| Parameter |
Value |
| Designation |
C/2005 N1 (Juels-Holvorcem) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-08-22T00:59:38.316480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
226 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
10.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-10-24.0000000 |
| e |
0.99845617 |
| q (au) |
1.125447 |
| a (au) |
728.998472 |
| i (deg) |
51.180194 |
| Ω (om, deg) |
3.240351 |
| ω (w, deg) |
80.045698 |
| M (ma, deg) |
0.003153 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.252 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.252 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.638 |
| k |
0.800 |
| 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 |
| 2005-06-30 |
2005-08-21 |
+14.9257 |
-1.611 |
| 2005-08-25 |
2006-04-02 |
+0.5587 |
-0.872 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
13:53:55.03 |
-57:55:06.1 |
HIP 67659 |
21.28 |
| 2026-09-20 12:00 |
13:53:59.31 |
-57:54:59.7 |
HIP 67659 |
21.69 |
| 2026-09-21 00:00 |
13:54:03.61 |
-57:54:53.5 |
HIP 67659 |
22.10 |
| 2026-09-21 12:00 |
13:54:07.93 |
-57:54:47.6 |
HIP 67659 |
22.53 |
| 2026-09-22 00:00 |
13:54:12.27 |
-57:54:42.0 |
HIP 67659 |
22.97 |
| 2026-09-22 12:00 |
13:54:16.64 |
-57:54:36.6 |
HIP 67659 |
23.42 |
| 2026-09-23 00:00 |
13:54:21.02 |
-57:54:31.5 |
HIP 67659 |
23.89 |
| 2026-09-23 12:00 |
13:54:25.42 |
-57:54:26.7 |
HIP 67659 |
24.36 |
| 2026-09-24 00:00 |
13:54:29.85 |
-57:54:22.1 |
HIP 67659 |
24.84 |
| 2026-09-24 12:00 |
13:54:34.29 |
-57:54:17.7 |
HIP 67659 |
25.33 |
| 2026-09-25 00:00 |
13:54:38.75 |
-57:54:13.7 |
HIP 68178 |
25.35 |
| 2026-09-25 12:00 |
13:54:43.23 |
-57:54:09.8 |
HIP 68178 |
24.79 |
| 2026-09-26 00:00 |
13:54:47.73 |
-57:54:06.3 |
HIP 68178 |
24.23 |
| 2026-09-26 12:00 |
13:54:52.24 |
-57:54:03.0 |
HIP 68178 |
23.67 |
| 2026-09-27 00:00 |
13:54:56.78 |
-57:54:00.0 |
HIP 68178 |
23.12 |
| 2026-09-27 12:00 |
13:55:01.33 |
-57:53:57.2 |
HIP 68178 |
22.57 |
| 2026-09-28 00:00 |
13:55:05.90 |
-57:53:54.7 |
HIP 68178 |
22.03 |
| 2026-09-28 12:00 |
13:55:10.49 |
-57:53:52.4 |
HIP 68178 |
21.48 |
| 2026-09-29 00:00 |
13:55:15.10 |
-57:53:50.4 |
HIP 68178 |
20.95 |
| 2026-09-29 12:00 |
13:55:19.72 |
-57:53:48.7 |
HIP 68178 |
20.41 |
| 2026-09-30 00:00 |
13:55:24.35 |
-57:53:47.2 |
HIP 68178 |
19.88 |
| 2026-09-30 12:00 |
13:55:29.01 |
-57:53:46.0 |
HIP 68178 |
19.36 |
| 2026-10-01 00:00 |
13:55:33.68 |
-57:53:45.1 |
HIP 68178 |
18.85 |
| 2026-10-01 12:00 |
13:55:38.37 |
-57:53:44.4 |
HIP 68178 |
18.34 |
| 2026-10-02 00:00 |
13:55:43.07 |
-57:53:44.0 |
HIP 68178 |
17.84 |
| 2026-10-02 12:00 |
13:55:47.78 |
-57:53:43.8 |
HIP 68178 |
17.35 |
| 2026-10-03 00:00 |
13:55:52.52 |
-57:53:44.0 |
HIP 68178 |
16.87 |
| 2026-10-03 12:00 |
13:55:57.26 |
-57:53:44.3 |
HIP 68178 |
16.40 |
| 2026-10-04 00:00 |
13:56:02.02 |
-57:53:45.0 |
HIP 68178 |
15.95 |
| 2026-10-04 12:00 |
13:56:06.80 |
-57:53:45.9 |
HIP 68178 |
15.51 |
| 2026-10-05 00:00 |
13:56:11.58 |
-57:53:47.0 |
HIP 68178 |
15.08 |
| 2026-10-05 12:00 |
13:56:16.39 |
-57:53:48.4 |
HIP 68178 |
14.68 |
| 2026-10-06 00:00 |
13:56:21.20 |
-57:53:50.1 |
HIP 68178 |
14.29 |
| 2026-10-06 12:00 |
13:56:26.03 |
-57:53:52.1 |
HIP 68178 |
13.92 |
| 2026-10-07 00:00 |
13:56:30.87 |
-57:53:54.3 |
HIP 68178 |
13.58 |
| 2026-10-07 12:00 |
13:56:35.72 |
-57:53:56.8 |
HIP 68178 |
13.26 |
| 2026-10-08 00:00 |
13:56:40.59 |
-57:53:59.5 |
HIP 68178 |
12.97 |
| 2026-10-08 12:00 |
13:56:45.46 |
-57:54:02.6 |
HIP 68178 |
12.71 |
| 2026-10-09 00:00 |
13:56:50.35 |
-57:54:05.8 |
HIP 68178 |
12.49 |
| 2026-10-09 12:00 |
13:56:55.25 |
-57:54:09.4 |
HIP 68178 |
12.29 |
| 2026-10-10 00:00 |
13:57:00.16 |
-57:54:13.2 |
HIP 68178 |
12.14 |
| 2026-10-10 12:00 |
13:57:05.08 |
-57:54:17.2 |
HIP 68178 |
12.02 |
| 2026-10-11 00:00 |
13:57:10.00 |
-57:54:21.6 |
HIP 68178 |
11.94 |