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) |
| 2026-07-29 00:00 |
13:24:37.33 |
-10:47:35.8 |
HIP 65474 |
23.63 |
| 2026-07-29 12:00 |
13:24:37.50 |
-10:47:36.5 |
HIP 65474 |
23.60 |
| 2026-07-30 00:00 |
13:24:37.68 |
-10:47:37.2 |
HIP 65474 |
23.57 |
| 2026-07-30 12:00 |
13:24:37.86 |
-10:47:37.9 |
HIP 65474 |
23.55 |
| 2026-07-31 00:00 |
13:24:38.05 |
-10:47:38.7 |
HIP 65474 |
23.52 |
| 2026-07-31 12:00 |
13:24:38.25 |
-10:47:39.5 |
HIP 65474 |
23.49 |
| 2026-08-01 00:00 |
13:24:38.45 |
-10:47:40.3 |
HIP 65474 |
23.46 |
| 2026-08-01 12:00 |
13:24:38.66 |
-10:47:41.2 |
HIP 65474 |
23.43 |
| 2026-08-02 00:00 |
13:24:38.87 |
-10:47:42.1 |
HIP 65474 |
23.39 |
| 2026-08-02 12:00 |
13:24:39.10 |
-10:47:43.1 |
HIP 65474 |
23.36 |
| 2026-08-03 00:00 |
13:24:39.32 |
-10:47:44.1 |
HIP 65474 |
23.33 |
| 2026-08-03 12:00 |
13:24:39.56 |
-10:47:45.1 |
HIP 65474 |
23.29 |
| 2026-08-04 00:00 |
13:24:39.79 |
-10:47:46.2 |
HIP 65474 |
23.25 |
| 2026-08-04 12:00 |
13:24:40.04 |
-10:47:47.3 |
HIP 65474 |
23.22 |
| 2026-08-05 00:00 |
13:24:40.29 |
-10:47:48.4 |
HIP 65474 |
23.18 |
| 2026-08-05 12:00 |
13:24:40.55 |
-10:47:49.6 |
HIP 65474 |
23.14 |
| 2026-08-06 00:00 |
13:24:40.81 |
-10:47:50.8 |
HIP 65474 |
23.10 |
| 2026-08-06 12:00 |
13:24:41.08 |
-10:47:52.1 |
HIP 65474 |
23.06 |
| 2026-08-07 00:00 |
13:24:41.36 |
-10:47:53.4 |
HIP 65474 |
23.02 |
| 2026-08-07 12:00 |
13:24:41.64 |
-10:47:54.7 |
HIP 65474 |
22.97 |
| 2026-08-08 00:00 |
13:24:41.93 |
-10:47:56.1 |
HIP 65474 |
22.93 |
| 2026-08-08 12:00 |
13:24:42.22 |
-10:47:57.5 |
HIP 65474 |
22.88 |
| 2026-08-09 00:00 |
13:24:42.52 |
-10:47:58.9 |
HIP 65474 |
22.84 |
| 2026-08-09 12:00 |
13:24:42.82 |
-10:48:00.4 |
HIP 65474 |
22.79 |
| 2026-08-10 00:00 |
13:24:43.14 |
-10:48:01.9 |
HIP 65474 |
22.74 |
| 2026-08-10 12:00 |
13:24:43.45 |
-10:48:03.4 |
HIP 65474 |
22.70 |
| 2026-08-11 00:00 |
13:24:43.78 |
-10:48:05.0 |
HIP 65474 |
22.65 |
| 2026-08-11 12:00 |
13:24:44.10 |
-10:48:06.6 |
HIP 65474 |
22.60 |
| 2026-08-12 00:00 |
13:24:44.44 |
-10:48:08.3 |
HIP 65474 |
22.55 |
| 2026-08-12 12:00 |
13:24:44.78 |
-10:48:09.9 |
HIP 65474 |
22.49 |
| 2026-08-13 00:00 |
13:24:45.13 |
-10:48:11.7 |
HIP 65474 |
22.44 |
| 2026-08-13 12:00 |
13:24:45.48 |
-10:48:13.4 |
HIP 65474 |
22.39 |
| 2026-08-14 00:00 |
13:24:45.84 |
-10:48:15.2 |
HIP 65474 |
22.34 |
| 2026-08-14 12:00 |
13:24:46.20 |
-10:48:17.0 |
HIP 65474 |
22.28 |
| 2026-08-15 00:00 |
13:24:46.57 |
-10:48:18.9 |
HIP 65474 |
22.23 |
| 2026-08-15 12:00 |
13:24:46.94 |
-10:48:20.8 |
HIP 65474 |
22.17 |
| 2026-08-16 00:00 |
13:24:47.32 |
-10:48:22.7 |
HIP 65474 |
22.11 |
| 2026-08-16 12:00 |
13:24:47.71 |
-10:48:24.7 |
HIP 65474 |
22.06 |
| 2026-08-17 00:00 |
13:24:48.10 |
-10:48:26.7 |
HIP 65474 |
22.00 |
| 2026-08-17 12:00 |
13:24:48.50 |
-10:48:28.7 |
HIP 65474 |
21.94 |
| 2026-08-18 00:00 |
13:24:48.90 |
-10:48:30.8 |
HIP 65474 |
21.88 |
| 2026-08-18 12:00 |
13:24:49.31 |
-10:48:32.9 |
HIP 65474 |
21.82 |
| 2026-08-19 00:00 |
13:24:49.72 |
-10:48:35.1 |
HIP 65474 |
21.76 |