| Parameter |
Value |
| Designation |
C/2006 U6 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-06-05T11:25:18.736320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:01Z |
| Obs used |
552 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
5.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-04-03.0000000 |
| e |
0.99870621 |
| q (au) |
2.498397 |
| a (au) |
1931.066467 |
| i (deg) |
84.878944 |
| Ω (om, deg) |
180.186317 |
| ω (w, deg) |
276.596980 |
| M (ma, deg) |
359.999263 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.450 + 2.405\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.450 |
| n |
2.405 |
| gf |
1.000 |
| gb |
-0.706 |
| 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 |
| 2006-09-15 |
2007-09-14 |
+2.5893 |
-1.956 |
| 2007-09-14 |
2008-05-08 |
-3.2129 |
+1.746 |
| 2008-06-11 |
2010-06-04 |
-0.0917 |
-0.202 |
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 |
15:05:58.66 |
+54:53:31.4 |
HIP 73994 |
11.33 |
| 2026-06-01 12:00 |
15:05:53.90 |
+54:53:20.1 |
HIP 73994 |
12.02 |
| 2026-06-02 00:00 |
15:05:49.15 |
+54:53:08.5 |
HIP 73994 |
12.71 |
| 2026-06-02 12:00 |
15:05:44.42 |
+54:52:56.5 |
HIP 73994 |
13.40 |
| 2026-06-03 00:00 |
15:05:39.71 |
+54:52:44.1 |
HIP 73994 |
14.09 |
| 2026-06-03 12:00 |
15:05:35.02 |
+54:52:31.3 |
HIP 73994 |
14.78 |
| 2026-06-04 00:00 |
15:05:30.36 |
+54:52:18.2 |
HIP 73994 |
15.47 |
| 2026-06-04 12:00 |
15:05:25.71 |
+54:52:04.7 |
HIP 73994 |
16.16 |
| 2026-06-05 00:00 |
15:05:21.08 |
+54:51:50.8 |
HIP 73994 |
16.85 |
| 2026-06-05 12:00 |
15:05:16.48 |
+54:51:36.5 |
HIP 73994 |
17.54 |
| 2026-06-06 00:00 |
15:05:11.90 |
+54:51:21.8 |
HIP 73994 |
18.22 |
| 2026-06-06 12:00 |
15:05:07.33 |
+54:51:06.8 |
HIP 73994 |
18.91 |
| 2026-06-07 00:00 |
15:05:02.80 |
+54:50:51.4 |
HIP 73994 |
19.59 |
| 2026-06-07 12:00 |
15:04:58.28 |
+54:50:35.6 |
HIP 73994 |
20.28 |
| 2026-06-08 00:00 |
15:04:53.79 |
+54:50:19.5 |
HIP 73909 |
20.75 |
| 2026-06-08 12:00 |
15:04:49.32 |
+54:50:03.0 |
HIP 73909 |
20.91 |
| 2026-06-09 00:00 |
15:04:44.88 |
+54:49:46.1 |
HIP 73909 |
21.09 |
| 2026-06-09 12:00 |
15:04:40.46 |
+54:49:28.9 |
HIP 73909 |
21.27 |
| 2026-06-10 00:00 |
15:04:36.06 |
+54:49:11.3 |
HIP 73909 |
21.48 |
| 2026-06-10 12:00 |
15:04:31.69 |
+54:48:53.3 |
HIP 73909 |
21.70 |
| 2026-06-11 00:00 |
15:04:27.35 |
+54:48:35.0 |
HIP 73909 |
21.93 |
| 2026-06-11 12:00 |
15:04:23.03 |
+54:48:16.3 |
HIP 73909 |
22.17 |
| 2026-06-12 00:00 |
15:04:18.74 |
+54:47:57.3 |
HIP 73909 |
22.43 |
| 2026-06-12 12:00 |
15:04:14.47 |
+54:47:37.9 |
HIP 73909 |
22.70 |
| 2026-06-13 00:00 |
15:04:10.23 |
+54:47:18.1 |
HIP 73909 |
22.98 |
| 2026-06-13 12:00 |
15:04:06.02 |
+54:46:58.0 |
HIP 73909 |
23.27 |
| 2026-06-14 00:00 |
15:04:01.84 |
+54:46:37.6 |
HIP 73909 |
23.57 |
| 2026-06-14 12:00 |
15:03:57.68 |
+54:46:16.8 |
HIP 73909 |
23.88 |
| 2026-06-15 00:00 |
15:03:53.55 |
+54:45:55.7 |
HIP 73909 |
24.20 |
| 2026-06-15 12:00 |
15:03:49.45 |
+54:45:34.2 |
HIP 73909 |
24.53 |
| 2026-06-16 00:00 |
15:03:45.38 |
+54:45:12.4 |
HIP 73909 |
24.87 |
| 2026-06-16 12:00 |
15:03:41.34 |
+54:44:50.2 |
HIP 73909 |
25.22 |
| 2026-06-17 00:00 |
15:03:37.33 |
+54:44:27.7 |
HIP 73909 |
25.57 |
| 2026-06-17 12:00 |
15:03:33.35 |
+54:44:04.9 |
HIP 73909 |
25.94 |
| 2026-06-18 00:00 |
15:03:29.40 |
+54:43:41.7 |
HIP 73909 |
26.31 |
| 2026-06-18 12:00 |
15:03:25.48 |
+54:43:18.2 |
HIP 73909 |
26.68 |
| 2026-06-19 00:00 |
15:03:21.59 |
+54:42:54.4 |
HIP 73909 |
27.07 |
| 2026-06-19 12:00 |
15:03:17.74 |
+54:42:30.2 |
HIP 73909 |
27.45 |
| 2026-06-20 00:00 |
15:03:13.91 |
+54:42:05.8 |
HIP 73909 |
27.85 |
| 2026-06-20 12:00 |
15:03:10.12 |
+54:41:41.0 |
HIP 73909 |
28.25 |
| 2026-06-21 00:00 |
15:03:06.35 |
+54:41:15.9 |
HIP 73909 |
28.65 |
| 2026-06-21 12:00 |
15:03:02.62 |
+54:40:50.5 |
HIP 73909 |
29.06 |
| 2026-06-22 00:00 |
15:02:58.93 |
+54:40:24.7 |
HIP 73909 |
29.48 |