| 2026-05-14 12:00 |
00:56:15.00 |
+15:17:39.1 |
HIP 4400 |
17.24 |
| 2026-05-15 00:00 |
00:56:20.34 |
+15:18:19.3 |
HIP 4400 |
17.75 |
| 2026-05-15 12:00 |
00:56:25.65 |
+15:18:59.4 |
HIP 4400 |
18.37 |
| 2026-05-16 00:00 |
00:56:30.92 |
+15:19:39.5 |
HIP 4400 |
19.07 |
| 2026-05-16 12:00 |
00:56:36.17 |
+15:20:19.4 |
HIP 4387 |
19.82 |
| 2026-05-17 00:00 |
00:56:41.38 |
+15:20:59.2 |
HIP 4387 |
19.58 |
| 2026-05-17 12:00 |
00:56:46.55 |
+15:21:38.9 |
HIP 4387 |
19.44 |
| 2026-05-18 00:00 |
00:56:51.69 |
+15:22:18.5 |
HIP 4387 |
19.39 |
| 2026-05-18 12:00 |
00:56:56.80 |
+15:22:58.0 |
HIP 4387 |
19.45 |
| 2026-05-19 00:00 |
00:57:01.87 |
+15:23:37.4 |
HIP 4387 |
19.60 |
| 2026-05-19 12:00 |
00:57:06.91 |
+15:24:16.7 |
HIP 4387 |
19.84 |
| 2026-05-20 00:00 |
00:57:11.91 |
+15:24:55.8 |
HIP 4387 |
20.17 |
| 2026-05-20 12:00 |
00:57:16.88 |
+15:25:34.9 |
HIP 4387 |
20.58 |
| 2026-05-21 00:00 |
00:57:21.81 |
+15:26:13.8 |
HIP 4387 |
21.07 |
| 2026-05-21 12:00 |
00:57:26.71 |
+15:26:52.6 |
HIP 4387 |
21.62 |
| 2026-05-22 00:00 |
00:57:31.57 |
+15:27:31.2 |
HIP 4387 |
22.24 |
| 2026-05-22 12:00 |
00:57:36.39 |
+15:28:09.8 |
HIP 4387 |
22.91 |
| 2026-05-23 00:00 |
00:57:41.18 |
+15:28:48.2 |
HIP 4387 |
23.62 |
| 2026-05-23 12:00 |
00:57:45.92 |
+15:29:26.4 |
HIP 4387 |
24.39 |
| 2026-05-24 00:00 |
00:57:50.63 |
+15:30:04.6 |
HIP 4387 |
25.18 |
| 2026-05-24 12:00 |
00:57:55.31 |
+15:30:42.6 |
HIP 4387 |
26.01 |
| 2026-05-25 00:00 |
00:57:59.94 |
+15:31:20.4 |
HIP 4387 |
26.87 |
| 2026-05-25 12:00 |
00:58:04.54 |
+15:31:58.2 |
HIP 4387 |
27.76 |
| 2026-05-26 00:00 |
00:58:09.10 |
+15:32:35.7 |
HIP 4666 |
28.38 |
| 2026-05-26 12:00 |
00:58:13.62 |
+15:33:13.2 |
HIP 4666 |
27.14 |
| 2026-05-27 00:00 |
00:58:18.10 |
+15:33:50.5 |
HIP 4666 |
25.90 |
| 2026-05-27 12:00 |
00:58:22.54 |
+15:34:27.6 |
HIP 4666 |
24.67 |
| 2026-05-28 00:00 |
00:58:26.94 |
+15:35:04.6 |
HIP 4666 |
23.45 |
| 2026-05-28 12:00 |
00:58:31.30 |
+15:35:41.4 |
HIP 4666 |
22.25 |
| 2026-05-29 00:00 |
00:58:35.63 |
+15:36:18.1 |
HIP 4666 |
21.05 |
| 2026-05-29 12:00 |
00:58:39.91 |
+15:36:54.6 |
HIP 4666 |
19.87 |
| 2026-05-30 00:00 |
00:58:44.15 |
+15:37:31.0 |
HIP 4666 |
18.70 |
| 2026-05-30 12:00 |
00:58:48.35 |
+15:38:07.2 |
HIP 4666 |
17.54 |
| 2026-05-31 00:00 |
00:58:52.51 |
+15:38:43.2 |
HIP 4666 |
16.39 |
| 2026-05-31 12:00 |
00:58:56.63 |
+15:39:19.1 |
HIP 4666 |
15.26 |
| 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 |