152P/Helin-Lawrence
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 152P/Helin-Lawrence |
| Type | P |
| Perihelion (tp_cal, UTC) | 2012-07-08T08:45:15.160320Z |
| Orbit solution date (soln_date, UTC) | 2025-03-06T13:42:28Z |
| Obs used | 1298 |
| NEO | - |
| M1 | 12.700 |
| K1 | 6.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-02-09.0000000 |
| e | 0.30721897 |
| q (au) | 3.112792 |
| a (au) | 4.493183 |
| i (deg) | 9.868309 |
| Ω (om, deg) | 91.899208 |
| ω (w, deg) | 163.585758 |
| M (ma, deg) | 97.858042 |
等級
散乱 + 全体線形
$$ M_a = (12.595 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.595 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.873 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2020-02-20 | 2022-01-12 | +17.5656 | -9.164 |
| 2022-01-12 | 2023-08-23 | -11.7992 | +7.162 |
| 2023-08-23 | 2025-01-04 | +22.4248 | -14.516 |
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 | 05:14:12.01 | +19:58:50.0 | HIP 24480 | 14.71 |
| 2026-07-29 12:00 | 05:14:31.43 | +19:59:17.1 | HIP 24480 | 10.28 |
| 2026-07-30 00:00 | 05:14:50.76 | +19:59:43.9 | HIP 24480 | 6.09 |
| 2026-07-30 12:00 | 05:15:10.01 | +20:00:10.4 | HIP 24480 | 3.22 |
| 2026-07-31 00:00 | 05:15:29.19 | +20:00:36.5 | HIP 24480 | 4.98 |
| 2026-07-31 12:00 | 05:15:48.28 | +20:01:02.5 | HIP 24535 | 3.83 |
| 2026-08-01 00:00 | 05:16:07.28 | +20:01:28.1 | HIP 24535 | 5.83 |
| 2026-08-01 12:00 | 05:16:26.21 | +20:01:53.4 | HIP 24619 | 7.53 |
| 2026-08-02 00:00 | 05:16:45.05 | +20:02:18.4 | HIP 24619 | 4.90 |
| 2026-08-02 12:00 | 05:17:03.80 | +20:02:43.2 | HIP 24619 | 5.54 |
| 2026-08-03 00:00 | 05:17:22.47 | +20:03:07.7 | HIP 24663 | 5.21 |
| 2026-08-03 12:00 | 05:17:41.06 | +20:03:31.9 | HIP 24663 | 4.97 |
| 2026-08-04 00:00 | 05:17:59.55 | +20:03:55.8 | HIP 24663 | 7.77 |
| 2026-08-04 12:00 | 05:18:17.96 | +20:04:19.4 | HIP 24663 | 11.56 |
| 2026-08-05 00:00 | 05:18:36.28 | +20:04:42.8 | HIP 24820 | 9.63 |
| 2026-08-05 12:00 | 05:18:54.51 | +20:05:05.9 | HIP 24820 | 5.60 |
| 2026-08-06 00:00 | 05:19:12.64 | +20:05:28.7 | HIP 24820 | 2.65 |
| 2026-08-06 12:00 | 05:19:30.69 | +20:05:51.2 | HIP 24820 | 4.36 |
| 2026-08-07 00:00 | 05:19:48.64 | +20:06:13.4 | HIP 24820 | 8.18 |
| 2026-08-07 12:00 | 05:20:06.50 | +20:06:35.4 | HIP 24835 | 11.49 |
| 2026-08-08 00:00 | 05:20:24.26 | +20:06:57.2 | HIP 24835 | 14.96 |
| 2026-08-08 12:00 | 05:20:41.93 | +20:07:18.6 | HIP 24835 | 18.70 |
| 2026-08-09 00:00 | 05:20:59.50 | +20:07:39.8 | HIP 24977 | 18.81 |
| 2026-08-09 12:00 | 05:21:16.98 | +20:08:00.7 | HIP 24977 | 19.74 |
| 2026-08-10 00:00 | 05:21:34.35 | +20:08:21.4 | HIP 25086 | 20.60 |
| 2026-08-10 12:00 | 05:21:51.63 | +20:08:41.7 | HIP 25086 | 19.41 |
| 2026-08-11 00:00 | 05:22:08.81 | +20:09:01.9 | HIP 25086 | 19.03 |
| 2026-08-11 12:00 | 05:22:25.88 | +20:09:21.8 | HIP 25086 | 19.49 |
| 2026-08-12 00:00 | 05:22:42.85 | +20:09:41.4 | HIP 25250 | 19.96 |
| 2026-08-12 12:00 | 05:22:59.72 | +20:10:00.7 | HIP 25250 | 16.80 |
| 2026-08-13 00:00 | 05:23:16.49 | +20:10:19.9 | HIP 25268 | 14.02 |
| 2026-08-13 12:00 | 05:23:33.15 | +20:10:38.7 | HIP 25268 | 10.22 |
| 2026-08-14 00:00 | 05:23:49.70 | +20:10:57.3 | HIP 25268 | 6.60 |
| 2026-08-14 12:00 | 05:24:06.15 | +20:11:15.7 | HIP 25268 | 3.62 |
| 2026-08-15 00:00 | 05:24:22.49 | +20:11:33.9 | HIP 25268 | 3.54 |
| 2026-08-15 12:00 | 05:24:38.72 | +20:11:51.7 | HIP 25268 | 6.42 |
| 2026-08-16 00:00 | 05:24:54.84 | +20:12:09.4 | HIP 25268 | 9.93 |
| 2026-08-16 12:00 | 05:25:10.85 | +20:12:26.8 | HIP 25268 | 13.57 |
| 2026-08-17 00:00 | 05:25:26.75 | +20:12:44.0 | HIP 25268 | 17.23 |
| 2026-08-17 12:00 | 05:25:42.53 | +20:13:00.9 | HIP 25268 | 20.90 |
| 2026-08-18 00:00 | 05:25:58.21 | +20:13:17.6 | HIP 25510 | 23.03 |
| 2026-08-18 12:00 | 05:26:13.77 | +20:13:34.1 | HIP 25510 | 20.37 |
| 2026-08-19 00:00 | 05:26:29.21 | +20:13:50.4 | HIP 25510 | 18.09 |