メタデータ
| 項目 |
値 |
| Designation |
C/1899 E1 (Swift) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1899-04-13T11:27:00.100800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:55Z |
| Obs used |
151 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1899-05-04.0000000 |
| e |
1.00032525 |
| q (au) |
0.326562 |
| a (au) |
-1004.044294 |
| i (deg) |
146.270427 |
| Ω (om, deg) |
26.405893 |
| ω (w, deg) |
8.705696 |
| M (ma, deg) |
0.000636 |
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) |
| 2026-05-12 00:00 |
13:25:24.73 |
-10:53:01.1 |
HIP 65474 |
16.96 |
| 2026-05-12 12:00 |
13:25:24.04 |
-10:52:56.9 |
HIP 65474 |
17.00 |
| 2026-05-13 00:00 |
13:25:23.35 |
-10:52:52.7 |
HIP 65474 |
17.04 |
| 2026-05-13 12:00 |
13:25:22.67 |
-10:52:48.6 |
HIP 65474 |
17.08 |
| 2026-05-14 00:00 |
13:25:21.99 |
-10:52:44.4 |
HIP 65474 |
17.13 |
| 2026-05-14 12:00 |
13:25:21.31 |
-10:52:40.3 |
HIP 65474 |
17.17 |
| 2026-05-15 00:00 |
13:25:20.63 |
-10:52:36.1 |
HIP 65474 |
17.22 |
| 2026-05-15 12:00 |
13:25:19.96 |
-10:52:32.0 |
HIP 65474 |
17.26 |
| 2026-05-16 00:00 |
13:25:19.29 |
-10:52:27.9 |
HIP 65474 |
17.31 |
| 2026-05-16 12:00 |
13:25:18.63 |
-10:52:23.8 |
HIP 65474 |
17.36 |
| 2026-05-17 00:00 |
13:25:17.97 |
-10:52:19.8 |
HIP 65474 |
17.41 |
| 2026-05-17 12:00 |
13:25:17.31 |
-10:52:15.8 |
HIP 65474 |
17.47 |
| 2026-05-18 00:00 |
13:25:16.66 |
-10:52:11.7 |
HIP 65474 |
17.52 |
| 2026-05-18 12:00 |
13:25:16.01 |
-10:52:07.7 |
HIP 65474 |
17.58 |
| 2026-05-19 00:00 |
13:25:15.36 |
-10:52:03.8 |
HIP 65474 |
17.64 |
| 2026-05-19 12:00 |
13:25:14.72 |
-10:51:59.8 |
HIP 65474 |
17.69 |
| 2026-05-20 00:00 |
13:25:14.08 |
-10:51:55.9 |
HIP 65474 |
17.75 |
| 2026-05-20 12:00 |
13:25:13.44 |
-10:51:51.9 |
HIP 65474 |
17.81 |
| 2026-05-21 00:00 |
13:25:12.81 |
-10:51:48.0 |
HIP 65474 |
17.88 |
| 2026-05-21 12:00 |
13:25:12.19 |
-10:51:44.2 |
HIP 65474 |
17.94 |
| 2026-05-22 00:00 |
13:25:11.56 |
-10:51:40.3 |
HIP 65474 |
18.00 |
| 2026-05-22 12:00 |
13:25:10.95 |
-10:51:36.5 |
HIP 65474 |
18.07 |
| 2026-05-23 00:00 |
13:25:10.33 |
-10:51:32.6 |
HIP 65474 |
18.13 |
| 2026-05-23 12:00 |
13:25:09.72 |
-10:51:28.8 |
HIP 65474 |
18.20 |
| 2026-05-24 00:00 |
13:25:09.12 |
-10:51:25.1 |
HIP 65474 |
18.27 |
| 2026-05-24 12:00 |
13:25:08.51 |
-10:51:21.3 |
HIP 65474 |
18.34 |
| 2026-05-25 00:00 |
13:25:07.92 |
-10:51:17.6 |
HIP 65474 |
18.40 |
| 2026-05-25 12:00 |
13:25:07.32 |
-10:51:13.9 |
HIP 65474 |
18.47 |
| 2026-05-26 00:00 |
13:25:06.73 |
-10:51:10.2 |
HIP 65474 |
18.54 |
| 2026-05-26 12:00 |
13:25:06.15 |
-10:51:06.5 |
HIP 65474 |
18.61 |
| 2026-05-27 00:00 |
13:25:05.57 |
-10:51:02.9 |
HIP 65474 |
18.69 |
| 2026-05-27 12:00 |
13:25:04.99 |
-10:50:59.3 |
HIP 65474 |
18.76 |
| 2026-05-28 00:00 |
13:25:04.42 |
-10:50:55.7 |
HIP 65474 |
18.83 |
| 2026-05-28 12:00 |
13:25:03.86 |
-10:50:52.1 |
HIP 65474 |
18.90 |
| 2026-05-29 00:00 |
13:25:03.30 |
-10:50:48.6 |
HIP 65474 |
18.97 |
| 2026-05-29 12:00 |
13:25:02.74 |
-10:50:45.1 |
HIP 65474 |
19.05 |
| 2026-05-30 00:00 |
13:25:02.19 |
-10:50:41.6 |
HIP 65474 |
19.12 |
| 2026-05-30 12:00 |
13:25:01.64 |
-10:50:38.1 |
HIP 65474 |
19.20 |
| 2026-05-31 00:00 |
13:25:01.09 |
-10:50:34.7 |
HIP 65474 |
19.27 |
| 2026-05-31 12:00 |
13:25:00.56 |
-10:50:31.3 |
HIP 65474 |
19.34 |
| 2026-06-01 00:00 |
13:25:00.02 |
-10:50:27.9 |
HIP 65474 |
19.42 |
| 2026-06-01 12:00 |
13:24:59.49 |
-10:50:24.5 |
HIP 65474 |
19.49 |
| 2026-06-02 00:00 |
13:24:58.97 |
-10:50:21.2 |
HIP 65474 |
19.57 |