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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 10:57:00.71 | +00:07:40.7 | HIP 53419 | 20.67 |
| 2026-07-29 12:00 | 10:57:15.74 | +00:06:47.0 | HIP 53419 | 24.43 |
| 2026-07-30 00:00 | 10:57:30.82 | +00:05:52.8 | HIP 53532 | 25.25 |
| 2026-07-30 12:00 | 10:57:45.94 | +00:04:58.1 | HIP 53532 | 25.51 |
| 2026-07-31 00:00 | 10:58:01.11 | +00:04:02.8 | HIP 53532 | 26.35 |
| 2026-07-31 12:00 | 10:58:16.32 | +00:03:07.1 | HIP 53532 | 27.72 |
| 2026-08-01 00:00 | 10:58:31.58 | +00:02:10.8 | HIP 53532 | 29.55 |
| 2026-08-01 12:00 | 10:58:46.89 | +00:01:14.0 | HIP 53532 | 31.76 |
| 2026-08-02 00:00 | 10:59:02.24 | +00:00:16.7 | HIP 53857 | 30.48 |
| 2026-08-02 12:00 | 10:59:17.63 | -00:00:41.1 | HIP 53857 | 26.76 |
| 2026-08-03 00:00 | 10:59:33.06 | -00:01:39.5 | HIP 53857 | 23.11 |
| 2026-08-03 12:00 | 10:59:48.54 | -00:02:38.3 | HIP 53857 | 19.57 |
| 2026-08-04 00:00 | 11:00:04.06 | -00:03:37.6 | HIP 53857 | 16.25 |
| 2026-08-04 12:00 | 11:00:19.63 | -00:04:37.4 | HIP 53857 | 13.30 |
| 2026-08-05 00:00 | 11:00:35.23 | -00:05:37.6 | HIP 53857 | 11.05 |
| 2026-08-05 12:00 | 11:00:50.87 | -00:06:38.4 | HIP 53857 | 9.99 |
| 2026-08-06 00:00 | 11:01:06.56 | -00:07:39.6 | HIP 53857 | 10.51 |
| 2026-08-06 12:00 | 11:01:22.28 | -00:08:41.4 | HIP 53857 | 12.41 |
| 2026-08-07 00:00 | 11:01:38.05 | -00:09:43.5 | HIP 53978 | 14.38 |
| 2026-08-07 12:00 | 11:01:53.85 | -00:10:46.2 | HIP 53978 | 11.10 |
| 2026-08-08 00:00 | 11:02:09.69 | -00:11:49.3 | HIP 53978 | 8.54 |
| 2026-08-08 12:00 | 11:02:25.56 | -00:12:52.9 | HIP 53978 | 7.51 |
| 2026-08-09 00:00 | 11:02:41.48 | -00:13:57.0 | HIP 53978 | 8.58 |
| 2026-08-09 12:00 | 11:02:57.43 | -00:15:01.5 | HIP 53978 | 11.19 |
| 2026-08-10 00:00 | 11:03:13.41 | -00:16:06.4 | HIP 53978 | 14.53 |
| 2026-08-10 12:00 | 11:03:29.43 | -00:17:11.8 | HIP 54049 | 17.24 |
| 2026-08-11 00:00 | 11:03:45.49 | -00:18:17.6 | HIP 54085 | 16.91 |
| 2026-08-11 12:00 | 11:04:01.57 | -00:19:23.9 | HIP 54085 | 17.54 |
| 2026-08-12 00:00 | 11:04:17.70 | -00:20:30.6 | HIP 54085 | 19.09 |
| 2026-08-12 12:00 | 11:04:33.85 | -00:21:37.8 | HIP 54085 | 21.36 |
| 2026-08-13 00:00 | 11:04:50.04 | -00:22:45.3 | HIP 54085 | 24.17 |
| 2026-08-13 12:00 | 11:05:06.25 | -00:23:53.3 | HIP 54272 | 23.00 |
| 2026-08-14 00:00 | 11:05:22.50 | -00:25:01.7 | HIP 54272 | 19.54 |
| 2026-08-14 12:00 | 11:05:38.78 | -00:26:10.5 | HIP 54272 | 16.42 |
| 2026-08-15 00:00 | 11:05:55.08 | -00:27:19.7 | HIP 54272 | 13.90 |
| 2026-08-15 12:00 | 11:06:11.42 | -00:28:29.3 | HIP 54272 | 12.35 |
| 2026-08-16 00:00 | 11:06:27.78 | -00:29:39.3 | HIP 54272 | 12.15 |
| 2026-08-16 12:00 | 11:06:44.17 | -00:30:49.7 | HIP 54272 | 13.38 |
| 2026-08-17 00:00 | 11:07:00.59 | -00:32:00.5 | HIP 54272 | 15.71 |
| 2026-08-17 12:00 | 11:07:17.03 | -00:33:11.6 | HIP 54272 | 18.74 |
| 2026-08-18 00:00 | 11:07:33.50 | -00:34:23.2 | HIP 54464 | 15.51 |
| 2026-08-18 12:00 | 11:07:49.99 | -00:35:35.1 | HIP 54464 | 11.52 |
| 2026-08-19 00:00 | 11:08:06.51 | -00:36:47.4 | HIP 54464 | 7.85 |