285P/LINEAR
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 285P/LINEAR |
| Type | P |
| Perihelion (tp_cal, UTC) | 2023-01-12T20:28:47.072640Z |
| Orbit solution date (soln_date, UTC) | 2024-06-06T23:12:48Z |
| Obs used | 933 |
| NEO | - |
| M1 | 13.600 |
| K1 | 4.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-02-29.0000000 |
| e | 0.61787770 |
| q (au) | 1.723017 |
| a (au) | 4.509072 |
| i (deg) | 25.023386 |
| Ω (om, deg) | 185.483345 |
| ω (w, deg) | 178.401291 |
| M (ma, deg) | 252.033734 |
等級
散乱 + 全体線形
$$ M_a = (15.549 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.549 |
| n | 2.000 |
| gf | 1.000 |
| gb | -1.000 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2022-06-28 | 2022-08-13 | +85.0046 | -30.978 |
| 2022-08-13 | 2023-01-09 | -1.4071 | +0.571 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 10:44:37.60 | -02:43:38.3 | HIP 52543 | 15.20 |
| 2026-03-26 12:00 | 10:44:25.55 | -02:41:30.1 | HIP 52543 | 13.23 |
| 2026-03-27 00:00 | 10:44:13.59 | -02:39:22.2 | HIP 52543 | 12.08 |
| 2026-03-27 12:00 | 10:44:01.73 | -02:37:14.4 | HIP 52543 | 11.97 |
| 2026-03-28 00:00 | 10:43:49.96 | -02:35:06.8 | HIP 52543 | 12.92 |
| 2026-03-28 12:00 | 10:43:38.28 | -02:32:59.4 | HIP 52543 | 14.71 |
| 2026-03-29 00:00 | 10:43:26.69 | -02:30:52.2 | HIP 52543 | 17.06 |
| 2026-03-29 12:00 | 10:43:15.20 | -02:28:45.2 | HIP 52409 | 18.97 |
| 2026-03-30 00:00 | 10:43:03.81 | -02:26:38.5 | HIP 52409 | 16.11 |
| 2026-03-30 12:00 | 10:42:52.52 | -02:24:32.0 | HIP 52409 | 13.58 |
| 2026-03-31 00:00 | 10:42:41.32 | -02:22:25.8 | HIP 52409 | 11.58 |
| 2026-03-31 12:00 | 10:42:30.23 | -02:20:19.9 | HIP 52409 | 10.40 |
| 2026-04-01 00:00 | 10:42:19.24 | -02:18:14.3 | HIP 52409 | 10.30 |
| 2026-04-01 12:00 | 10:42:08.35 | -02:16:09.0 | HIP 52409 | 11.29 |
| 2026-04-02 00:00 | 10:41:57.57 | -02:14:03.9 | HIP 52409 | 13.10 |
| 2026-04-02 12:00 | 10:41:46.89 | -02:11:59.3 | HIP 52409 | 15.43 |
| 2026-04-03 00:00 | 10:41:36.33 | -02:09:54.9 | HIP 52409 | 18.07 |
| 2026-04-03 12:00 | 10:41:25.86 | -02:07:50.9 | HIP 52409 | 20.89 |
| 2026-04-04 00:00 | 10:41:15.51 | -02:05:47.3 | HIP 52316 | 21.43 |
| 2026-04-04 12:00 | 10:41:05.27 | -02:03:44.0 | HIP 52316 | 19.84 |
| 2026-04-05 00:00 | 10:40:55.14 | -02:01:41.2 | HIP 52316 | 18.69 |
| 2026-04-05 12:00 | 10:40:45.12 | -01:59:38.7 | HIP 52316 | 18.05 |
| 2026-04-06 00:00 | 10:40:35.22 | -01:57:36.6 | HIP 52316 | 17.97 |
| 2026-04-06 12:00 | 10:40:25.43 | -01:55:35.0 | HIP 52316 | 18.43 |
| 2026-04-07 00:00 | 10:40:15.75 | -01:53:33.8 | HIP 52316 | 19.38 |
| 2026-04-07 12:00 | 10:40:06.19 | -01:51:33.0 | HIP 52316 | 20.75 |
| 2026-04-08 00:00 | 10:39:56.75 | -01:49:32.7 | HIP 52316 | 22.45 |
| 2026-04-08 12:00 | 10:39:47.43 | -01:47:32.9 | HIP 52080 | 24.37 |
| 2026-04-09 00:00 | 10:39:38.23 | -01:45:33.5 | HIP 52080 | 24.05 |
| 2026-04-09 12:00 | 10:39:29.15 | -01:43:34.6 | HIP 52080 | 24.12 |
| 2026-04-10 00:00 | 10:39:20.19 | -01:41:36.3 | HIP 52080 | 24.57 |
| 2026-04-10 12:00 | 10:39:11.35 | -01:39:38.4 | HIP 52080 | 25.37 |
| 2026-04-11 00:00 | 10:39:02.63 | -01:37:41.1 | HIP 52080 | 26.48 |
| 2026-04-11 12:00 | 10:38:54.04 | -01:35:44.3 | HIP 52080 | 27.84 |
| 2026-04-12 00:00 | 10:38:45.58 | -01:33:48.0 | HIP 52080 | 29.43 |
| 2026-04-12 12:00 | 10:38:37.24 | -01:31:52.3 | HIP 52080 | 31.19 |
| 2026-04-13 00:00 | 10:38:29.02 | -01:29:57.1 | HIP 52080 | 33.10 |
| 2026-04-13 12:00 | 10:38:20.94 | -01:28:02.6 | HIP 51919 | 34.77 |
| 2026-04-14 00:00 | 10:38:12.98 | -01:26:08.6 | HIP 51919 | 34.19 |
| 2026-04-14 12:00 | 10:38:05.16 | -01:24:15.2 | HIP 51919 | 33.85 |
| 2026-04-15 00:00 | 10:37:57.46 | -01:22:22.4 | HIP 51919 | 33.73 |
| 2026-04-15 12:00 | 10:37:49.89 | -01:20:30.2 | HIP 51919 | 33.85 |
| 2026-04-16 00:00 | 10:37:42.46 | -01:18:38.7 | HIP 51919 | 34.18 |