29P/Schwassmann-Wachmann 1
メタデータ
| 項目 |
値 |
| Designation |
29P/Schwassmann-Wachmann 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-04-16T10:13:18.243840Z |
| Orbit solution date (soln_date, UTC) |
2025-04-14T15:28:00Z |
| Obs used |
739 |
| NEO |
- |
| M1 |
10.100 |
| 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) |
2022-10-14.0000000 |
| e |
0.04479814 |
| q (au) |
5.775128 |
| a (au) |
6.045977 |
| i (deg) |
9.364771 |
| Ω (om, deg) |
312.390917 |
| ω (w, deg) |
50.662700 |
| M (ma, deg) |
84.635081 |
等級
散乱 + 全体線形
$$
M_a = (10.695 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.695 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.687 |
| k |
0.800 |
| δ90 |
9.997 |
| 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
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) |
| 2026-02-03 00:00 |
11:30:12.51 |
-03:42:21.3 |
HIP 56006 |
30.57 |
| 2026-02-03 12:00 |
11:30:04.01 |
-03:42:08.4 |
HIP 56006 |
28.83 |
| 2026-02-04 00:00 |
11:29:55.39 |
-03:41:54.5 |
HIP 56006 |
27.12 |
| 2026-02-04 12:00 |
11:29:46.65 |
-03:41:39.6 |
HIP 56006 |
25.45 |
| 2026-02-05 00:00 |
11:29:37.78 |
-03:41:23.8 |
HIP 56006 |
23.83 |
| 2026-02-05 12:00 |
11:29:28.80 |
-03:41:07.0 |
HIP 56006 |
22.28 |
| 2026-02-06 00:00 |
11:29:19.70 |
-03:40:49.3 |
HIP 56006 |
20.84 |
| 2026-02-06 12:00 |
11:29:10.48 |
-03:40:30.6 |
HIP 56006 |
19.53 |
| 2026-02-07 00:00 |
11:29:01.15 |
-03:40:10.9 |
HIP 56006 |
18.40 |
| 2026-02-07 12:00 |
11:28:51.71 |
-03:39:50.3 |
HIP 56006 |
17.49 |
| 2026-02-08 00:00 |
11:28:42.15 |
-03:39:28.8 |
HIP 56006 |
16.86 |
| 2026-02-08 12:00 |
11:28:32.48 |
-03:39:06.3 |
HIP 56006 |
16.54 |
| 2026-02-09 00:00 |
11:28:22.70 |
-03:38:42.8 |
HIP 56006 |
16.58 |
| 2026-02-09 12:00 |
11:28:12.81 |
-03:38:18.5 |
HIP 56006 |
16.97 |
| 2026-02-10 00:00 |
11:28:02.82 |
-03:37:53.2 |
HIP 56006 |
17.71 |
| 2026-02-10 12:00 |
11:27:52.72 |
-03:37:27.0 |
HIP 56006 |
18.77 |
| 2026-02-11 00:00 |
11:27:42.51 |
-03:36:59.8 |
HIP 56006 |
20.10 |
| 2026-02-11 12:00 |
11:27:32.21 |
-03:36:31.8 |
HIP 56006 |
21.68 |
| 2026-02-12 00:00 |
11:27:21.80 |
-03:36:02.8 |
HIP 56006 |
23.45 |
| 2026-02-12 12:00 |
11:27:11.29 |
-03:35:33.0 |
HIP 56006 |
25.39 |
| 2026-02-13 00:00 |
11:27:00.68 |
-03:35:02.2 |
HIP 56006 |
27.47 |
| 2026-02-13 12:00 |
11:26:49.97 |
-03:34:30.6 |
HIP 56006 |
29.66 |
| 2026-02-14 00:00 |
11:26:39.17 |
-03:33:58.0 |
HIP 56006 |
31.95 |
| 2026-02-14 12:00 |
11:26:28.28 |
-03:33:24.6 |
HIP 56006 |
34.33 |
| 2026-02-15 00:00 |
11:26:17.29 |
-03:32:50.4 |
HIP 56006 |
36.78 |
| 2026-02-15 12:00 |
11:26:06.21 |
-03:32:15.2 |
HIP 56006 |
39.30 |
| 2026-02-16 00:00 |
11:25:55.05 |
-03:31:39.2 |
HIP 55609 |
37.82 |
| 2026-02-16 12:00 |
11:25:43.80 |
-03:31:02.4 |
HIP 55609 |
35.00 |
| 2026-02-17 00:00 |
11:25:32.46 |
-03:30:24.7 |
HIP 55609 |
32.15 |
| 2026-02-17 12:00 |
11:25:21.04 |
-03:29:46.2 |
HIP 55609 |
29.29 |
| 2026-02-18 00:00 |
11:25:09.54 |
-03:29:06.9 |
HIP 55609 |
26.42 |
| 2026-02-18 12:00 |
11:24:57.96 |
-03:28:26.8 |
HIP 55609 |
23.55 |
| 2026-02-19 00:00 |
11:24:46.30 |
-03:27:45.8 |
HIP 55609 |
20.67 |
| 2026-02-19 12:00 |
11:24:34.56 |
-03:27:04.1 |
HIP 55609 |
17.81 |
| 2026-02-20 00:00 |
11:24:22.75 |
-03:26:21.6 |
HIP 55609 |
14.99 |
| 2026-02-20 12:00 |
11:24:10.87 |
-03:25:38.3 |
HIP 55609 |
12.25 |
| 2026-02-21 00:00 |
11:23:58.92 |
-03:24:54.2 |
HIP 55609 |
9.67 |
| 2026-02-21 12:00 |
11:23:46.91 |
-03:24:09.4 |
HIP 55609 |
7.45 |
| 2026-02-22 00:00 |
11:23:34.82 |
-03:23:23.8 |
HIP 55609 |
6.04 |
| 2026-02-22 12:00 |
11:23:22.67 |
-03:22:37.5 |
HIP 55609 |
6.07 |
| 2026-02-23 00:00 |
11:23:10.46 |
-03:21:50.5 |
HIP 55609 |
7.54 |
| 2026-02-23 12:00 |
11:22:58.19 |
-03:21:02.8 |
HIP 55609 |
9.84 |
| 2026-02-24 00:00 |
11:22:45.87 |
-03:20:14.3 |
HIP 55609 |
12.53 |