C/1999 A1 (Tilbrook)
メタデータ
| 項目 |
値 |
| Designation |
C/1999 A1 (Tilbrook) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-01-29T15:46:41.666880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
68 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-01-20.0000000 |
| e |
0.99589489 |
| q (au) |
0.730741 |
| a (au) |
178.007719 |
| i (deg) |
89.481788 |
| Ω (om, deg) |
259.123002 |
| ω (w, deg) |
232.669862 |
| M (ma, deg) |
359.995992 |
等級
散乱 + 全体線形
$$
M_a = (13.200 + 2.643\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.200 |
| n |
2.643 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-02-03 00:00 |
17:30:25.06 |
+15:52:27.7 |
HIP 85626 |
9.71 |
| 2026-02-03 12:00 |
17:30:26.69 |
+15:52:45.6 |
HIP 85626 |
9.88 |
| 2026-02-04 00:00 |
17:30:28.29 |
+15:53:03.6 |
HIP 85626 |
10.07 |
| 2026-02-04 12:00 |
17:30:29.88 |
+15:53:21.8 |
HIP 85626 |
10.27 |
| 2026-02-05 00:00 |
17:30:31.45 |
+15:53:40.1 |
HIP 85626 |
10.49 |
| 2026-02-05 12:00 |
17:30:33.00 |
+15:53:58.5 |
HIP 85626 |
10.72 |
| 2026-02-06 00:00 |
17:30:34.54 |
+15:54:17.1 |
HIP 85626 |
10.96 |
| 2026-02-06 12:00 |
17:30:36.06 |
+15:54:35.8 |
HIP 85626 |
11.21 |
| 2026-02-07 00:00 |
17:30:37.56 |
+15:54:54.6 |
HIP 85626 |
11.47 |
| 2026-02-07 12:00 |
17:30:39.04 |
+15:55:13.6 |
HIP 85626 |
11.74 |
| 2026-02-08 00:00 |
17:30:40.51 |
+15:55:32.7 |
HIP 85626 |
12.02 |
| 2026-02-08 12:00 |
17:30:41.96 |
+15:55:51.9 |
HIP 85626 |
12.31 |
| 2026-02-09 00:00 |
17:30:43.39 |
+15:56:11.3 |
HIP 85626 |
12.60 |
| 2026-02-09 12:00 |
17:30:44.80 |
+15:56:30.7 |
HIP 85626 |
12.90 |
| 2026-02-10 00:00 |
17:30:46.19 |
+15:56:50.3 |
HIP 85626 |
13.20 |
| 2026-02-10 12:00 |
17:30:47.57 |
+15:57:10.1 |
HIP 85626 |
13.51 |
| 2026-02-11 00:00 |
17:30:48.92 |
+15:57:29.9 |
HIP 85626 |
13.82 |
| 2026-02-11 12:00 |
17:30:50.26 |
+15:57:49.9 |
HIP 85626 |
14.14 |
| 2026-02-12 00:00 |
17:30:51.58 |
+15:58:10.0 |
HIP 85626 |
14.46 |
| 2026-02-12 12:00 |
17:30:52.88 |
+15:58:30.2 |
HIP 85626 |
14.78 |
| 2026-02-13 00:00 |
17:30:54.16 |
+15:58:50.5 |
HIP 85626 |
15.11 |
| 2026-02-13 12:00 |
17:30:55.42 |
+15:59:10.9 |
HIP 85626 |
15.44 |
| 2026-02-14 00:00 |
17:30:56.67 |
+15:59:31.5 |
HIP 85626 |
15.77 |
| 2026-02-14 12:00 |
17:30:57.89 |
+15:59:52.2 |
HIP 85626 |
16.10 |
| 2026-02-15 00:00 |
17:30:59.10 |
+16:00:12.9 |
HIP 85626 |
16.43 |
| 2026-02-15 12:00 |
17:31:00.28 |
+16:00:33.8 |
HIP 85626 |
16.77 |
| 2026-02-16 00:00 |
17:31:01.45 |
+16:00:54.8 |
HIP 85626 |
17.10 |
| 2026-02-16 12:00 |
17:31:02.59 |
+16:01:15.9 |
HIP 85626 |
17.44 |
| 2026-02-17 00:00 |
17:31:03.72 |
+16:01:37.1 |
HIP 85626 |
17.78 |
| 2026-02-17 12:00 |
17:31:04.83 |
+16:01:58.4 |
HIP 85626 |
18.11 |
| 2026-02-18 00:00 |
17:31:05.91 |
+16:02:19.8 |
HIP 85626 |
18.45 |
| 2026-02-18 12:00 |
17:31:06.98 |
+16:02:41.3 |
HIP 85626 |
18.79 |
| 2026-02-19 00:00 |
17:31:08.02 |
+16:03:02.9 |
HIP 85626 |
19.13 |
| 2026-02-19 12:00 |
17:31:09.05 |
+16:03:24.6 |
HIP 85626 |
19.46 |
| 2026-02-20 00:00 |
17:31:10.06 |
+16:03:46.4 |
HIP 85626 |
19.80 |
| 2026-02-20 12:00 |
17:31:11.04 |
+16:04:08.2 |
HIP 85626 |
20.14 |
| 2026-02-21 00:00 |
17:31:12.01 |
+16:04:30.2 |
HIP 85626 |
20.47 |
| 2026-02-21 12:00 |
17:31:12.95 |
+16:04:52.3 |
HIP 85626 |
20.81 |
| 2026-02-22 00:00 |
17:31:13.87 |
+16:05:14.4 |
HIP 85626 |
21.14 |
| 2026-02-22 12:00 |
17:31:14.78 |
+16:05:36.6 |
HIP 85626 |
21.48 |
| 2026-02-23 00:00 |
17:31:15.66 |
+16:05:59.0 |
HIP 85626 |
21.81 |
| 2026-02-23 12:00 |
17:31:16.52 |
+16:06:21.4 |
HIP 85626 |
22.15 |
| 2026-02-24 00:00 |
17:31:17.36 |
+16:06:43.8 |
HIP 85626 |
22.48 |