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) |
| 2026-03-26 00:00 |
15:12:27.07 |
-12:57:17.2 |
HIP 74301 |
18.88 |
| 2026-03-26 12:00 |
15:12:26.54 |
-12:57:14.5 |
HIP 74301 |
18.78 |
| 2026-03-27 00:00 |
15:12:26.01 |
-12:57:11.7 |
HIP 74301 |
18.67 |
| 2026-03-27 12:00 |
15:12:25.47 |
-12:57:09.0 |
HIP 74301 |
18.56 |
| 2026-03-28 00:00 |
15:12:24.93 |
-12:57:06.2 |
HIP 74301 |
18.45 |
| 2026-03-28 12:00 |
15:12:24.39 |
-12:57:03.4 |
HIP 74301 |
18.34 |
| 2026-03-29 00:00 |
15:12:23.84 |
-12:57:00.6 |
HIP 74301 |
18.23 |
| 2026-03-29 12:00 |
15:12:23.28 |
-12:56:57.8 |
HIP 74301 |
18.12 |
| 2026-03-30 00:00 |
15:12:22.72 |
-12:56:55.0 |
HIP 74301 |
18.01 |
| 2026-03-30 12:00 |
15:12:22.16 |
-12:56:52.2 |
HIP 74301 |
17.90 |
| 2026-03-31 00:00 |
15:12:21.59 |
-12:56:49.4 |
HIP 74301 |
17.79 |
| 2026-03-31 12:00 |
15:12:21.02 |
-12:56:46.5 |
HIP 74301 |
17.67 |
| 2026-04-01 00:00 |
15:12:20.45 |
-12:56:43.7 |
HIP 74301 |
17.56 |
| 2026-04-01 12:00 |
15:12:19.87 |
-12:56:40.8 |
HIP 74301 |
17.45 |
| 2026-04-02 00:00 |
15:12:19.29 |
-12:56:37.9 |
HIP 74301 |
17.34 |
| 2026-04-02 12:00 |
15:12:18.70 |
-12:56:35.1 |
HIP 74301 |
17.22 |
| 2026-04-03 00:00 |
15:12:18.11 |
-12:56:32.2 |
HIP 74301 |
17.11 |
| 2026-04-03 12:00 |
15:12:17.51 |
-12:56:29.3 |
HIP 74301 |
16.99 |
| 2026-04-04 00:00 |
15:12:16.91 |
-12:56:26.3 |
HIP 74301 |
16.88 |
| 2026-04-04 12:00 |
15:12:16.31 |
-12:56:23.4 |
HIP 74301 |
16.77 |
| 2026-04-05 00:00 |
15:12:15.70 |
-12:56:20.5 |
HIP 74301 |
16.65 |
| 2026-04-05 12:00 |
15:12:15.09 |
-12:56:17.5 |
HIP 74301 |
16.54 |
| 2026-04-06 00:00 |
15:12:14.47 |
-12:56:14.6 |
HIP 74301 |
16.42 |
| 2026-04-06 12:00 |
15:12:13.85 |
-12:56:11.6 |
HIP 74301 |
16.31 |
| 2026-04-07 00:00 |
15:12:13.23 |
-12:56:08.7 |
HIP 74301 |
16.19 |
| 2026-04-07 12:00 |
15:12:12.61 |
-12:56:05.7 |
HIP 74301 |
16.08 |
| 2026-04-08 00:00 |
15:12:11.98 |
-12:56:02.7 |
HIP 74301 |
15.96 |
| 2026-04-08 12:00 |
15:12:11.34 |
-12:55:59.7 |
HIP 74301 |
15.85 |
| 2026-04-09 00:00 |
15:12:10.71 |
-12:55:56.8 |
HIP 74301 |
15.73 |
| 2026-04-09 12:00 |
15:12:10.07 |
-12:55:53.7 |
HIP 74301 |
15.62 |
| 2026-04-10 00:00 |
15:12:09.42 |
-12:55:50.7 |
HIP 74301 |
15.50 |
| 2026-04-10 12:00 |
15:12:08.78 |
-12:55:47.7 |
HIP 74301 |
15.39 |
| 2026-04-11 00:00 |
15:12:08.13 |
-12:55:44.7 |
HIP 74301 |
15.28 |
| 2026-04-11 12:00 |
15:12:07.47 |
-12:55:41.7 |
HIP 74301 |
15.16 |
| 2026-04-12 00:00 |
15:12:06.82 |
-12:55:38.7 |
HIP 74301 |
15.05 |
| 2026-04-12 12:00 |
15:12:06.16 |
-12:55:35.6 |
HIP 74301 |
14.94 |
| 2026-04-13 00:00 |
15:12:05.49 |
-12:55:32.6 |
HIP 74301 |
14.83 |
| 2026-04-13 12:00 |
15:12:04.83 |
-12:55:29.5 |
HIP 74301 |
14.71 |
| 2026-04-14 00:00 |
15:12:04.16 |
-12:55:26.5 |
HIP 74301 |
14.60 |
| 2026-04-14 12:00 |
15:12:03.49 |
-12:55:23.4 |
HIP 74301 |
14.49 |
| 2026-04-15 00:00 |
15:12:02.81 |
-12:55:20.4 |
HIP 74301 |
14.38 |
| 2026-04-15 12:00 |
15:12:02.13 |
-12:55:17.3 |
HIP 74301 |
14.27 |
| 2026-04-16 00:00 |
15:12:01.45 |
-12:55:14.2 |
HIP 74301 |
14.17 |