メタデータ
| 項目 |
値 |
| Designation |
C/1999 F2 (Dalcanton) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-08-23T16:33:57.314880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
7.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1999-09-29.0000000 |
| e |
0.99821105 |
| q (au) |
4.718078 |
| a (au) |
2637.338054 |
| i (deg) |
56.427410 |
| Ω (om, deg) |
210.297746 |
| ω (w, deg) |
352.352637 |
| M (ma, deg) |
0.002920 |
等級
散乱 + 全体線形
$$
M_a = (5.004 + 5.237\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.004 |
| n |
5.237 |
| gf |
1.000 |
| gb |
-0.608 |
| 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 |
23:08:05.37 |
+33:16:54.0 |
HIP 114121 |
23.03 |
| 2026-06-01 12:00 |
23:08:05.82 |
+33:17:17.2 |
HIP 114121 |
23.35 |
| 2026-06-02 00:00 |
23:08:06.25 |
+33:17:40.4 |
HIP 114121 |
23.68 |
| 2026-06-02 12:00 |
23:08:06.66 |
+33:18:03.6 |
HIP 114121 |
24.00 |
| 2026-06-03 00:00 |
23:08:07.05 |
+33:18:26.6 |
HIP 114121 |
24.32 |
| 2026-06-03 12:00 |
23:08:07.41 |
+33:18:49.6 |
HIP 114121 |
24.64 |
| 2026-06-04 00:00 |
23:08:07.75 |
+33:19:12.5 |
HIP 114121 |
24.96 |
| 2026-06-04 12:00 |
23:08:08.07 |
+33:19:35.3 |
HIP 114121 |
25.27 |
| 2026-06-05 00:00 |
23:08:08.36 |
+33:19:58.1 |
HIP 114121 |
25.58 |
| 2026-06-05 12:00 |
23:08:08.64 |
+33:20:20.7 |
HIP 114121 |
25.89 |
| 2026-06-06 00:00 |
23:08:08.89 |
+33:20:43.3 |
HIP 114121 |
26.20 |
| 2026-06-06 12:00 |
23:08:09.11 |
+33:21:05.8 |
HIP 114121 |
26.50 |
| 2026-06-07 00:00 |
23:08:09.32 |
+33:21:28.2 |
HIP 114121 |
26.80 |
| 2026-06-07 12:00 |
23:08:09.50 |
+33:21:50.5 |
HIP 114121 |
27.10 |
| 2026-06-08 00:00 |
23:08:09.66 |
+33:22:12.7 |
HIP 114121 |
27.40 |
| 2026-06-08 12:00 |
23:08:09.79 |
+33:22:34.9 |
HIP 114121 |
27.70 |
| 2026-06-09 00:00 |
23:08:09.90 |
+33:22:56.9 |
HIP 114121 |
27.99 |
| 2026-06-09 12:00 |
23:08:09.99 |
+33:23:18.9 |
HIP 114116 |
28.28 |
| 2026-06-10 00:00 |
23:08:10.06 |
+33:23:40.7 |
HIP 114116 |
28.56 |
| 2026-06-10 12:00 |
23:08:10.10 |
+33:24:02.5 |
HIP 114116 |
28.84 |
| 2026-06-11 00:00 |
23:08:10.13 |
+33:24:24.1 |
HIP 114116 |
29.11 |
| 2026-06-11 12:00 |
23:08:10.12 |
+33:24:45.7 |
HIP 114116 |
29.39 |
| 2026-06-12 00:00 |
23:08:10.10 |
+33:25:07.1 |
HIP 114116 |
29.66 |
| 2026-06-12 12:00 |
23:08:10.05 |
+33:25:28.5 |
HIP 114116 |
29.93 |
| 2026-06-13 00:00 |
23:08:09.98 |
+33:25:49.7 |
HIP 114116 |
30.20 |
| 2026-06-13 12:00 |
23:08:09.88 |
+33:26:10.8 |
HIP 114116 |
30.46 |
| 2026-06-14 00:00 |
23:08:09.77 |
+33:26:31.8 |
HIP 114116 |
30.72 |
| 2026-06-14 12:00 |
23:08:09.62 |
+33:26:52.7 |
HIP 114116 |
30.98 |
| 2026-06-15 00:00 |
23:08:09.46 |
+33:27:13.5 |
HIP 114404 |
31.20 |
| 2026-06-15 12:00 |
23:08:09.27 |
+33:27:34.2 |
HIP 114404 |
31.02 |
| 2026-06-16 00:00 |
23:08:09.07 |
+33:27:54.8 |
HIP 114404 |
30.85 |
| 2026-06-16 12:00 |
23:08:08.83 |
+33:28:15.2 |
HIP 114404 |
30.69 |
| 2026-06-17 00:00 |
23:08:08.58 |
+33:28:35.5 |
HIP 114404 |
30.54 |
| 2026-06-17 12:00 |
23:08:08.30 |
+33:28:55.7 |
HIP 114404 |
30.39 |
| 2026-06-18 00:00 |
23:08:08.00 |
+33:29:15.8 |
HIP 114404 |
30.26 |
| 2026-06-18 12:00 |
23:08:07.67 |
+33:29:35.7 |
HIP 114404 |
30.13 |
| 2026-06-19 00:00 |
23:08:07.33 |
+33:29:55.5 |
HIP 114404 |
30.01 |
| 2026-06-19 12:00 |
23:08:06.96 |
+33:30:15.2 |
HIP 114404 |
29.90 |
| 2026-06-20 00:00 |
23:08:06.57 |
+33:30:34.8 |
HIP 114404 |
29.80 |
| 2026-06-20 12:00 |
23:08:06.15 |
+33:30:54.2 |
HIP 114404 |
29.70 |
| 2026-06-21 00:00 |
23:08:05.71 |
+33:31:13.5 |
HIP 114404 |
29.62 |
| 2026-06-21 12:00 |
23:08:05.25 |
+33:31:32.7 |
HIP 114404 |
29.54 |
| 2026-06-22 00:00 |
23:08:04.77 |
+33:31:51.7 |
HIP 114404 |
29.48 |