メタデータ
| 項目 |
値 |
| Designation |
C/2001 Q4 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-05-15T23:10:38.346240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:11Z |
| Obs used |
2617 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2004-05-15.0000000 |
| e |
1.00068805 |
| q (au) |
0.961960 |
| a (au) |
-1398.092298 |
| i (deg) |
99.642634 |
| Ω (om, deg) |
210.278440 |
| ω (w, deg) |
1.204371 |
| M (ma, deg) |
-0.000018 |
等級
散乱 + 全体線形
$$
M_a = (5.940 + 4.075\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.940 |
| n |
4.075 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.817 |
| 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 |
| 2001-08-24 |
2004-03-09 |
-1.4351 |
-0.245 |
| 2004-03-09 |
2004-03-31 |
+6.4588 |
-1.163 |
| 2004-03-31 |
2004-05-15 |
-10.1442 |
+0.669 |
| 2004-05-15 |
2004-10-18 |
-1.2518 |
+0.669 |
| 2004-10-18 |
2006-08-18 |
+0.3692 |
+0.505 |
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) |
| 2026-06-01 00:00 |
01:43:15.96 |
+27:20:42.0 |
HIP 7894 |
23.95 |
| 2026-06-01 12:00 |
01:43:18.03 |
+27:20:58.4 |
HIP 7894 |
24.48 |
| 2026-06-02 00:00 |
01:43:20.08 |
+27:21:14.9 |
HIP 7894 |
25.00 |
| 2026-06-02 12:00 |
01:43:22.12 |
+27:21:31.3 |
HIP 7894 |
25.51 |
| 2026-06-03 00:00 |
01:43:24.14 |
+27:21:47.7 |
HIP 7894 |
26.03 |
| 2026-06-03 12:00 |
01:43:26.14 |
+27:22:04.0 |
HIP 7894 |
26.54 |
| 2026-06-04 00:00 |
01:43:28.13 |
+27:22:20.4 |
HIP 7894 |
27.05 |
| 2026-06-04 12:00 |
01:43:30.11 |
+27:22:36.8 |
HIP 7894 |
27.55 |
| 2026-06-05 00:00 |
01:43:32.07 |
+27:22:53.1 |
HIP 8043 |
27.88 |
| 2026-06-05 12:00 |
01:43:34.01 |
+27:23:09.5 |
HIP 8043 |
27.68 |
| 2026-06-06 00:00 |
01:43:35.93 |
+27:23:25.8 |
HIP 8043 |
27.47 |
| 2026-06-06 12:00 |
01:43:37.84 |
+27:23:42.1 |
HIP 8043 |
27.28 |
| 2026-06-07 00:00 |
01:43:39.73 |
+27:23:58.4 |
HIP 8043 |
27.09 |
| 2026-06-07 12:00 |
01:43:41.60 |
+27:24:14.6 |
HIP 8043 |
26.91 |
| 2026-06-08 00:00 |
01:43:43.46 |
+27:24:30.9 |
HIP 8043 |
26.74 |
| 2026-06-08 12:00 |
01:43:45.30 |
+27:24:47.1 |
HIP 8043 |
26.57 |
| 2026-06-09 00:00 |
01:43:47.12 |
+27:25:03.3 |
HIP 8043 |
26.42 |
| 2026-06-09 12:00 |
01:43:48.93 |
+27:25:19.5 |
HIP 8043 |
26.26 |
| 2026-06-10 00:00 |
01:43:50.71 |
+27:25:35.6 |
HIP 8043 |
26.12 |
| 2026-06-10 12:00 |
01:43:52.48 |
+27:25:51.7 |
HIP 8043 |
25.99 |
| 2026-06-11 00:00 |
01:43:54.24 |
+27:26:07.8 |
HIP 8043 |
25.86 |
| 2026-06-11 12:00 |
01:43:55.97 |
+27:26:23.9 |
HIP 8043 |
25.73 |
| 2026-06-12 00:00 |
01:43:57.69 |
+27:26:39.9 |
HIP 8043 |
25.62 |
| 2026-06-12 12:00 |
01:43:59.38 |
+27:26:55.9 |
HIP 8043 |
25.51 |
| 2026-06-13 00:00 |
01:44:01.06 |
+27:27:11.9 |
HIP 8043 |
25.41 |
| 2026-06-13 12:00 |
01:44:02.72 |
+27:27:27.9 |
HIP 8043 |
25.32 |
| 2026-06-14 00:00 |
01:44:04.36 |
+27:27:43.8 |
HIP 8043 |
25.23 |
| 2026-06-14 12:00 |
01:44:05.99 |
+27:27:59.6 |
HIP 8043 |
25.15 |
| 2026-06-15 00:00 |
01:44:07.59 |
+27:28:15.5 |
HIP 8043 |
25.07 |
| 2026-06-15 12:00 |
01:44:09.18 |
+27:28:31.3 |
HIP 8043 |
25.00 |
| 2026-06-16 00:00 |
01:44:10.74 |
+27:28:47.0 |
HIP 8043 |
24.94 |
| 2026-06-16 12:00 |
01:44:12.29 |
+27:29:02.7 |
HIP 8043 |
24.88 |
| 2026-06-17 00:00 |
01:44:13.81 |
+27:29:18.4 |
HIP 8043 |
24.83 |
| 2026-06-17 12:00 |
01:44:15.32 |
+27:29:34.0 |
HIP 8043 |
24.78 |
| 2026-06-18 00:00 |
01:44:16.81 |
+27:29:49.6 |
HIP 8043 |
24.74 |
| 2026-06-18 12:00 |
01:44:18.28 |
+27:30:05.1 |
HIP 8043 |
24.71 |
| 2026-06-19 00:00 |
01:44:19.72 |
+27:30:20.6 |
HIP 8043 |
24.68 |
| 2026-06-19 12:00 |
01:44:21.15 |
+27:30:36.1 |
HIP 8043 |
24.65 |
| 2026-06-20 00:00 |
01:44:22.56 |
+27:30:51.5 |
HIP 8043 |
24.63 |
| 2026-06-20 12:00 |
01:44:23.95 |
+27:31:06.8 |
HIP 8043 |
24.62 |
| 2026-06-21 00:00 |
01:44:25.31 |
+27:31:22.1 |
HIP 8043 |
24.60 |
| 2026-06-21 12:00 |
01:44:26.66 |
+27:31:37.3 |
HIP 8043 |
24.60 |
| 2026-06-22 00:00 |
01:44:27.99 |
+27:31:52.5 |
HIP 8043 |
24.59 |