メタデータ
| 項目 |
値 |
| Designation |
C/1999 F1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-02-13T15:14:58.715520Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:23Z |
| Obs used |
172 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
7.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2001-04-29.0000000 |
| e |
0.99915402 |
| q (au) |
5.787032 |
| a (au) |
6840.659124 |
| i (deg) |
92.036105 |
| Ω (om, deg) |
20.023948 |
| ω (w, deg) |
255.156809 |
| M (ma, deg) |
359.999494 |
等級
散乱 + 全体線形
$$
M_a = (0.773 + 5.058\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
0.773 |
| n |
5.058 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1999-03-13 |
2002-01-17 |
+0.3100 |
-0.124 |
| 2002-02-15 |
2005-08-28 |
-0.2027 |
-0.528 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
00:12:17.47 |
+37:13:22.5 |
HIP 1049 |
15.03 |
| 2026-09-20 12:00 |
00:12:14.09 |
+37:13:14.2 |
HIP 1049 |
15.56 |
| 2026-09-21 00:00 |
00:12:10.70 |
+37:13:05.6 |
HIP 1049 |
16.11 |
| 2026-09-21 12:00 |
00:12:07.32 |
+37:12:56.7 |
HIP 1049 |
16.67 |
| 2026-09-22 00:00 |
00:12:03.93 |
+37:12:47.7 |
HIP 1049 |
17.25 |
| 2026-09-22 12:00 |
00:12:00.54 |
+37:12:38.4 |
HIP 1049 |
17.83 |
| 2026-09-23 00:00 |
00:11:57.15 |
+37:12:28.9 |
HIP 1049 |
18.43 |
| 2026-09-23 12:00 |
00:11:53.75 |
+37:12:19.2 |
HIP 1049 |
19.04 |
| 2026-09-24 00:00 |
00:11:50.36 |
+37:12:09.2 |
HIP 1049 |
19.65 |
| 2026-09-24 12:00 |
00:11:46.96 |
+37:11:59.1 |
HIP 1049 |
20.27 |
| 2026-09-25 00:00 |
00:11:43.56 |
+37:11:48.7 |
HIP 880 |
20.09 |
| 2026-09-25 12:00 |
00:11:40.17 |
+37:11:38.0 |
HIP 880 |
19.86 |
| 2026-09-26 00:00 |
00:11:36.77 |
+37:11:27.2 |
HIP 880 |
19.67 |
| 2026-09-26 12:00 |
00:11:33.37 |
+37:11:16.1 |
HIP 880 |
19.50 |
| 2026-09-27 00:00 |
00:11:29.97 |
+37:11:04.9 |
HIP 880 |
19.36 |
| 2026-09-27 12:00 |
00:11:26.58 |
+37:10:53.4 |
HIP 880 |
19.24 |
| 2026-09-28 00:00 |
00:11:23.18 |
+37:10:41.7 |
HIP 880 |
19.15 |
| 2026-09-28 12:00 |
00:11:19.79 |
+37:10:29.7 |
HIP 880 |
19.10 |
| 2026-09-29 00:00 |
00:11:16.39 |
+37:10:17.6 |
HIP 880 |
19.07 |
| 2026-09-29 12:00 |
00:11:13.00 |
+37:10:05.2 |
HIP 880 |
19.07 |
| 2026-09-30 00:00 |
00:11:09.61 |
+37:09:52.7 |
HIP 880 |
19.10 |
| 2026-09-30 12:00 |
00:11:06.22 |
+37:09:39.9 |
HIP 880 |
19.16 |
| 2026-10-01 00:00 |
00:11:02.83 |
+37:09:26.9 |
HIP 880 |
19.25 |
| 2026-10-01 12:00 |
00:10:59.45 |
+37:09:13.7 |
HIP 880 |
19.37 |
| 2026-10-02 00:00 |
00:10:56.06 |
+37:09:00.3 |
HIP 880 |
19.51 |
| 2026-10-02 12:00 |
00:10:52.69 |
+37:08:46.7 |
HIP 880 |
19.69 |
| 2026-10-03 00:00 |
00:10:49.31 |
+37:08:32.8 |
HIP 880 |
19.89 |
| 2026-10-03 12:00 |
00:10:45.94 |
+37:08:18.8 |
HIP 880 |
20.12 |
| 2026-10-04 00:00 |
00:10:42.57 |
+37:08:04.6 |
HIP 880 |
20.37 |
| 2026-10-04 12:00 |
00:10:39.20 |
+37:07:50.1 |
HIP 880 |
20.65 |
| 2026-10-05 00:00 |
00:10:35.84 |
+37:07:35.5 |
HIP 880 |
20.95 |
| 2026-10-05 12:00 |
00:10:32.49 |
+37:07:20.6 |
HIP 880 |
21.28 |
| 2026-10-06 00:00 |
00:10:29.14 |
+37:07:05.6 |
HIP 880 |
21.63 |
| 2026-10-06 12:00 |
00:10:25.79 |
+37:06:50.3 |
HIP 880 |
21.99 |
| 2026-10-07 00:00 |
00:10:22.45 |
+37:06:34.9 |
HIP 880 |
22.38 |
| 2026-10-07 12:00 |
00:10:19.12 |
+37:06:19.3 |
HIP 880 |
22.79 |
| 2026-10-08 00:00 |
00:10:15.79 |
+37:06:03.4 |
HIP 880 |
23.21 |
| 2026-10-08 12:00 |
00:10:12.46 |
+37:05:47.4 |
HIP 880 |
23.65 |
| 2026-10-09 00:00 |
00:10:09.15 |
+37:05:31.2 |
HIP 880 |
24.11 |
| 2026-10-09 12:00 |
00:10:05.84 |
+37:05:14.8 |
HIP 880 |
24.58 |
| 2026-10-10 00:00 |
00:10:02.53 |
+37:04:58.2 |
HIP 880 |
25.06 |
| 2026-10-10 12:00 |
00:09:59.24 |
+37:04:41.4 |
HIP 880 |
25.56 |
| 2026-10-11 00:00 |
00:09:55.95 |
+37:04:24.4 |
HIP 880 |
26.07 |