C/1937 D1 (Wilk)
メタデータ
| 項目 |
値 |
| Designation |
C/1937 D1 (Wilk) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1937-02-21T12:38:22.404480Z |
| Orbit solution date (soln_date, UTC) |
2024-02-20T20:16:49Z |
| Obs used |
17 |
| NEO |
Yes |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1937-03-17.0000000 |
| e |
0.98064326 |
| q (au) |
0.618890 |
| a (au) |
31.972825 |
| i (deg) |
26.014023 |
| Ω (om, deg) |
58.270037 |
| ω (w, deg) |
31.457951 |
| M (ma, deg) |
0.127970 |
等級
散乱 + 全体線形
$$
M_a = (10.016 + 4.637\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.016 |
| n |
4.637 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.940 |
| δ90 |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:48:33.35 |
-36:27:16.5 |
HIP 87218 |
8.09 |
| 2026-02-03 12:00 |
17:48:35.00 |
-36:27:21.6 |
HIP 87218 |
7.76 |
| 2026-02-04 00:00 |
17:48:36.64 |
-36:27:26.8 |
HIP 87218 |
7.44 |
| 2026-02-04 12:00 |
17:48:38.26 |
-36:27:32.1 |
HIP 87218 |
7.11 |
| 2026-02-05 00:00 |
17:48:39.87 |
-36:27:37.3 |
HIP 87218 |
6.80 |
| 2026-02-05 12:00 |
17:48:41.46 |
-36:27:42.6 |
HIP 87218 |
6.48 |
| 2026-02-06 00:00 |
17:48:43.04 |
-36:27:47.9 |
HIP 87218 |
6.17 |
| 2026-02-06 12:00 |
17:48:44.61 |
-36:27:53.3 |
HIP 87218 |
5.86 |
| 2026-02-07 00:00 |
17:48:46.16 |
-36:27:58.7 |
HIP 87218 |
5.56 |
| 2026-02-07 12:00 |
17:48:47.69 |
-36:28:04.1 |
HIP 87218 |
5.26 |
| 2026-02-08 00:00 |
17:48:49.21 |
-36:28:09.6 |
HIP 87218 |
4.97 |
| 2026-02-08 12:00 |
17:48:50.71 |
-36:28:15.1 |
HIP 87218 |
4.68 |
| 2026-02-09 00:00 |
17:48:52.20 |
-36:28:20.6 |
HIP 87218 |
4.40 |
| 2026-02-09 12:00 |
17:48:53.67 |
-36:28:26.1 |
HIP 87218 |
4.13 |
| 2026-02-10 00:00 |
17:48:55.13 |
-36:28:31.7 |
HIP 87218 |
3.86 |
| 2026-02-10 12:00 |
17:48:56.57 |
-36:28:37.3 |
HIP 87218 |
3.60 |
| 2026-02-11 00:00 |
17:48:57.99 |
-36:28:42.9 |
HIP 87218 |
3.35 |
| 2026-02-11 12:00 |
17:48:59.40 |
-36:28:48.6 |
HIP 87218 |
3.11 |
| 2026-02-12 00:00 |
17:49:00.79 |
-36:28:54.3 |
HIP 87218 |
2.88 |
| 2026-02-12 12:00 |
17:49:02.17 |
-36:29:00.0 |
HIP 87218 |
2.67 |
| 2026-02-13 00:00 |
17:49:03.53 |
-36:29:05.8 |
HIP 87218 |
2.47 |
| 2026-02-13 12:00 |
17:49:04.87 |
-36:29:11.5 |
HIP 87218 |
2.29 |
| 2026-02-14 00:00 |
17:49:06.19 |
-36:29:17.3 |
HIP 87218 |
2.14 |
| 2026-02-14 12:00 |
17:49:07.50 |
-36:29:23.2 |
HIP 87218 |
2.01 |
| 2026-02-15 00:00 |
17:49:08.79 |
-36:29:29.0 |
HIP 87218 |
1.92 |
| 2026-02-15 12:00 |
17:49:10.07 |
-36:29:34.9 |
HIP 87218 |
1.86 |
| 2026-02-16 00:00 |
17:49:11.33 |
-36:29:40.8 |
HIP 87218 |
1.84 |
| 2026-02-16 12:00 |
17:49:12.57 |
-36:29:46.7 |
HIP 87218 |
1.86 |
| 2026-02-17 00:00 |
17:49:13.79 |
-36:29:52.7 |
HIP 87218 |
1.91 |
| 2026-02-17 12:00 |
17:49:14.99 |
-36:29:58.7 |
HIP 87218 |
2.00 |
| 2026-02-18 00:00 |
17:49:16.18 |
-36:30:04.7 |
HIP 87218 |
2.11 |
| 2026-02-18 12:00 |
17:49:17.35 |
-36:30:10.7 |
HIP 87218 |
2.24 |
| 2026-02-19 00:00 |
17:49:18.50 |
-36:30:16.8 |
HIP 87218 |
2.39 |
| 2026-02-19 12:00 |
17:49:19.64 |
-36:30:22.8 |
HIP 87218 |
2.55 |
| 2026-02-20 00:00 |
17:49:20.75 |
-36:30:28.9 |
HIP 87218 |
2.72 |
| 2026-02-20 12:00 |
17:49:21.85 |
-36:30:35.1 |
HIP 87218 |
2.90 |
| 2026-02-21 00:00 |
17:49:22.93 |
-36:30:41.2 |
HIP 87218 |
3.09 |
| 2026-02-21 12:00 |
17:49:24.00 |
-36:30:47.4 |
HIP 87218 |
3.27 |
| 2026-02-22 00:00 |
17:49:25.04 |
-36:30:53.5 |
HIP 87218 |
3.46 |
| 2026-02-22 12:00 |
17:49:26.07 |
-36:30:59.7 |
HIP 87218 |
3.65 |
| 2026-02-23 00:00 |
17:49:27.07 |
-36:31:06.0 |
HIP 87218 |
3.85 |
| 2026-02-23 12:00 |
17:49:28.06 |
-36:31:12.2 |
HIP 87218 |
4.04 |
| 2026-02-24 00:00 |
17:49:29.03 |
-36:31:18.5 |
HIP 87218 |
4.23 |