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
$$
M_a = (11.181 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.181 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.738 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-05-12 00:00 |
10:59:01.68 |
-00:56:16.2 |
HIP 53865 |
32.99 |
| 2026-05-12 12:00 |
10:59:01.14 |
-00:55:55.4 |
HIP 53865 |
33.19 |
| 2026-05-13 00:00 |
10:59:00.75 |
-00:55:35.3 |
HIP 53865 |
33.36 |
| 2026-05-13 12:00 |
10:59:00.50 |
-00:55:16.1 |
HIP 53865 |
33.49 |
| 2026-05-14 00:00 |
10:59:00.41 |
-00:54:57.7 |
HIP 53865 |
33.59 |
| 2026-05-14 12:00 |
10:59:00.46 |
-00:54:40.2 |
HIP 53865 |
33.65 |
| 2026-05-15 00:00 |
10:59:00.66 |
-00:54:23.5 |
HIP 53865 |
33.67 |
| 2026-05-15 12:00 |
10:59:01.00 |
-00:54:07.6 |
HIP 53865 |
33.65 |
| 2026-05-16 00:00 |
10:59:01.50 |
-00:53:52.6 |
HIP 53865 |
33.60 |
| 2026-05-16 12:00 |
10:59:02.14 |
-00:53:38.4 |
HIP 53865 |
33.51 |
| 2026-05-17 00:00 |
10:59:02.92 |
-00:53:25.1 |
HIP 53865 |
33.39 |
| 2026-05-17 12:00 |
10:59:03.86 |
-00:53:12.7 |
HIP 53865 |
33.22 |
| 2026-05-18 00:00 |
10:59:04.94 |
-00:53:01.1 |
HIP 53865 |
33.02 |
| 2026-05-18 12:00 |
10:59:06.16 |
-00:52:50.4 |
HIP 53865 |
32.79 |
| 2026-05-19 00:00 |
10:59:07.54 |
-00:52:40.5 |
HIP 53865 |
32.51 |
| 2026-05-19 12:00 |
10:59:09.05 |
-00:52:31.5 |
HIP 53865 |
32.20 |
| 2026-05-20 00:00 |
10:59:10.72 |
-00:52:23.3 |
HIP 53865 |
31.85 |
| 2026-05-20 12:00 |
10:59:12.53 |
-00:52:16.0 |
HIP 53865 |
31.47 |
| 2026-05-21 00:00 |
10:59:14.48 |
-00:52:09.6 |
HIP 53865 |
31.05 |
| 2026-05-21 12:00 |
10:59:16.58 |
-00:52:04.1 |
HIP 53865 |
30.59 |
| 2026-05-22 00:00 |
10:59:18.82 |
-00:51:59.4 |
HIP 53865 |
30.09 |
| 2026-05-22 12:00 |
10:59:21.21 |
-00:51:55.6 |
HIP 53865 |
29.56 |
| 2026-05-23 00:00 |
10:59:23.74 |
-00:51:52.6 |
HIP 53865 |
29.00 |
| 2026-05-23 12:00 |
10:59:26.41 |
-00:51:50.5 |
HIP 53865 |
28.40 |
| 2026-05-24 00:00 |
10:59:29.23 |
-00:51:49.3 |
HIP 53865 |
27.76 |
| 2026-05-24 12:00 |
10:59:32.19 |
-00:51:49.0 |
HIP 53865 |
27.09 |
| 2026-05-25 00:00 |
10:59:35.28 |
-00:51:49.5 |
HIP 53865 |
26.38 |
| 2026-05-25 12:00 |
10:59:38.52 |
-00:51:50.9 |
HIP 53865 |
25.64 |
| 2026-05-26 00:00 |
10:59:41.90 |
-00:51:53.1 |
HIP 53865 |
24.86 |
| 2026-05-26 12:00 |
10:59:45.43 |
-00:51:56.2 |
HIP 53865 |
24.05 |
| 2026-05-27 00:00 |
10:59:49.09 |
-00:52:00.2 |
HIP 53865 |
23.21 |
| 2026-05-27 12:00 |
10:59:52.89 |
-00:52:05.1 |
HIP 53865 |
22.34 |
| 2026-05-28 00:00 |
10:59:56.82 |
-00:52:10.8 |
HIP 53865 |
21.44 |
| 2026-05-28 12:00 |
11:00:00.90 |
-00:52:17.4 |
HIP 53865 |
20.51 |
| 2026-05-29 00:00 |
11:00:05.12 |
-00:52:24.8 |
HIP 53865 |
19.55 |
| 2026-05-29 12:00 |
11:00:09.47 |
-00:52:33.1 |
HIP 53865 |
18.57 |
| 2026-05-30 00:00 |
11:00:13.96 |
-00:52:42.3 |
HIP 53865 |
17.56 |
| 2026-05-30 12:00 |
11:00:18.58 |
-00:52:52.3 |
HIP 53865 |
16.54 |
| 2026-05-31 00:00 |
11:00:23.34 |
-00:53:03.2 |
HIP 53865 |
15.50 |
| 2026-05-31 12:00 |
11:00:28.24 |
-00:53:15.0 |
HIP 53865 |
14.45 |
| 2026-06-01 00:00 |
11:00:33.27 |
-00:53:27.6 |
HIP 53865 |
13.39 |
| 2026-06-01 12:00 |
11:00:38.44 |
-00:53:41.0 |
HIP 53865 |
12.35 |
| 2026-06-02 00:00 |
11:00:43.74 |
-00:53:55.4 |
HIP 53865 |
11.33 |