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) |
| 2026-06-01 00:00 |
17:27:45.26 |
+17:10:32.5 |
HIP 85458 |
13.59 |
| 2026-06-01 12:00 |
17:27:42.79 |
+17:10:40.0 |
HIP 85458 |
13.77 |
| 2026-06-02 00:00 |
17:27:40.32 |
+17:10:47.3 |
HIP 85458 |
13.97 |
| 2026-06-02 12:00 |
17:27:37.84 |
+17:10:54.5 |
HIP 85458 |
14.19 |
| 2026-06-03 00:00 |
17:27:35.36 |
+17:11:01.4 |
HIP 85458 |
14.42 |
| 2026-06-03 12:00 |
17:27:32.88 |
+17:11:08.1 |
HIP 85458 |
14.68 |
| 2026-06-04 00:00 |
17:27:30.39 |
+17:11:14.6 |
HIP 85458 |
14.95 |
| 2026-06-04 12:00 |
17:27:27.90 |
+17:11:21.0 |
HIP 85458 |
15.24 |
| 2026-06-05 00:00 |
17:27:25.40 |
+17:11:27.1 |
HIP 85458 |
15.55 |
| 2026-06-05 12:00 |
17:27:22.90 |
+17:11:33.1 |
HIP 85458 |
15.86 |
| 2026-06-06 00:00 |
17:27:20.40 |
+17:11:38.8 |
HIP 85458 |
16.20 |
| 2026-06-06 12:00 |
17:27:17.89 |
+17:11:44.4 |
HIP 85458 |
16.54 |
| 2026-06-07 00:00 |
17:27:15.39 |
+17:11:49.7 |
HIP 85458 |
16.90 |
| 2026-06-07 12:00 |
17:27:12.88 |
+17:11:54.9 |
HIP 85458 |
17.27 |
| 2026-06-08 00:00 |
17:27:10.36 |
+17:11:59.8 |
HIP 85458 |
17.65 |
| 2026-06-08 12:00 |
17:27:07.85 |
+17:12:04.6 |
HIP 85458 |
18.04 |
| 2026-06-09 00:00 |
17:27:05.33 |
+17:12:09.1 |
HIP 85458 |
18.44 |
| 2026-06-09 12:00 |
17:27:02.81 |
+17:12:13.5 |
HIP 85458 |
18.85 |
| 2026-06-10 00:00 |
17:27:00.29 |
+17:12:17.6 |
HIP 85458 |
19.26 |
| 2026-06-10 12:00 |
17:26:57.77 |
+17:12:21.6 |
HIP 85458 |
19.68 |
| 2026-06-11 00:00 |
17:26:55.25 |
+17:12:25.3 |
HIP 85458 |
20.11 |
| 2026-06-11 12:00 |
17:26:52.73 |
+17:12:28.9 |
HIP 85458 |
20.55 |
| 2026-06-12 00:00 |
17:26:50.20 |
+17:12:32.2 |
HIP 85458 |
20.99 |
| 2026-06-12 12:00 |
17:26:47.68 |
+17:12:35.4 |
HIP 85458 |
21.44 |
| 2026-06-13 00:00 |
17:26:45.15 |
+17:12:38.3 |
HIP 85302 |
21.37 |
| 2026-06-13 12:00 |
17:26:42.63 |
+17:12:41.0 |
HIP 85302 |
21.07 |
| 2026-06-14 00:00 |
17:26:40.10 |
+17:12:43.6 |
HIP 85302 |
20.78 |
| 2026-06-14 12:00 |
17:26:37.58 |
+17:12:45.9 |
HIP 85302 |
20.50 |
| 2026-06-15 00:00 |
17:26:35.05 |
+17:12:48.0 |
HIP 85302 |
20.24 |
| 2026-06-15 12:00 |
17:26:32.53 |
+17:12:50.0 |
HIP 85302 |
19.98 |
| 2026-06-16 00:00 |
17:26:30.01 |
+17:12:51.7 |
HIP 85302 |
19.74 |
| 2026-06-16 12:00 |
17:26:27.49 |
+17:12:53.2 |
HIP 85302 |
19.51 |
| 2026-06-17 00:00 |
17:26:24.97 |
+17:12:54.5 |
HIP 85302 |
19.30 |
| 2026-06-17 12:00 |
17:26:22.45 |
+17:12:55.7 |
HIP 85302 |
19.09 |
| 2026-06-18 00:00 |
17:26:19.93 |
+17:12:56.6 |
HIP 85302 |
18.90 |
| 2026-06-18 12:00 |
17:26:17.41 |
+17:12:57.3 |
HIP 85302 |
18.73 |
| 2026-06-19 00:00 |
17:26:14.90 |
+17:12:57.8 |
HIP 85302 |
18.57 |
| 2026-06-19 12:00 |
17:26:12.39 |
+17:12:58.1 |
HIP 85302 |
18.43 |
| 2026-06-20 00:00 |
17:26:09.88 |
+17:12:58.2 |
HIP 85302 |
18.30 |
| 2026-06-20 12:00 |
17:26:07.37 |
+17:12:58.1 |
HIP 85302 |
18.18 |
| 2026-06-21 00:00 |
17:26:04.87 |
+17:12:57.8 |
HIP 85302 |
18.09 |
| 2026-06-21 12:00 |
17:26:02.37 |
+17:12:57.3 |
HIP 85302 |
18.00 |
| 2026-06-22 00:00 |
17:25:59.87 |
+17:12:56.6 |
HIP 85302 |
17.94 |