| 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) |
| 2026-05-12 00:00 |
00:50:05.55 |
-18:08:50.0 |
HIP 3948 |
23.02 |
| 2026-05-12 12:00 |
00:50:08.05 |
-18:08:49.6 |
HIP 3948 |
22.82 |
| 2026-05-13 00:00 |
00:50:10.54 |
-18:08:49.3 |
HIP 3948 |
22.63 |
| 2026-05-13 12:00 |
00:50:13.01 |
-18:08:49.3 |
HIP 3948 |
22.46 |
| 2026-05-14 00:00 |
00:50:15.46 |
-18:08:49.5 |
HIP 3948 |
22.30 |
| 2026-05-14 12:00 |
00:50:17.90 |
-18:08:49.9 |
HIP 3948 |
22.15 |
| 2026-05-15 00:00 |
00:50:20.33 |
-18:08:50.5 |
HIP 3948 |
22.01 |
| 2026-05-15 12:00 |
00:50:22.73 |
-18:08:51.3 |
HIP 3948 |
21.88 |
| 2026-05-16 00:00 |
00:50:25.13 |
-18:08:52.3 |
HIP 3948 |
21.77 |
| 2026-05-16 12:00 |
00:50:27.50 |
-18:08:53.5 |
HIP 3948 |
21.66 |
| 2026-05-17 00:00 |
00:50:29.86 |
-18:08:54.9 |
HIP 3948 |
21.57 |
| 2026-05-17 12:00 |
00:50:32.20 |
-18:08:56.6 |
HIP 3948 |
21.49 |
| 2026-05-18 00:00 |
00:50:34.53 |
-18:08:58.4 |
HIP 3948 |
21.42 |
| 2026-05-18 12:00 |
00:50:36.84 |
-18:09:00.5 |
HIP 3948 |
21.36 |
| 2026-05-19 00:00 |
00:50:39.13 |
-18:09:02.7 |
HIP 3948 |
21.31 |
| 2026-05-19 12:00 |
00:50:41.41 |
-18:09:05.2 |
HIP 3948 |
21.27 |
| 2026-05-20 00:00 |
00:50:43.67 |
-18:09:07.9 |
HIP 3948 |
21.24 |
| 2026-05-20 12:00 |
00:50:45.91 |
-18:09:10.8 |
HIP 3948 |
21.22 |
| 2026-05-21 00:00 |
00:50:48.13 |
-18:09:13.9 |
HIP 3948 |
21.21 |
| 2026-05-21 12:00 |
00:50:50.34 |
-18:09:17.2 |
HIP 3948 |
21.21 |
| 2026-05-22 00:00 |
00:50:52.53 |
-18:09:20.7 |
HIP 3948 |
21.22 |
| 2026-05-22 12:00 |
00:50:54.70 |
-18:09:24.4 |
HIP 3948 |
21.23 |
| 2026-05-23 00:00 |
00:50:56.85 |
-18:09:28.4 |
HIP 3948 |
21.26 |
| 2026-05-23 12:00 |
00:50:58.99 |
-18:09:32.5 |
HIP 3948 |
21.29 |
| 2026-05-24 00:00 |
00:51:01.10 |
-18:09:36.9 |
HIP 3948 |
21.33 |
| 2026-05-24 12:00 |
00:51:03.20 |
-18:09:41.4 |
HIP 3948 |
21.38 |
| 2026-05-25 00:00 |
00:51:05.28 |
-18:09:46.2 |
HIP 3948 |
21.44 |
| 2026-05-25 12:00 |
00:51:07.34 |
-18:09:51.1 |
HIP 4019 |
21.34 |
| 2026-05-26 00:00 |
00:51:09.38 |
-18:09:56.3 |
HIP 4019 |
21.14 |
| 2026-05-26 12:00 |
00:51:11.40 |
-18:10:01.7 |
HIP 4019 |
20.94 |
| 2026-05-27 00:00 |
00:51:13.41 |
-18:10:07.3 |
HIP 4019 |
20.75 |
| 2026-05-27 12:00 |
00:51:15.39 |
-18:10:13.1 |
HIP 4019 |
20.57 |
| 2026-05-28 00:00 |
00:51:17.36 |
-18:10:19.1 |
HIP 4019 |
20.39 |
| 2026-05-28 12:00 |
00:51:19.31 |
-18:10:25.3 |
HIP 4019 |
20.22 |
| 2026-05-29 00:00 |
00:51:21.23 |
-18:10:31.7 |
HIP 4019 |
20.06 |
| 2026-05-29 12:00 |
00:51:23.14 |
-18:10:38.3 |
HIP 4019 |
19.90 |
| 2026-05-30 00:00 |
00:51:25.03 |
-18:10:45.1 |
HIP 4019 |
19.75 |
| 2026-05-30 12:00 |
00:51:26.89 |
-18:10:52.1 |
HIP 4019 |
19.61 |
| 2026-05-31 00:00 |
00:51:28.74 |
-18:10:59.3 |
HIP 4019 |
19.48 |
| 2026-05-31 12:00 |
00:51:30.57 |
-18:11:06.7 |
HIP 4019 |
19.35 |
| 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 |