C/2005 N1 (Juels-Holvorcem)
| 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) |
| 2026-02-03 00:00 |
14:08:42.15 |
-59:15:57.7 |
HIP 69122 |
1.91 |
| 2026-02-03 12:00 |
14:08:41.38 |
-59:16:28.8 |
HIP 69122 |
1.91 |
| 2026-02-04 00:00 |
14:08:40.56 |
-59:16:59.8 |
HIP 69122 |
2.05 |
| 2026-02-04 12:00 |
14:08:39.69 |
-59:17:30.7 |
HIP 69122 |
2.30 |
| 2026-02-05 00:00 |
14:08:38.77 |
-59:18:01.4 |
HIP 69122 |
2.65 |
| 2026-02-05 12:00 |
14:08:37.81 |
-59:18:32.0 |
HIP 69122 |
3.05 |
| 2026-02-06 00:00 |
14:08:36.80 |
-59:19:02.5 |
HIP 69122 |
3.48 |
| 2026-02-06 12:00 |
14:08:35.75 |
-59:19:32.8 |
HIP 69122 |
3.94 |
| 2026-02-07 00:00 |
14:08:34.65 |
-59:20:03.0 |
HIP 69122 |
4.42 |
| 2026-02-07 12:00 |
14:08:33.50 |
-59:20:33.0 |
HIP 69122 |
4.90 |
| 2026-02-08 00:00 |
14:08:32.30 |
-59:21:02.9 |
HIP 69122 |
5.40 |
| 2026-02-08 12:00 |
14:08:31.06 |
-59:21:32.6 |
HIP 69122 |
5.90 |
| 2026-02-09 00:00 |
14:08:29.77 |
-59:22:02.2 |
HIP 69122 |
6.40 |
| 2026-02-09 12:00 |
14:08:28.43 |
-59:22:31.6 |
HIP 69122 |
6.91 |
| 2026-02-10 00:00 |
14:08:27.05 |
-59:23:00.9 |
HIP 69122 |
7.42 |
| 2026-02-10 12:00 |
14:08:25.62 |
-59:23:30.0 |
HIP 69122 |
7.93 |
| 2026-02-11 00:00 |
14:08:24.14 |
-59:23:59.0 |
HIP 69122 |
8.44 |
| 2026-02-11 12:00 |
14:08:22.62 |
-59:24:27.8 |
HIP 69122 |
8.96 |
| 2026-02-12 00:00 |
14:08:21.05 |
-59:24:56.4 |
HIP 69122 |
9.47 |
| 2026-02-12 12:00 |
14:08:19.44 |
-59:25:24.8 |
HIP 68978 |
9.29 |
| 2026-02-13 00:00 |
14:08:17.77 |
-59:25:53.1 |
HIP 68978 |
8.86 |
| 2026-02-13 12:00 |
14:08:16.07 |
-59:26:21.2 |
HIP 68978 |
8.42 |
| 2026-02-14 00:00 |
14:08:14.31 |
-59:26:49.2 |
HIP 68978 |
8.00 |
| 2026-02-14 12:00 |
14:08:12.51 |
-59:27:16.9 |
HIP 68978 |
7.58 |
| 2026-02-15 00:00 |
14:08:10.67 |
-59:27:44.5 |
HIP 68978 |
7.17 |
| 2026-02-15 12:00 |
14:08:08.78 |
-59:28:11.9 |
HIP 68978 |
6.77 |
| 2026-02-16 00:00 |
14:08:06.84 |
-59:28:39.1 |
HIP 68978 |
6.38 |
| 2026-02-16 12:00 |
14:08:04.86 |
-59:29:06.2 |
HIP 68978 |
6.01 |
| 2026-02-17 00:00 |
14:08:02.83 |
-59:29:33.0 |
HIP 68978 |
5.65 |
| 2026-02-17 12:00 |
14:08:00.76 |
-59:29:59.7 |
HIP 68978 |
5.32 |
| 2026-02-18 00:00 |
14:07:58.64 |
-59:30:26.1 |
HIP 68978 |
5.01 |
| 2026-02-18 12:00 |
14:07:56.48 |
-59:30:52.4 |
HIP 68978 |
4.73 |
| 2026-02-19 00:00 |
14:07:54.27 |
-59:31:18.4 |
HIP 68978 |
4.49 |
| 2026-02-19 12:00 |
14:07:52.02 |
-59:31:44.3 |
HIP 68978 |
4.29 |
| 2026-02-20 00:00 |
14:07:49.73 |
-59:32:10.0 |
HIP 68978 |
4.14 |
| 2026-02-20 12:00 |
14:07:47.39 |
-59:32:35.4 |
HIP 68978 |
4.04 |
| 2026-02-21 00:00 |
14:07:45.00 |
-59:33:00.7 |
HIP 68978 |
4.01 |
| 2026-02-21 12:00 |
14:07:42.58 |
-59:33:25.7 |
HIP 68978 |
4.03 |
| 2026-02-22 00:00 |
14:07:40.11 |
-59:33:50.6 |
HIP 68978 |
4.11 |
| 2026-02-22 12:00 |
14:07:37.59 |
-59:34:15.2 |
HIP 68978 |
4.25 |
| 2026-02-23 00:00 |
14:07:35.03 |
-59:34:39.6 |
HIP 68978 |
4.44 |
| 2026-02-23 12:00 |
14:07:32.43 |
-59:35:03.8 |
HIP 68978 |
4.68 |
| 2026-02-24 00:00 |
14:07:29.79 |
-59:35:27.8 |
HIP 68978 |
4.95 |