メタデータ
| 項目 |
値 |
| Designation |
C/2004 Q2 (Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-01-24T21:52:04.915200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:43Z |
| Obs used |
3612 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-03-30.0000000 |
| e |
0.99950132 |
| q (au) |
1.205042 |
| a (au) |
2416.445814 |
| i (deg) |
38.588949 |
| Ω (om, deg) |
93.622895 |
| ω (w, deg) |
19.504703 |
| M (ma, deg) |
0.000532 |
等級
散乱 + 全体線形
$$
M_a = (4.612 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.612 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.921 |
| k |
0.988 |
| δ90 |
1.000 |
| 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 |
| 2004-08-28 |
2005-01-24 |
-4.3509 |
+1.375 |
| 2005-01-24 |
2006-09-09 |
-1.9949 |
+0.688 |
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 |
18:10:21.74 |
-23:40:14.2 |
HIP 89046 |
6.54 |
| 2026-09-20 12:00 |
18:10:21.60 |
-23:40:15.1 |
HIP 89046 |
6.56 |
| 2026-09-21 00:00 |
18:10:21.49 |
-23:40:15.9 |
HIP 89046 |
6.59 |
| 2026-09-21 12:00 |
18:10:21.41 |
-23:40:16.7 |
HIP 89046 |
6.60 |
| 2026-09-22 00:00 |
18:10:21.35 |
-23:40:17.5 |
HIP 89046 |
6.62 |
| 2026-09-22 12:00 |
18:10:21.32 |
-23:40:18.3 |
HIP 89046 |
6.64 |
| 2026-09-23 00:00 |
18:10:21.31 |
-23:40:19.0 |
HIP 89046 |
6.65 |
| 2026-09-23 12:00 |
18:10:21.33 |
-23:40:19.8 |
HIP 89046 |
6.66 |
| 2026-09-24 00:00 |
18:10:21.38 |
-23:40:20.6 |
HIP 89046 |
6.67 |
| 2026-09-24 12:00 |
18:10:21.45 |
-23:40:21.3 |
HIP 89046 |
6.68 |
| 2026-09-25 00:00 |
18:10:21.55 |
-23:40:22.1 |
HIP 89046 |
6.68 |
| 2026-09-25 12:00 |
18:10:21.67 |
-23:40:22.8 |
HIP 89046 |
6.68 |
| 2026-09-26 00:00 |
18:10:21.82 |
-23:40:23.6 |
HIP 89046 |
6.69 |
| 2026-09-26 12:00 |
18:10:22.00 |
-23:40:24.3 |
HIP 89046 |
6.69 |
| 2026-09-27 00:00 |
18:10:22.20 |
-23:40:25.0 |
HIP 89046 |
6.68 |
| 2026-09-27 12:00 |
18:10:22.43 |
-23:40:25.8 |
HIP 89046 |
6.68 |
| 2026-09-28 00:00 |
18:10:22.68 |
-23:40:26.5 |
HIP 89046 |
6.68 |
| 2026-09-28 12:00 |
18:10:22.96 |
-23:40:27.2 |
HIP 89046 |
6.67 |
| 2026-09-29 00:00 |
18:10:23.27 |
-23:40:27.9 |
HIP 89046 |
6.67 |
| 2026-09-29 12:00 |
18:10:23.60 |
-23:40:28.6 |
HIP 89046 |
6.66 |
| 2026-09-30 00:00 |
18:10:23.96 |
-23:40:29.3 |
HIP 89046 |
6.65 |
| 2026-09-30 12:00 |
18:10:24.34 |
-23:40:29.9 |
HIP 89046 |
6.64 |
| 2026-10-01 00:00 |
18:10:24.75 |
-23:40:30.6 |
HIP 89046 |
6.64 |
| 2026-10-01 12:00 |
18:10:25.19 |
-23:40:31.3 |
HIP 89046 |
6.63 |
| 2026-10-02 00:00 |
18:10:25.65 |
-23:40:31.9 |
HIP 89046 |
6.62 |
| 2026-10-02 12:00 |
18:10:26.13 |
-23:40:32.6 |
HIP 89084 |
6.54 |
| 2026-10-03 00:00 |
18:10:26.65 |
-23:40:33.2 |
HIP 89084 |
6.42 |
| 2026-10-03 12:00 |
18:10:27.18 |
-23:40:33.9 |
HIP 89084 |
6.30 |
| 2026-10-04 00:00 |
18:10:27.75 |
-23:40:34.5 |
HIP 89084 |
6.17 |
| 2026-10-04 12:00 |
18:10:28.34 |
-23:40:35.2 |
HIP 89084 |
6.03 |
| 2026-10-05 00:00 |
18:10:28.95 |
-23:40:35.8 |
HIP 89084 |
5.89 |
| 2026-10-05 12:00 |
18:10:29.59 |
-23:40:36.4 |
HIP 89084 |
5.75 |
| 2026-10-06 00:00 |
18:10:30.26 |
-23:40:37.0 |
HIP 89084 |
5.59 |
| 2026-10-06 12:00 |
18:10:30.95 |
-23:40:37.6 |
HIP 89084 |
5.44 |
| 2026-10-07 00:00 |
18:10:31.67 |
-23:40:38.2 |
HIP 89084 |
5.27 |
| 2026-10-07 12:00 |
18:10:32.41 |
-23:40:38.8 |
HIP 89084 |
5.10 |
| 2026-10-08 00:00 |
18:10:33.18 |
-23:40:39.4 |
HIP 89084 |
4.93 |
| 2026-10-08 12:00 |
18:10:33.97 |
-23:40:39.9 |
HIP 89084 |
4.75 |
| 2026-10-09 00:00 |
18:10:34.79 |
-23:40:40.5 |
HIP 89084 |
4.56 |
| 2026-10-09 12:00 |
18:10:35.64 |
-23:40:41.1 |
HIP 89084 |
4.37 |
| 2026-10-10 00:00 |
18:10:36.51 |
-23:40:41.6 |
HIP 89084 |
4.17 |
| 2026-10-10 12:00 |
18:10:37.40 |
-23:40:42.2 |
HIP 89084 |
3.97 |
| 2026-10-11 00:00 |
18:10:38.32 |
-23:40:42.7 |
HIP 89084 |
3.77 |