| 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) |
| 2026-05-12 00:00 |
13:55:36.24 |
-59:42:30.6 |
HIP 67932 |
7.71 |
| 2026-05-12 12:00 |
13:55:31.26 |
-59:42:11.5 |
HIP 67932 |
7.01 |
| 2026-05-13 00:00 |
13:55:26.30 |
-59:41:52.1 |
HIP 67932 |
6.31 |
| 2026-05-13 12:00 |
13:55:21.35 |
-59:41:32.6 |
HIP 67932 |
5.60 |
| 2026-05-14 00:00 |
13:55:16.42 |
-59:41:12.7 |
HIP 67932 |
4.90 |
| 2026-05-14 12:00 |
13:55:11.52 |
-59:40:52.7 |
HIP 67932 |
4.20 |
| 2026-05-15 00:00 |
13:55:06.63 |
-59:40:32.4 |
HIP 67932 |
3.49 |
| 2026-05-15 12:00 |
13:55:01.76 |
-59:40:11.8 |
HIP 67932 |
2.79 |
| 2026-05-16 00:00 |
13:54:56.91 |
-59:39:51.1 |
HIP 67932 |
2.09 |
| 2026-05-16 12:00 |
13:54:52.09 |
-59:39:30.1 |
HIP 67932 |
1.39 |
| 2026-05-17 00:00 |
13:54:47.28 |
-59:39:08.9 |
HIP 67932 |
0.69 |
| 2026-05-17 12:00 |
13:54:42.50 |
-59:38:47.5 |
HIP 67932 |
0.12 |
| 2026-05-18 00:00 |
13:54:37.73 |
-59:38:25.8 |
HIP 67932 |
0.73 |
| 2026-05-18 12:00 |
13:54:32.99 |
-59:38:04.0 |
HIP 67932 |
1.43 |
| 2026-05-19 00:00 |
13:54:28.28 |
-59:37:41.9 |
HIP 67932 |
2.13 |
| 2026-05-19 12:00 |
13:54:23.58 |
-59:37:19.6 |
HIP 67932 |
2.82 |
| 2026-05-20 00:00 |
13:54:18.91 |
-59:36:57.1 |
HIP 67932 |
3.52 |
| 2026-05-20 12:00 |
13:54:14.27 |
-59:36:34.4 |
HIP 67932 |
4.22 |
| 2026-05-21 00:00 |
13:54:09.65 |
-59:36:11.5 |
HIP 67932 |
4.92 |
| 2026-05-21 12:00 |
13:54:05.05 |
-59:35:48.3 |
HIP 67932 |
5.62 |
| 2026-05-22 00:00 |
13:54:00.48 |
-59:35:25.0 |
HIP 67932 |
6.31 |
| 2026-05-22 12:00 |
13:53:55.93 |
-59:35:01.5 |
HIP 67932 |
7.01 |
| 2026-05-23 00:00 |
13:53:51.41 |
-59:34:37.8 |
HIP 67932 |
7.70 |
| 2026-05-23 12:00 |
13:53:46.92 |
-59:34:13.8 |
HIP 67932 |
8.40 |
| 2026-05-24 00:00 |
13:53:42.45 |
-59:33:49.7 |
HIP 67932 |
9.09 |
| 2026-05-24 12:00 |
13:53:38.01 |
-59:33:25.4 |
HIP 67932 |
9.78 |
| 2026-05-25 00:00 |
13:53:33.59 |
-59:33:00.9 |
HIP 67932 |
10.47 |
| 2026-05-25 12:00 |
13:53:29.21 |
-59:32:36.2 |
HIP 67932 |
11.16 |
| 2026-05-26 00:00 |
13:53:24.85 |
-59:32:11.4 |
HIP 67932 |
11.85 |
| 2026-05-26 12:00 |
13:53:20.52 |
-59:31:46.3 |
HIP 67932 |
12.54 |
| 2026-05-27 00:00 |
13:53:16.21 |
-59:31:21.1 |
HIP 67932 |
13.23 |
| 2026-05-27 12:00 |
13:53:11.94 |
-59:30:55.7 |
HIP 67684 |
13.86 |
| 2026-05-28 00:00 |
13:53:07.69 |
-59:30:30.1 |
HIP 67684 |
13.81 |
| 2026-05-28 12:00 |
13:53:03.48 |
-59:30:04.3 |
HIP 67684 |
13.80 |
| 2026-05-29 00:00 |
13:52:59.29 |
-59:29:38.4 |
HIP 67684 |
13.83 |
| 2026-05-29 12:00 |
13:52:55.13 |
-59:29:12.3 |
HIP 67684 |
13.90 |
| 2026-05-30 00:00 |
13:52:51.00 |
-59:28:46.0 |
HIP 67684 |
14.01 |
| 2026-05-30 12:00 |
13:52:46.91 |
-59:28:19.6 |
HIP 67684 |
14.15 |
| 2026-05-31 00:00 |
13:52:42.84 |
-59:27:53.0 |
HIP 67684 |
14.33 |
| 2026-05-31 12:00 |
13:52:38.80 |
-59:27:26.3 |
HIP 67684 |
14.54 |
| 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 |