C/2020 S3 (Erasmus)
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 | 2020-12-25 | +19.9822 | +6.287 |
| 2020-12-25 | 2020-12-29 | -14.5821 | -3.580 |
| 2020-12-29 | 2021-07-09 | -1.0962 | -0.447 |
| 2021-07-09 | 2021-09-12 | +17.9826 | -10.980 |
| 2021-09-12 | 2021-11-27 | -10.7780 | +6.819 |
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 | 00:35:45.87 | +13:27:05.0 | HIP 2734 | 13.18 |
| 2026-02-03 12:00 | 00:35:50.17 | +13:27:14.9 | HIP 2734 | 14.21 |
| 2026-02-04 00:00 | 00:35:54.51 | +13:27:25.1 | HIP 2885 | 14.50 |
| 2026-02-04 12:00 | 00:35:58.90 | +13:27:35.6 | HIP 2885 | 13.97 |
| 2026-02-05 00:00 | 00:36:03.33 | +13:27:46.6 | HIP 2885 | 13.51 |
| 2026-02-05 12:00 | 00:36:07.80 | +13:27:57.9 | HIP 2885 | 13.13 |
| 2026-02-06 00:00 | 00:36:12.32 | +13:28:09.5 | HIP 2885 | 12.83 |
| 2026-02-06 12:00 | 00:36:16.88 | +13:28:21.6 | HIP 2885 | 12.62 |
| 2026-02-07 00:00 | 00:36:21.48 | +13:28:34.0 | HIP 2885 | 12.52 |
| 2026-02-07 12:00 | 00:36:26.12 | +13:28:46.7 | HIP 2885 | 12.52 |
| 2026-02-08 00:00 | 00:36:30.80 | +13:28:59.9 | HIP 2885 | 12.64 |
| 2026-02-08 12:00 | 00:36:35.52 | +13:29:13.3 | HIP 2885 | 12.86 |
| 2026-02-09 00:00 | 00:36:40.28 | +13:29:27.2 | HIP 2885 | 13.19 |
| 2026-02-09 12:00 | 00:36:45.08 | +13:29:41.4 | HIP 2885 | 13.63 |
| 2026-02-10 00:00 | 00:36:49.93 | +13:29:55.9 | HIP 2885 | 14.16 |
| 2026-02-10 12:00 | 00:36:54.81 | +13:30:10.8 | HIP 2885 | 14.78 |
| 2026-02-11 00:00 | 00:36:59.73 | +13:30:26.0 | HIP 2885 | 15.48 |
| 2026-02-11 12:00 | 00:37:04.68 | +13:30:41.6 | HIP 2885 | 16.25 |
| 2026-02-12 00:00 | 00:37:09.68 | +13:30:57.6 | HIP 2885 | 17.08 |
| 2026-02-12 12:00 | 00:37:14.71 | +13:31:13.9 | HIP 2885 | 17.97 |
| 2026-02-13 00:00 | 00:37:19.79 | +13:31:30.5 | HIP 2885 | 18.92 |
| 2026-02-13 12:00 | 00:37:24.89 | +13:31:47.5 | HIP 2885 | 19.90 |
| 2026-02-14 00:00 | 00:37:30.04 | +13:32:04.8 | HIP 2885 | 20.93 |
| 2026-02-14 12:00 | 00:37:35.22 | +13:32:22.5 | HIP 2885 | 22.00 |
| 2026-02-15 00:00 | 00:37:40.44 | +13:32:40.5 | HIP 2885 | 23.10 |
| 2026-02-15 12:00 | 00:37:45.69 | +13:32:58.8 | HIP 2885 | 24.23 |
| 2026-02-16 00:00 | 00:37:50.98 | +13:33:17.4 | HIP 2885 | 25.39 |
| 2026-02-16 12:00 | 00:37:56.30 | +13:33:36.4 | HIP 2885 | 26.57 |
| 2026-02-17 00:00 | 00:38:01.66 | +13:33:55.8 | HIP 2885 | 27.78 |
| 2026-02-17 12:00 | 00:38:07.05 | +13:34:15.4 | HIP 2885 | 29.01 |
| 2026-02-18 00:00 | 00:38:12.48 | +13:34:35.4 | HIP 2885 | 30.25 |
| 2026-02-18 12:00 | 00:38:17.93 | +13:34:55.7 | HIP 3107 | 29.97 |
| 2026-02-19 00:00 | 00:38:23.42 | +13:35:16.3 | HIP 3107 | 28.89 |
| 2026-02-19 12:00 | 00:38:28.95 | +13:35:37.2 | HIP 3107 | 27.82 |
| 2026-02-20 00:00 | 00:38:34.50 | +13:35:58.5 | HIP 3107 | 26.78 |
| 2026-02-20 12:00 | 00:38:40.09 | +13:36:20.0 | HIP 3107 | 25.76 |
| 2026-02-21 00:00 | 00:38:45.70 | +13:36:41.9 | HIP 3107 | 24.78 |
| 2026-02-21 12:00 | 00:38:51.35 | +13:37:04.1 | HIP 3107 | 23.83 |
| 2026-02-22 00:00 | 00:38:57.03 | +13:37:26.6 | HIP 3107 | 22.91 |
| 2026-02-22 12:00 | 00:39:02.74 | +13:37:49.4 | HIP 3107 | 22.05 |
| 2026-02-23 00:00 | 00:39:08.47 | +13:38:12.5 | HIP 3107 | 21.24 |
| 2026-02-23 12:00 | 00:39:14.24 | +13:38:35.9 | HIP 3107 | 20.50 |
| 2026-02-24 00:00 | 00:39:20.03 | +13:38:59.6 | HIP 3107 | 19.83 |