| Parameter |
Value |
| Designation |
C/2007 VO53 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-04-26T10:19:11.421120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:13Z |
| Obs used |
701 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-08-27.0000000 |
| e |
0.99960499 |
| q (au) |
4.842735 |
| a (au) |
12259.836506 |
| i (deg) |
86.994806 |
| Ω (om, deg) |
59.744414 |
| ω (w, deg) |
75.019866 |
| M (ma, deg) |
359.999824 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.756 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.756 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
15:13:45.74 |
-48:06:36.7 |
HIP 74418 |
14.03 |
| 2026-09-20 12:00 |
15:13:48.78 |
-48:06:27.6 |
HIP 74418 |
14.55 |
| 2026-09-21 00:00 |
15:13:51.86 |
-48:06:18.8 |
HIP 74418 |
15.08 |
| 2026-09-21 12:00 |
15:13:54.96 |
-48:06:10.2 |
HIP 74418 |
15.60 |
| 2026-09-22 00:00 |
15:13:58.10 |
-48:06:01.9 |
HIP 74418 |
16.14 |
| 2026-09-22 12:00 |
15:14:01.28 |
-48:05:53.7 |
HIP 74418 |
16.67 |
| 2026-09-23 00:00 |
15:14:04.48 |
-48:05:45.8 |
HIP 74418 |
17.21 |
| 2026-09-23 12:00 |
15:14:07.72 |
-48:05:38.1 |
HIP 74696 |
17.73 |
| 2026-09-24 00:00 |
15:14:11.00 |
-48:05:30.7 |
HIP 74696 |
17.18 |
| 2026-09-24 12:00 |
15:14:14.30 |
-48:05:23.4 |
HIP 74696 |
16.62 |
| 2026-09-25 00:00 |
15:14:17.64 |
-48:05:16.4 |
HIP 74696 |
16.06 |
| 2026-09-25 12:00 |
15:14:21.00 |
-48:05:09.7 |
HIP 74696 |
15.49 |
| 2026-09-26 00:00 |
15:14:24.40 |
-48:05:03.1 |
HIP 74696 |
14.92 |
| 2026-09-26 12:00 |
15:14:27.84 |
-48:04:56.8 |
HIP 74696 |
14.35 |
| 2026-09-27 00:00 |
15:14:31.30 |
-48:04:50.7 |
HIP 74696 |
13.76 |
| 2026-09-27 12:00 |
15:14:34.79 |
-48:04:44.8 |
HIP 74696 |
13.18 |
| 2026-09-28 00:00 |
15:14:38.32 |
-48:04:39.2 |
HIP 74696 |
12.59 |
| 2026-09-28 12:00 |
15:14:41.87 |
-48:04:33.8 |
HIP 74696 |
11.99 |
| 2026-09-29 00:00 |
15:14:45.45 |
-48:04:28.7 |
HIP 74696 |
11.39 |
| 2026-09-29 12:00 |
15:14:49.07 |
-48:04:23.7 |
HIP 74696 |
10.79 |
| 2026-09-30 00:00 |
15:14:52.71 |
-48:04:19.0 |
HIP 74696 |
10.18 |
| 2026-09-30 12:00 |
15:14:56.39 |
-48:04:14.6 |
HIP 74696 |
9.57 |
| 2026-10-01 00:00 |
15:15:00.09 |
-48:04:10.3 |
HIP 74696 |
8.95 |
| 2026-10-01 12:00 |
15:15:03.82 |
-48:04:06.3 |
HIP 74696 |
8.33 |
| 2026-10-02 00:00 |
15:15:07.58 |
-48:04:02.6 |
HIP 74696 |
7.71 |
| 2026-10-02 12:00 |
15:15:11.37 |
-48:03:59.1 |
HIP 74696 |
7.08 |
| 2026-10-03 00:00 |
15:15:15.19 |
-48:03:55.8 |
HIP 74696 |
6.45 |
| 2026-10-03 12:00 |
15:15:19.04 |
-48:03:52.7 |
HIP 74696 |
5.81 |
| 2026-10-04 00:00 |
15:15:22.91 |
-48:03:49.9 |
HIP 74696 |
5.17 |
| 2026-10-04 12:00 |
15:15:26.81 |
-48:03:47.3 |
HIP 74696 |
4.53 |
| 2026-10-05 00:00 |
15:15:30.74 |
-48:03:45.0 |
HIP 74696 |
3.89 |
| 2026-10-05 12:00 |
15:15:34.70 |
-48:03:42.9 |
HIP 74696 |
3.25 |
| 2026-10-06 00:00 |
15:15:38.68 |
-48:03:41.0 |
HIP 74696 |
2.61 |
| 2026-10-06 12:00 |
15:15:42.69 |
-48:03:39.4 |
HIP 74696 |
1.98 |
| 2026-10-07 00:00 |
15:15:46.72 |
-48:03:38.0 |
HIP 74696 |
1.40 |
| 2026-10-07 12:00 |
15:15:50.79 |
-48:03:36.9 |
HIP 74696 |
0.94 |
| 2026-10-08 00:00 |
15:15:54.87 |
-48:03:36.0 |
HIP 74696 |
0.84 |
| 2026-10-08 12:00 |
15:15:58.99 |
-48:03:35.4 |
HIP 74696 |
1.22 |
| 2026-10-09 00:00 |
15:16:03.12 |
-48:03:34.9 |
HIP 74696 |
1.79 |
| 2026-10-09 12:00 |
15:16:07.29 |
-48:03:34.8 |
HIP 74725 |
1.87 |
| 2026-10-10 00:00 |
15:16:11.47 |
-48:03:34.8 |
HIP 74725 |
1.31 |
| 2026-10-10 12:00 |
15:16:15.68 |
-48:03:35.1 |
HIP 74725 |
0.94 |
| 2026-10-11 00:00 |
15:16:19.92 |
-48:03:35.7 |
HIP 74725 |
1.03 |