C/2021 S3 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2021 S3 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-02-14T17:02:55.976640Z |
| Orbit solution date (soln_date, UTC) | 2026-01-07T15:42:41Z |
| Obs used | 4855 |
| NEO | - |
| M1 | 10.700 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2021-09-24T13:27:42.969600Z |
| Discovery magnitude (MPC) | 20.17 i |
| Discovery observatory (MPC) | F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-03-19.0000000 |
| e | 1.00024544 |
| q (au) | 1.320205 |
| a (au) | -5378.855450 |
| i (deg) | 58.532818 |
| Ω (om, deg) | 215.620806 |
| ω (w, deg) | 6.853898 |
| M (ma, deg) | 0.000083 |
等級
散乱 + 全体線形
$$ M_a = (9.831 + 3.205\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.831 |
| n | 3.205 |
| gf | 0.979 |
| gb | -0.920 |
| k | 0.980 |
| δ90 | 9.677 |
| 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 |
|---|---|---|---|
| 2020-12-06 | 2023-05-02 | +6.9422 | -5.957 |
| 2023-05-02 | 2024-02-14 | -0.4821 | -1.245 |
| 2024-02-14 | 2024-11-13 | +1.5695 | -0.806 |
| 2024-11-13 | 2025-10-03 | +6.3890 | -3.705 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 23:15:51.34 | +30:53:29.4 | HIP 114886 | 14.47 |
| 2026-02-03 12:00 | 23:16:08.06 | +30:53:07.9 | HIP 114886 | 13.10 |
| 2026-02-04 00:00 | 23:16:24.82 | +30:52:47.6 | HIP 114886 | 12.68 |
| 2026-02-04 12:00 | 23:16:41.61 | +30:52:28.4 | HIP 114886 | 13.29 |
| 2026-02-05 00:00 | 23:16:58.44 | +30:52:10.4 | HIP 115018 | 13.45 |
| 2026-02-05 12:00 | 23:17:15.30 | +30:51:53.5 | HIP 115018 | 11.47 |
| 2026-02-06 00:00 | 23:17:32.19 | +30:51:37.8 | HIP 115018 | 10.40 |
| 2026-02-06 12:00 | 23:17:49.11 | +30:51:23.2 | HIP 115018 | 10.52 |
| 2026-02-07 00:00 | 23:18:06.06 | +30:51:09.8 | HIP 115018 | 11.80 |
| 2026-02-07 12:00 | 23:18:23.04 | +30:50:57.5 | HIP 115018 | 13.94 |
| 2026-02-08 00:00 | 23:18:40.06 | +30:50:46.3 | HIP 115018 | 16.60 |
| 2026-02-08 12:00 | 23:18:57.10 | +30:50:36.3 | HIP 115018 | 19.58 |
| 2026-02-09 00:00 | 23:19:14.17 | +30:50:27.3 | HIP 115018 | 22.75 |
| 2026-02-09 12:00 | 23:19:31.26 | +30:50:19.5 | HIP 115018 | 26.05 |
| 2026-02-10 00:00 | 23:19:48.38 | +30:50:12.8 | HIP 115292 | 25.41 |
| 2026-02-10 12:00 | 23:20:05.53 | +30:50:07.2 | HIP 115292 | 23.51 |
| 2026-02-11 00:00 | 23:20:22.71 | +30:50:02.7 | HIP 115292 | 22.03 |
| 2026-02-11 12:00 | 23:20:39.91 | +30:49:59.3 | HIP 115292 | 21.09 |
| 2026-02-12 00:00 | 23:20:57.13 | +30:49:57.0 | HIP 115292 | 20.75 |
| 2026-02-12 12:00 | 23:21:14.37 | +30:49:55.8 | HIP 115292 | 21.04 |
| 2026-02-13 00:00 | 23:21:31.64 | +30:49:55.7 | HIP 115292 | 21.94 |
| 2026-02-13 12:00 | 23:21:48.93 | +30:49:56.7 | HIP 115292 | 23.39 |
| 2026-02-14 00:00 | 23:22:06.24 | +30:49:58.7 | HIP 115292 | 25.29 |
| 2026-02-14 12:00 | 23:22:23.57 | +30:50:01.8 | HIP 115545 | 25.01 |
| 2026-02-15 00:00 | 23:22:40.92 | +30:50:06.0 | HIP 115545 | 21.39 |
| 2026-02-15 12:00 | 23:22:58.29 | +30:50:11.2 | HIP 115545 | 17.81 |
| 2026-02-16 00:00 | 23:23:15.68 | +30:50:17.5 | HIP 115545 | 14.31 |
| 2026-02-16 12:00 | 23:23:33.09 | +30:50:24.8 | HIP 115545 | 10.97 |
| 2026-02-17 00:00 | 23:23:50.51 | +30:50:33.1 | HIP 115545 | 8.00 |
| 2026-02-17 12:00 | 23:24:07.95 | +30:50:42.6 | HIP 115545 | 6.00 |
| 2026-02-18 00:00 | 23:24:25.40 | +30:50:53.0 | HIP 115545 | 6.02 |
| 2026-02-18 12:00 | 23:24:42.87 | +30:51:04.5 | HIP 115545 | 8.06 |
| 2026-02-19 00:00 | 23:25:00.35 | +30:51:17.0 | HIP 115563 | 10.64 |
| 2026-02-19 12:00 | 23:25:17.84 | +30:51:30.5 | HIP 115634 | 11.97 |
| 2026-02-20 00:00 | 23:25:35.35 | +30:51:45.0 | HIP 115634 | 11.52 |
| 2026-02-20 12:00 | 23:25:52.87 | +30:52:00.5 | HIP 115634 | 12.25 |
| 2026-02-21 00:00 | 23:26:10.40 | +30:52:17.0 | HIP 115634 | 13.98 |
| 2026-02-21 12:00 | 23:26:27.93 | +30:52:34.5 | HIP 115634 | 16.40 |
| 2026-02-22 00:00 | 23:26:45.48 | +30:52:53.0 | HIP 115634 | 19.25 |
| 2026-02-22 12:00 | 23:27:03.04 | +30:53:12.5 | HIP 115634 | 22.37 |
| 2026-02-23 00:00 | 23:27:20.60 | +30:53:32.9 | HIP 115634 | 25.66 |
| 2026-02-23 12:00 | 23:27:38.17 | +30:53:54.4 | HIP 115634 | 29.07 |
| 2026-02-24 00:00 | 23:27:55.75 | +30:54:16.7 | HIP 116016 | 32.52 |