| Parameter |
Value |
| Designation |
C/2004 Q1 (Tucker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-12-06T20:45:50.109120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:42Z |
| Obs used |
1972 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-12-11.0000000 |
| e |
0.98903967 |
| q (au) |
2.046725 |
| a (au) |
186.739317 |
| i (deg) |
56.087689 |
| Ω (om, deg) |
22.130171 |
| ω (w, deg) |
32.968497 |
| M (ma, deg) |
0.001597 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.739 + 2.248\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.739 |
| n |
2.248 |
| gf |
1.000 |
| gb |
-0.999 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2004-08-22 |
2004-12-06 |
+31.1170 |
-10.936 |
| 2004-12-06 |
2006-04-29 |
+3.5317 |
-2.323 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
13:24:50.66 |
-16:37:23.6 |
HIP 65344 |
18.70 |
| 2026-06-01 12:00 |
13:24:48.76 |
-16:37:10.4 |
HIP 65344 |
18.28 |
| 2026-06-02 00:00 |
13:24:46.87 |
-16:36:57.3 |
HIP 65344 |
17.87 |
| 2026-06-02 12:00 |
13:24:45.01 |
-16:36:44.3 |
HIP 65344 |
17.47 |
| 2026-06-03 00:00 |
13:24:43.16 |
-16:36:31.4 |
HIP 65344 |
17.08 |
| 2026-06-03 12:00 |
13:24:41.34 |
-16:36:18.5 |
HIP 65344 |
16.69 |
| 2026-06-04 00:00 |
13:24:39.53 |
-16:36:05.7 |
HIP 65344 |
16.32 |
| 2026-06-04 12:00 |
13:24:37.74 |
-16:35:53.0 |
HIP 65344 |
15.96 |
| 2026-06-05 00:00 |
13:24:35.97 |
-16:35:40.3 |
HIP 65344 |
15.61 |
| 2026-06-05 12:00 |
13:24:34.22 |
-16:35:27.8 |
HIP 65344 |
15.26 |
| 2026-06-06 00:00 |
13:24:32.49 |
-16:35:15.3 |
HIP 65344 |
14.93 |
| 2026-06-06 12:00 |
13:24:30.78 |
-16:35:02.9 |
HIP 65344 |
14.61 |
| 2026-06-07 00:00 |
13:24:29.09 |
-16:34:50.6 |
HIP 65344 |
14.30 |
| 2026-06-07 12:00 |
13:24:27.42 |
-16:34:38.3 |
HIP 65344 |
14.01 |
| 2026-06-08 00:00 |
13:24:25.77 |
-16:34:26.2 |
HIP 65344 |
13.72 |
| 2026-06-08 12:00 |
13:24:24.13 |
-16:34:14.1 |
HIP 65344 |
13.45 |
| 2026-06-09 00:00 |
13:24:22.52 |
-16:34:02.1 |
HIP 65344 |
13.19 |
| 2026-06-09 12:00 |
13:24:20.93 |
-16:33:50.2 |
HIP 65344 |
12.94 |
| 2026-06-10 00:00 |
13:24:19.36 |
-16:33:38.4 |
HIP 65344 |
12.71 |
| 2026-06-10 12:00 |
13:24:17.82 |
-16:33:26.7 |
HIP 65344 |
12.49 |
| 2026-06-11 00:00 |
13:24:16.29 |
-16:33:15.1 |
HIP 65344 |
12.28 |
| 2026-06-11 12:00 |
13:24:14.78 |
-16:33:03.5 |
HIP 65344 |
12.09 |
| 2026-06-12 00:00 |
13:24:13.29 |
-16:32:52.1 |
HIP 65344 |
11.91 |
| 2026-06-12 12:00 |
13:24:11.83 |
-16:32:40.7 |
HIP 65344 |
11.75 |
| 2026-06-13 00:00 |
13:24:10.38 |
-16:32:29.5 |
HIP 65344 |
11.60 |
| 2026-06-13 12:00 |
13:24:08.96 |
-16:32:18.3 |
HIP 65344 |
11.47 |
| 2026-06-14 00:00 |
13:24:07.56 |
-16:32:07.3 |
HIP 65344 |
11.34 |
| 2026-06-14 12:00 |
13:24:06.18 |
-16:31:56.3 |
HIP 65344 |
11.24 |
| 2026-06-15 00:00 |
13:24:04.82 |
-16:31:45.4 |
HIP 65344 |
11.14 |
| 2026-06-15 12:00 |
13:24:03.48 |
-16:31:34.7 |
HIP 65344 |
11.06 |
| 2026-06-16 00:00 |
13:24:02.17 |
-16:31:24.0 |
HIP 65344 |
11.00 |
| 2026-06-16 12:00 |
13:24:00.87 |
-16:31:13.5 |
HIP 65344 |
10.95 |
| 2026-06-17 00:00 |
13:23:59.60 |
-16:31:03.0 |
HIP 65344 |
10.91 |
| 2026-06-17 12:00 |
13:23:58.35 |
-16:30:52.7 |
HIP 65344 |
10.88 |
| 2026-06-18 00:00 |
13:23:57.13 |
-16:30:42.4 |
HIP 65344 |
10.87 |
| 2026-06-18 12:00 |
13:23:55.92 |
-16:30:32.3 |
HIP 65344 |
10.87 |
| 2026-06-19 00:00 |
13:23:54.74 |
-16:30:22.2 |
HIP 65344 |
10.87 |
| 2026-06-19 12:00 |
13:23:53.58 |
-16:30:12.3 |
HIP 65344 |
10.89 |
| 2026-06-20 00:00 |
13:23:52.44 |
-16:30:02.5 |
HIP 65344 |
10.92 |
| 2026-06-20 12:00 |
13:23:51.32 |
-16:29:52.8 |
HIP 65344 |
10.96 |
| 2026-06-21 00:00 |
13:23:50.23 |
-16:29:43.1 |
HIP 65344 |
11.01 |
| 2026-06-21 12:00 |
13:23:49.16 |
-16:29:33.7 |
HIP 65344 |
11.07 |
| 2026-06-22 00:00 |
13:23:48.11 |
-16:29:24.3 |
HIP 65344 |
11.13 |