| 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) |
| 2026-06-01 00:00 |
13:52:34.80 |
-59:26:59.4 |
HIP 67684 |
14.78 |
| 2026-06-01 12:00 |
13:52:30.83 |
-59:26:32.3 |
HIP 67684 |
15.05 |
| 2026-06-02 00:00 |
13:52:26.88 |
-59:26:05.1 |
HIP 67552 |
15.26 |
| 2026-06-02 12:00 |
13:52:22.97 |
-59:25:37.7 |
HIP 67552 |
14.66 |
| 2026-06-03 00:00 |
13:52:19.10 |
-59:25:10.2 |
HIP 67552 |
14.08 |
| 2026-06-03 12:00 |
13:52:15.25 |
-59:24:42.5 |
HIP 67552 |
13.50 |
| 2026-06-04 00:00 |
13:52:11.44 |
-59:24:14.7 |
HIP 67552 |
12.94 |
| 2026-06-04 12:00 |
13:52:07.66 |
-59:23:46.8 |
HIP 67552 |
12.39 |
| 2026-06-05 00:00 |
13:52:03.91 |
-59:23:18.7 |
HIP 67552 |
11.86 |
| 2026-06-05 12:00 |
13:52:00.20 |
-59:22:50.5 |
HIP 67552 |
11.35 |
| 2026-06-06 00:00 |
13:51:56.52 |
-59:22:22.1 |
HIP 67552 |
10.86 |
| 2026-06-06 12:00 |
13:51:52.87 |
-59:21:53.6 |
HIP 67552 |
10.39 |
| 2026-06-07 00:00 |
13:51:49.26 |
-59:21:25.0 |
HIP 67552 |
9.95 |
| 2026-06-07 12:00 |
13:51:45.68 |
-59:20:56.2 |
HIP 67552 |
9.54 |
| 2026-06-08 00:00 |
13:51:42.14 |
-59:20:27.3 |
HIP 67552 |
9.16 |
| 2026-06-08 12:00 |
13:51:38.63 |
-59:19:58.3 |
HIP 67552 |
8.82 |
| 2026-06-09 00:00 |
13:51:35.16 |
-59:19:29.2 |
HIP 67552 |
8.52 |
| 2026-06-09 12:00 |
13:51:31.72 |
-59:19:00.0 |
HIP 67552 |
8.27 |
| 2026-06-10 00:00 |
13:51:28.32 |
-59:18:30.6 |
HIP 67552 |
8.07 |
| 2026-06-10 12:00 |
13:51:24.96 |
-59:18:01.1 |
HIP 67552 |
7.92 |
| 2026-06-11 00:00 |
13:51:21.63 |
-59:17:31.5 |
HIP 67552 |
7.83 |
| 2026-06-11 12:00 |
13:51:18.34 |
-59:17:01.8 |
HIP 67552 |
7.80 |
| 2026-06-12 00:00 |
13:51:15.08 |
-59:16:32.0 |
HIP 67552 |
7.83 |
| 2026-06-12 12:00 |
13:51:11.86 |
-59:16:02.1 |
HIP 67552 |
7.91 |
| 2026-06-13 00:00 |
13:51:08.68 |
-59:15:32.1 |
HIP 67552 |
8.05 |
| 2026-06-13 12:00 |
13:51:05.54 |
-59:15:02.0 |
HIP 67552 |
8.24 |
| 2026-06-14 00:00 |
13:51:02.43 |
-59:14:31.8 |
HIP 67552 |
8.48 |
| 2026-06-14 12:00 |
13:50:59.36 |
-59:14:01.5 |
HIP 67552 |
8.76 |
| 2026-06-15 00:00 |
13:50:56.33 |
-59:13:31.1 |
HIP 67552 |
9.08 |
| 2026-06-15 12:00 |
13:50:53.34 |
-59:13:00.6 |
HIP 67552 |
9.44 |
| 2026-06-16 00:00 |
13:50:50.39 |
-59:12:30.1 |
HIP 67557 |
9.72 |
| 2026-06-16 12:00 |
13:50:47.47 |
-59:11:59.4 |
HIP 67557 |
9.15 |
| 2026-06-17 00:00 |
13:50:44.60 |
-59:11:28.7 |
HIP 67557 |
8.59 |
| 2026-06-17 12:00 |
13:50:41.76 |
-59:10:57.9 |
HIP 67557 |
8.04 |
| 2026-06-18 00:00 |
13:50:38.97 |
-59:10:27.0 |
HIP 67557 |
7.50 |
| 2026-06-18 12:00 |
13:50:36.21 |
-59:09:56.1 |
HIP 67557 |
6.97 |
| 2026-06-19 00:00 |
13:50:33.49 |
-59:09:25.1 |
HIP 67557 |
6.46 |
| 2026-06-19 12:00 |
13:50:30.81 |
-59:08:54.0 |
HIP 67557 |
5.96 |
| 2026-06-20 00:00 |
13:50:28.18 |
-59:08:22.9 |
HIP 67557 |
5.50 |
| 2026-06-20 12:00 |
13:50:25.58 |
-59:07:51.7 |
HIP 67557 |
5.06 |
| 2026-06-21 00:00 |
13:50:23.02 |
-59:07:20.4 |
HIP 67557 |
4.66 |
| 2026-06-21 12:00 |
13:50:20.50 |
-59:06:49.1 |
HIP 67557 |
4.31 |
| 2026-06-22 00:00 |
13:50:18.03 |
-59:06:17.7 |
HIP 67557 |
4.02 |