| Parameter |
Value |
| Designation |
C/2004 DZ61 (Catalina-LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-05-26T20:35:08.787840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:38Z |
| Obs used |
344 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-03-21.0000000 |
| e |
0.95602635 |
| q (au) |
2.013330 |
| a (au) |
45.784923 |
| i (deg) |
66.809283 |
| Ω (om, deg) |
172.791834 |
| ω (w, deg) |
44.462016 |
| M (ma, deg) |
359.787298 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.877 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.877 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
00:51:32.38 |
-18:11:14.3 |
HIP 4019 |
19.23 |
| 2026-06-01 12:00 |
00:51:34.17 |
-18:11:22.2 |
HIP 4019 |
19.11 |
| 2026-06-02 00:00 |
00:51:35.93 |
-18:11:30.2 |
HIP 4019 |
19.00 |
| 2026-06-02 12:00 |
00:51:37.68 |
-18:11:38.4 |
HIP 4019 |
18.89 |
| 2026-06-03 00:00 |
00:51:39.41 |
-18:11:46.9 |
HIP 4019 |
18.79 |
| 2026-06-03 12:00 |
00:51:41.11 |
-18:11:55.5 |
HIP 4019 |
18.70 |
| 2026-06-04 00:00 |
00:51:42.79 |
-18:12:04.3 |
HIP 4019 |
18.61 |
| 2026-06-04 12:00 |
00:51:44.46 |
-18:12:13.4 |
HIP 4019 |
18.53 |
| 2026-06-05 00:00 |
00:51:46.10 |
-18:12:22.6 |
HIP 4019 |
18.45 |
| 2026-06-05 12:00 |
00:51:47.72 |
-18:12:32.0 |
HIP 4019 |
18.38 |
| 2026-06-06 00:00 |
00:51:49.32 |
-18:12:41.6 |
HIP 4019 |
18.31 |
| 2026-06-06 12:00 |
00:51:50.90 |
-18:12:51.5 |
HIP 4019 |
18.24 |
| 2026-06-07 00:00 |
00:51:52.46 |
-18:13:01.5 |
HIP 4019 |
18.18 |
| 2026-06-07 12:00 |
00:51:53.99 |
-18:13:11.7 |
HIP 4019 |
18.13 |
| 2026-06-08 00:00 |
00:51:55.51 |
-18:13:22.2 |
HIP 4019 |
18.08 |
| 2026-06-08 12:00 |
00:51:57.00 |
-18:13:32.8 |
HIP 4019 |
18.03 |
| 2026-06-09 00:00 |
00:51:58.47 |
-18:13:43.6 |
HIP 4019 |
17.99 |
| 2026-06-09 12:00 |
00:51:59.92 |
-18:13:54.6 |
HIP 4019 |
17.94 |
| 2026-06-10 00:00 |
00:52:01.34 |
-18:14:05.8 |
HIP 4019 |
17.91 |
| 2026-06-10 12:00 |
00:52:02.75 |
-18:14:17.3 |
HIP 4019 |
17.87 |
| 2026-06-11 00:00 |
00:52:04.13 |
-18:14:28.9 |
HIP 4019 |
17.84 |
| 2026-06-11 12:00 |
00:52:05.49 |
-18:14:40.7 |
HIP 4019 |
17.81 |
| 2026-06-12 00:00 |
00:52:06.82 |
-18:14:52.7 |
HIP 4019 |
17.79 |
| 2026-06-12 12:00 |
00:52:08.14 |
-18:15:04.9 |
HIP 4019 |
17.76 |
| 2026-06-13 00:00 |
00:52:09.43 |
-18:15:17.3 |
HIP 4019 |
17.74 |
| 2026-06-13 12:00 |
00:52:10.70 |
-18:15:29.8 |
HIP 4019 |
17.72 |
| 2026-06-14 00:00 |
00:52:11.94 |
-18:15:42.6 |
HIP 4019 |
17.70 |
| 2026-06-14 12:00 |
00:52:13.16 |
-18:15:55.6 |
HIP 4019 |
17.69 |
| 2026-06-15 00:00 |
00:52:14.36 |
-18:16:08.7 |
HIP 4019 |
17.67 |
| 2026-06-15 12:00 |
00:52:15.53 |
-18:16:22.1 |
HIP 4019 |
17.66 |
| 2026-06-16 00:00 |
00:52:16.69 |
-18:16:35.6 |
HIP 4019 |
17.65 |
| 2026-06-16 12:00 |
00:52:17.81 |
-18:16:49.3 |
HIP 4019 |
17.64 |
| 2026-06-17 00:00 |
00:52:18.92 |
-18:17:03.2 |
HIP 4019 |
17.63 |
| 2026-06-17 12:00 |
00:52:20.00 |
-18:17:17.3 |
HIP 4019 |
17.62 |
| 2026-06-18 00:00 |
00:52:21.06 |
-18:17:31.6 |
HIP 4019 |
17.61 |
| 2026-06-18 12:00 |
00:52:22.09 |
-18:17:46.1 |
HIP 4019 |
17.60 |
| 2026-06-19 00:00 |
00:52:23.10 |
-18:18:00.7 |
HIP 4117 |
17.44 |
| 2026-06-19 12:00 |
00:52:24.08 |
-18:18:15.6 |
HIP 4117 |
17.13 |
| 2026-06-20 00:00 |
00:52:25.04 |
-18:18:30.6 |
HIP 4117 |
16.83 |
| 2026-06-20 12:00 |
00:52:25.98 |
-18:18:45.8 |
HIP 4117 |
16.52 |
| 2026-06-21 00:00 |
00:52:26.89 |
-18:19:01.2 |
HIP 4117 |
16.21 |
| 2026-06-21 12:00 |
00:52:27.78 |
-18:19:16.7 |
HIP 4117 |
15.91 |
| 2026-06-22 00:00 |
00:52:28.65 |
-18:19:32.5 |
HIP 4117 |
15.60 |