C/1942 X1 (Whipple-Fedtke-Tevzadze)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1942 X1 (Whipple-Fedtke-Tevzadze) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1943-02-06T17:18:23.040000Z |
| Orbit solution date (soln_date, UTC) | - |
| Obs used | 166 |
| NEO | - |
| M1 | - |
| K1 | - |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1943-02-05.0000000 |
| e | 0.99219600 |
| q (au) | 1.353647 |
| a (au) | 173.455536 |
| i (deg) | 19.712700 |
| Ω (om, deg) | 100.799000 |
| ω (w, deg) | 39.843200 |
| M (ma, deg) | -0.000743 |
等級
散乱 + 全体線形
$$ M_a = (3.857 + 3.863\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 3.857 |
| n | 3.863 |
| gf | 1.000 |
| gb | -0.500 |
| 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 |
|---|---|---|---|
| 1942-12-15 | 1943-02-06 | +38.1961 | -4.915 |
| 1943-02-06 | 1943-04-13 | +2.8278 | -0.764 |
| 1943-04-13 | 1943-06-05 | -2.7997 | +0.823 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 20:52:38.13 | -27:18:09.0 | HIP 102954 | 14.75 |
| 2026-07-29 12:00 | 20:52:36.87 | -27:18:14.1 | HIP 102954 | 14.50 |
| 2026-07-30 00:00 | 20:52:35.60 | -27:18:19.0 | HIP 102954 | 14.25 |
| 2026-07-30 12:00 | 20:52:34.34 | -27:18:24.0 | HIP 102954 | 14.00 |
| 2026-07-31 00:00 | 20:52:33.07 | -27:18:29.0 | HIP 102954 | 13.75 |
| 2026-07-31 12:00 | 20:52:31.80 | -27:18:33.9 | HIP 102954 | 13.50 |
| 2026-08-01 00:00 | 20:52:30.54 | -27:18:38.8 | HIP 102954 | 13.26 |
| 2026-08-01 12:00 | 20:52:29.27 | -27:18:43.7 | HIP 102954 | 13.01 |
| 2026-08-02 00:00 | 20:52:28.00 | -27:18:48.5 | HIP 102954 | 12.77 |
| 2026-08-02 12:00 | 20:52:26.73 | -27:18:53.4 | HIP 102954 | 12.53 |
| 2026-08-03 00:00 | 20:52:25.46 | -27:18:58.2 | HIP 102954 | 12.29 |
| 2026-08-03 12:00 | 20:52:24.20 | -27:19:02.9 | HIP 102954 | 12.06 |
| 2026-08-04 00:00 | 20:52:22.93 | -27:19:07.7 | HIP 102954 | 11.82 |
| 2026-08-04 12:00 | 20:52:21.66 | -27:19:12.4 | HIP 102954 | 11.59 |
| 2026-08-05 00:00 | 20:52:20.39 | -27:19:17.1 | HIP 102954 | 11.37 |
| 2026-08-05 12:00 | 20:52:19.12 | -27:19:21.8 | HIP 102954 | 11.14 |
| 2026-08-06 00:00 | 20:52:17.85 | -27:19:26.4 | HIP 102954 | 10.92 |
| 2026-08-06 12:00 | 20:52:16.59 | -27:19:31.0 | HIP 102954 | 10.70 |
| 2026-08-07 00:00 | 20:52:15.32 | -27:19:35.6 | HIP 102954 | 10.49 |
| 2026-08-07 12:00 | 20:52:14.05 | -27:19:40.1 | HIP 102954 | 10.28 |
| 2026-08-08 00:00 | 20:52:12.79 | -27:19:44.7 | HIP 102954 | 10.07 |
| 2026-08-08 12:00 | 20:52:11.52 | -27:19:49.2 | HIP 102954 | 9.87 |
| 2026-08-09 00:00 | 20:52:10.26 | -27:19:53.6 | HIP 102954 | 9.67 |
| 2026-08-09 12:00 | 20:52:09.00 | -27:19:58.1 | HIP 102954 | 9.47 |
| 2026-08-10 00:00 | 20:52:07.74 | -27:20:02.5 | HIP 102954 | 9.28 |
| 2026-08-10 12:00 | 20:52:06.48 | -27:20:06.8 | HIP 102954 | 9.10 |
| 2026-08-11 00:00 | 20:52:05.22 | -27:20:11.2 | HIP 102954 | 8.92 |
| 2026-08-11 12:00 | 20:52:03.96 | -27:20:15.5 | HIP 102954 | 8.75 |
| 2026-08-12 00:00 | 20:52:02.70 | -27:20:19.8 | HIP 102954 | 8.58 |
| 2026-08-12 12:00 | 20:52:01.45 | -27:20:24.0 | HIP 102954 | 8.42 |
| 2026-08-13 00:00 | 20:52:00.20 | -27:20:28.2 | HIP 102954 | 8.27 |
| 2026-08-13 12:00 | 20:51:58.95 | -27:20:32.4 | HIP 102954 | 8.12 |
| 2026-08-14 00:00 | 20:51:57.70 | -27:20:36.6 | HIP 102954 | 7.99 |
| 2026-08-14 12:00 | 20:51:56.45 | -27:20:40.7 | HIP 102954 | 7.85 |
| 2026-08-15 00:00 | 20:51:55.21 | -27:20:44.8 | HIP 102954 | 7.73 |
| 2026-08-15 12:00 | 20:51:53.96 | -27:20:48.8 | HIP 102954 | 7.62 |
| 2026-08-16 00:00 | 20:51:52.72 | -27:20:52.8 | HIP 102954 | 7.51 |
| 2026-08-16 12:00 | 20:51:51.49 | -27:20:56.8 | HIP 102954 | 7.42 |
| 2026-08-17 00:00 | 20:51:50.25 | -27:21:00.7 | HIP 102954 | 7.33 |
| 2026-08-17 12:00 | 20:51:49.02 | -27:21:04.6 | HIP 102954 | 7.25 |
| 2026-08-18 00:00 | 20:51:47.79 | -27:21:08.5 | HIP 102954 | 7.19 |
| 2026-08-18 12:00 | 20:51:46.56 | -27:21:12.3 | HIP 102954 | 7.13 |
| 2026-08-19 00:00 | 20:51:45.34 | -27:21:16.1 | HIP 102954 | 7.08 |