メタデータ
| 項目 |
値 |
| Designation |
C/1879 M1 (Swift) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1879-04-27T22:12:15.344640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:51Z |
| Obs used |
16 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
17.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1879-07-15.0000000 |
| e |
1.00000000 |
| q (au) |
0.896364 |
| a (au) |
- |
| i (deg) |
107.044636 |
| Ω (om, deg) |
47.452641 |
| ω (w, deg) |
3.742746 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-06-01 00:00 |
15:10:54.19 |
-12:50:47.2 |
HIP 74301 |
13.33 |
| 2026-06-01 12:00 |
15:10:53.49 |
-12:50:44.8 |
HIP 74301 |
13.43 |
| 2026-06-02 00:00 |
15:10:52.79 |
-12:50:42.4 |
HIP 74301 |
13.53 |
| 2026-06-02 12:00 |
15:10:52.09 |
-12:50:40.0 |
HIP 74301 |
13.63 |
| 2026-06-03 00:00 |
15:10:51.39 |
-12:50:37.6 |
HIP 74301 |
13.73 |
| 2026-06-03 12:00 |
15:10:50.70 |
-12:50:35.3 |
HIP 74301 |
13.84 |
| 2026-06-04 00:00 |
15:10:50.01 |
-12:50:33.0 |
HIP 74301 |
13.94 |
| 2026-06-04 12:00 |
15:10:49.32 |
-12:50:30.6 |
HIP 74301 |
14.05 |
| 2026-06-05 00:00 |
15:10:48.63 |
-12:50:28.3 |
HIP 74301 |
14.15 |
| 2026-06-05 12:00 |
15:10:47.95 |
-12:50:26.1 |
HIP 74301 |
14.26 |
| 2026-06-06 00:00 |
15:10:47.27 |
-12:50:23.8 |
HIP 74301 |
14.37 |
| 2026-06-06 12:00 |
15:10:46.59 |
-12:50:21.6 |
HIP 74301 |
14.47 |
| 2026-06-07 00:00 |
15:10:45.91 |
-12:50:19.3 |
HIP 74301 |
14.58 |
| 2026-06-07 12:00 |
15:10:45.24 |
-12:50:17.1 |
HIP 74301 |
14.69 |
| 2026-06-08 00:00 |
15:10:44.57 |
-12:50:14.9 |
HIP 74301 |
14.80 |
| 2026-06-08 12:00 |
15:10:43.90 |
-12:50:12.8 |
HIP 74210 |
14.86 |
| 2026-06-09 00:00 |
15:10:43.24 |
-12:50:10.6 |
HIP 74210 |
14.75 |
| 2026-06-09 12:00 |
15:10:42.57 |
-12:50:08.5 |
HIP 74210 |
14.64 |
| 2026-06-10 00:00 |
15:10:41.92 |
-12:50:06.4 |
HIP 74210 |
14.53 |
| 2026-06-10 12:00 |
15:10:41.26 |
-12:50:04.3 |
HIP 74210 |
14.42 |
| 2026-06-11 00:00 |
15:10:40.61 |
-12:50:02.2 |
HIP 74210 |
14.31 |
| 2026-06-11 12:00 |
15:10:39.96 |
-12:50:00.1 |
HIP 74210 |
14.20 |
| 2026-06-12 00:00 |
15:10:39.31 |
-12:49:58.1 |
HIP 74210 |
14.10 |
| 2026-06-12 12:00 |
15:10:38.67 |
-12:49:56.1 |
HIP 74210 |
14.00 |
| 2026-06-13 00:00 |
15:10:38.03 |
-12:49:54.1 |
HIP 74210 |
13.89 |
| 2026-06-13 12:00 |
15:10:37.39 |
-12:49:52.1 |
HIP 74210 |
13.79 |
| 2026-06-14 00:00 |
15:10:36.76 |
-12:49:50.1 |
HIP 74210 |
13.70 |
| 2026-06-14 12:00 |
15:10:36.13 |
-12:49:48.2 |
HIP 74210 |
13.60 |
| 2026-06-15 00:00 |
15:10:35.50 |
-12:49:46.3 |
HIP 74210 |
13.50 |
| 2026-06-15 12:00 |
15:10:34.88 |
-12:49:44.4 |
HIP 74210 |
13.41 |
| 2026-06-16 00:00 |
15:10:34.26 |
-12:49:42.5 |
HIP 74210 |
13.32 |
| 2026-06-16 12:00 |
15:10:33.65 |
-12:49:40.7 |
HIP 74210 |
13.23 |
| 2026-06-17 00:00 |
15:10:33.04 |
-12:49:38.9 |
HIP 74210 |
13.14 |
| 2026-06-17 12:00 |
15:10:32.43 |
-12:49:37.1 |
HIP 74210 |
13.05 |
| 2026-06-18 00:00 |
15:10:31.82 |
-12:49:35.3 |
HIP 74210 |
12.96 |
| 2026-06-18 12:00 |
15:10:31.22 |
-12:49:33.5 |
HIP 74210 |
12.88 |
| 2026-06-19 00:00 |
15:10:30.63 |
-12:49:31.8 |
HIP 74210 |
12.80 |
| 2026-06-19 12:00 |
15:10:30.03 |
-12:49:30.0 |
HIP 74210 |
12.71 |
| 2026-06-20 00:00 |
15:10:29.44 |
-12:49:28.4 |
HIP 74210 |
12.63 |
| 2026-06-20 12:00 |
15:10:28.86 |
-12:49:26.7 |
HIP 74210 |
12.56 |
| 2026-06-21 00:00 |
15:10:28.28 |
-12:49:25.0 |
HIP 74210 |
12.48 |
| 2026-06-21 12:00 |
15:10:27.70 |
-12:49:23.4 |
HIP 74210 |
12.40 |
| 2026-06-22 00:00 |
15:10:27.13 |
-12:49:21.8 |
HIP 74210 |
12.33 |