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) |
| 2026-09-20 00:00 |
15:10:13.52 |
-12:51:19.6 |
HIP 74210 |
8.74 |
| 2026-09-20 12:00 |
15:10:13.97 |
-12:51:22.3 |
HIP 74210 |
8.76 |
| 2026-09-21 00:00 |
15:10:14.43 |
-12:51:25.0 |
HIP 74210 |
8.79 |
| 2026-09-21 12:00 |
15:10:14.89 |
-12:51:27.7 |
HIP 74210 |
8.82 |
| 2026-09-22 00:00 |
15:10:15.36 |
-12:51:30.4 |
HIP 74210 |
8.85 |
| 2026-09-22 12:00 |
15:10:15.83 |
-12:51:33.2 |
HIP 74210 |
8.89 |
| 2026-09-23 00:00 |
15:10:16.31 |
-12:51:35.9 |
HIP 74210 |
8.92 |
| 2026-09-23 12:00 |
15:10:16.79 |
-12:51:38.7 |
HIP 74210 |
8.96 |
| 2026-09-24 00:00 |
15:10:17.28 |
-12:51:41.5 |
HIP 74210 |
9.00 |
| 2026-09-24 12:00 |
15:10:17.77 |
-12:51:44.3 |
HIP 74210 |
9.04 |
| 2026-09-25 00:00 |
15:10:18.26 |
-12:51:47.1 |
HIP 74210 |
9.09 |
| 2026-09-25 12:00 |
15:10:18.76 |
-12:51:49.9 |
HIP 74210 |
9.13 |
| 2026-09-26 00:00 |
15:10:19.27 |
-12:51:52.8 |
HIP 74210 |
9.18 |
| 2026-09-26 12:00 |
15:10:19.78 |
-12:51:55.6 |
HIP 74210 |
9.23 |
| 2026-09-27 00:00 |
15:10:20.29 |
-12:51:58.5 |
HIP 74210 |
9.29 |
| 2026-09-27 12:00 |
15:10:20.81 |
-12:52:01.4 |
HIP 74210 |
9.34 |
| 2026-09-28 00:00 |
15:10:21.34 |
-12:52:04.3 |
HIP 74210 |
9.40 |
| 2026-09-28 12:00 |
15:10:21.86 |
-12:52:07.2 |
HIP 74210 |
9.46 |
| 2026-09-29 00:00 |
15:10:22.40 |
-12:52:10.1 |
HIP 74210 |
9.52 |
| 2026-09-29 12:00 |
15:10:22.93 |
-12:52:13.0 |
HIP 74210 |
9.59 |
| 2026-09-30 00:00 |
15:10:23.48 |
-12:52:16.0 |
HIP 74210 |
9.65 |
| 2026-09-30 12:00 |
15:10:24.02 |
-12:52:18.9 |
HIP 74210 |
9.72 |
| 2026-10-01 00:00 |
15:10:24.57 |
-12:52:21.9 |
HIP 74210 |
9.79 |
| 2026-10-01 12:00 |
15:10:25.13 |
-12:52:24.9 |
HIP 74210 |
9.87 |
| 2026-10-02 00:00 |
15:10:25.68 |
-12:52:27.9 |
HIP 74210 |
9.94 |
| 2026-10-02 12:00 |
15:10:26.25 |
-12:52:30.9 |
HIP 74210 |
10.02 |
| 2026-10-03 00:00 |
15:10:26.81 |
-12:52:33.9 |
HIP 74210 |
10.10 |
| 2026-10-03 12:00 |
15:10:27.38 |
-12:52:36.9 |
HIP 74210 |
10.19 |
| 2026-10-04 00:00 |
15:10:27.96 |
-12:52:39.9 |
HIP 74210 |
10.27 |
| 2026-10-04 12:00 |
15:10:28.54 |
-12:52:43.0 |
HIP 74210 |
10.36 |
| 2026-10-05 00:00 |
15:10:29.12 |
-12:52:46.0 |
HIP 74210 |
10.45 |
| 2026-10-05 12:00 |
15:10:29.71 |
-12:52:49.1 |
HIP 74210 |
10.54 |
| 2026-10-06 00:00 |
15:10:30.30 |
-12:52:52.2 |
HIP 74210 |
10.63 |
| 2026-10-06 12:00 |
15:10:30.90 |
-12:52:55.3 |
HIP 74210 |
10.73 |
| 2026-10-07 00:00 |
15:10:31.49 |
-12:52:58.3 |
HIP 74210 |
10.82 |
| 2026-10-07 12:00 |
15:10:32.10 |
-12:53:01.4 |
HIP 74210 |
10.92 |
| 2026-10-08 00:00 |
15:10:32.70 |
-12:53:04.5 |
HIP 74210 |
11.03 |
| 2026-10-08 12:00 |
15:10:33.31 |
-12:53:07.7 |
HIP 74210 |
11.13 |
| 2026-10-09 00:00 |
15:10:33.93 |
-12:53:10.8 |
HIP 74210 |
11.24 |
| 2026-10-09 12:00 |
15:10:34.55 |
-12:53:13.9 |
HIP 74210 |
11.34 |
| 2026-10-10 00:00 |
15:10:35.17 |
-12:53:17.0 |
HIP 74210 |
11.45 |
| 2026-10-10 12:00 |
15:10:35.79 |
-12:53:20.2 |
HIP 74210 |
11.56 |
| 2026-10-11 00:00 |
15:10:36.42 |
-12:53:23.3 |
HIP 74210 |
11.68 |