メタデータ
| 項目 |
値 |
| Designation |
C/1885 X1 (Fabry) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1886-04-06T10:56:04.807680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:53Z |
| Obs used |
46 |
| 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) |
1886-01-18.0000000 |
| e |
1.00038711 |
| q (au) |
0.642383 |
| a (au) |
-1659.415920 |
| i (deg) |
82.629776 |
| Ω (om, deg) |
37.962462 |
| ω (w, deg) |
126.588976 |
| M (ma, deg) |
-0.001144 |
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 |
03:22:14.63 |
-45:13:04.9 |
HIP 15548 |
20.47 |
| 2026-07-29 12:00 |
03:22:14.93 |
-45:13:14.4 |
HIP 15548 |
20.54 |
| 2026-07-30 00:00 |
03:22:15.23 |
-45:13:23.9 |
HIP 15548 |
20.62 |
| 2026-07-30 12:00 |
03:22:15.51 |
-45:13:33.4 |
HIP 15548 |
20.69 |
| 2026-07-31 00:00 |
03:22:15.79 |
-45:13:42.9 |
HIP 15548 |
20.77 |
| 2026-07-31 12:00 |
03:22:16.06 |
-45:13:52.5 |
HIP 15548 |
20.84 |
| 2026-08-01 00:00 |
03:22:16.32 |
-45:14:02.2 |
HIP 15548 |
20.91 |
| 2026-08-01 12:00 |
03:22:16.57 |
-45:14:11.8 |
HIP 15548 |
20.99 |
| 2026-08-02 00:00 |
03:22:16.81 |
-45:14:21.5 |
HIP 15548 |
21.06 |
| 2026-08-02 12:00 |
03:22:17.04 |
-45:14:31.2 |
HIP 15548 |
21.13 |
| 2026-08-03 00:00 |
03:22:17.27 |
-45:14:41.0 |
HIP 15548 |
21.20 |
| 2026-08-03 12:00 |
03:22:17.49 |
-45:14:50.7 |
HIP 15548 |
21.28 |
| 2026-08-04 00:00 |
03:22:17.69 |
-45:15:00.6 |
HIP 15548 |
21.35 |
| 2026-08-04 12:00 |
03:22:17.89 |
-45:15:10.4 |
HIP 15548 |
21.42 |
| 2026-08-05 00:00 |
03:22:18.08 |
-45:15:20.3 |
HIP 15548 |
21.49 |
| 2026-08-05 12:00 |
03:22:18.26 |
-45:15:30.2 |
HIP 15548 |
21.56 |
| 2026-08-06 00:00 |
03:22:18.44 |
-45:15:40.1 |
HIP 15548 |
21.63 |
| 2026-08-06 12:00 |
03:22:18.60 |
-45:15:50.0 |
HIP 15548 |
21.70 |
| 2026-08-07 00:00 |
03:22:18.75 |
-45:16:00.0 |
HIP 15548 |
21.77 |
| 2026-08-07 12:00 |
03:22:18.90 |
-45:16:10.0 |
HIP 15548 |
21.84 |
| 2026-08-08 00:00 |
03:22:19.04 |
-45:16:20.0 |
HIP 15548 |
21.91 |
| 2026-08-08 12:00 |
03:22:19.17 |
-45:16:30.1 |
HIP 15548 |
21.98 |
| 2026-08-09 00:00 |
03:22:19.29 |
-45:16:40.1 |
HIP 15548 |
22.05 |
| 2026-08-09 12:00 |
03:22:19.40 |
-45:16:50.2 |
HIP 15548 |
22.12 |
| 2026-08-10 00:00 |
03:22:19.50 |
-45:17:00.4 |
HIP 15548 |
22.18 |
| 2026-08-10 12:00 |
03:22:19.59 |
-45:17:10.5 |
HIP 15548 |
22.25 |
| 2026-08-11 00:00 |
03:22:19.67 |
-45:17:20.6 |
HIP 15548 |
22.32 |
| 2026-08-11 12:00 |
03:22:19.75 |
-45:17:30.8 |
HIP 15548 |
22.39 |
| 2026-08-12 00:00 |
03:22:19.81 |
-45:17:41.0 |
HIP 15548 |
22.45 |
| 2026-08-12 12:00 |
03:22:19.87 |
-45:17:51.2 |
HIP 15548 |
22.52 |
| 2026-08-13 00:00 |
03:22:19.92 |
-45:18:01.5 |
HIP 15548 |
22.58 |
| 2026-08-13 12:00 |
03:22:19.96 |
-45:18:11.7 |
HIP 15548 |
22.65 |
| 2026-08-14 00:00 |
03:22:19.99 |
-45:18:22.0 |
HIP 15548 |
22.72 |
| 2026-08-14 12:00 |
03:22:20.01 |
-45:18:32.2 |
HIP 15548 |
22.78 |
| 2026-08-15 00:00 |
03:22:20.02 |
-45:18:42.5 |
HIP 15548 |
22.85 |
| 2026-08-15 12:00 |
03:22:20.02 |
-45:18:52.8 |
HIP 15548 |
22.91 |
| 2026-08-16 00:00 |
03:22:20.01 |
-45:19:03.1 |
HIP 15548 |
22.97 |
| 2026-08-16 12:00 |
03:22:20.00 |
-45:19:13.5 |
HIP 15548 |
23.04 |
| 2026-08-17 00:00 |
03:22:19.97 |
-45:19:23.8 |
HIP 15548 |
23.10 |
| 2026-08-17 12:00 |
03:22:19.94 |
-45:19:34.1 |
HIP 15548 |
23.17 |
| 2026-08-18 00:00 |
03:22:19.90 |
-45:19:44.5 |
HIP 15548 |
23.23 |
| 2026-08-18 12:00 |
03:22:19.84 |
-45:19:54.9 |
HIP 15548 |
23.29 |
| 2026-08-19 00:00 |
03:22:19.78 |
-45:20:05.2 |
HIP 15548 |
23.35 |