| 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) |
| 2026-07-29 00:00 |
15:12:12.71 |
-48:39:41.2 |
HIP 74376 |
5.33 |
| 2026-07-29 12:00 |
15:12:11.27 |
-48:39:15.9 |
HIP 74376 |
5.58 |
| 2026-07-30 00:00 |
15:12:09.87 |
-48:38:50.7 |
HIP 74376 |
5.87 |
| 2026-07-30 12:00 |
15:12:08.52 |
-48:38:25.6 |
HIP 74376 |
6.18 |
| 2026-07-31 00:00 |
15:12:07.22 |
-48:38:00.5 |
HIP 74376 |
6.51 |
| 2026-07-31 12:00 |
15:12:05.96 |
-48:37:35.5 |
HIP 74376 |
6.86 |
| 2026-08-01 00:00 |
15:12:04.75 |
-48:37:10.5 |
HIP 74376 |
7.23 |
| 2026-08-01 12:00 |
15:12:03.58 |
-48:36:45.7 |
HIP 74376 |
7.60 |
| 2026-08-02 00:00 |
15:12:02.46 |
-48:36:20.8 |
HIP 74376 |
7.98 |
| 2026-08-02 12:00 |
15:12:01.38 |
-48:35:56.1 |
HIP 74376 |
8.37 |
| 2026-08-03 00:00 |
15:12:00.35 |
-48:35:31.4 |
HIP 74376 |
8.77 |
| 2026-08-03 12:00 |
15:11:59.36 |
-48:35:06.8 |
HIP 74376 |
9.16 |
| 2026-08-04 00:00 |
15:11:58.42 |
-48:34:42.3 |
HIP 74376 |
9.56 |
| 2026-08-04 12:00 |
15:11:57.52 |
-48:34:17.9 |
HIP 74376 |
9.97 |
| 2026-08-05 00:00 |
15:11:56.67 |
-48:33:53.5 |
HIP 74376 |
10.37 |
| 2026-08-05 12:00 |
15:11:55.87 |
-48:33:29.2 |
HIP 74376 |
10.77 |
| 2026-08-06 00:00 |
15:11:55.11 |
-48:33:05.1 |
HIP 74285 |
10.55 |
| 2026-08-06 12:00 |
15:11:54.40 |
-48:32:41.0 |
HIP 74285 |
10.34 |
| 2026-08-07 00:00 |
15:11:53.73 |
-48:32:16.9 |
HIP 74285 |
10.15 |
| 2026-08-07 12:00 |
15:11:53.11 |
-48:31:53.0 |
HIP 74285 |
9.99 |
| 2026-08-08 00:00 |
15:11:52.53 |
-48:31:29.2 |
HIP 74285 |
9.84 |
| 2026-08-08 12:00 |
15:11:52.00 |
-48:31:05.5 |
HIP 74285 |
9.72 |
| 2026-08-09 00:00 |
15:11:51.51 |
-48:30:41.9 |
HIP 74285 |
9.62 |
| 2026-08-09 12:00 |
15:11:51.07 |
-48:30:18.3 |
HIP 74285 |
9.55 |
| 2026-08-10 00:00 |
15:11:50.68 |
-48:29:54.9 |
HIP 74285 |
9.50 |
| 2026-08-10 12:00 |
15:11:50.33 |
-48:29:31.6 |
HIP 74285 |
9.47 |
| 2026-08-11 00:00 |
15:11:50.03 |
-48:29:08.4 |
HIP 74285 |
9.47 |
| 2026-08-11 12:00 |
15:11:49.77 |
-48:28:45.3 |
HIP 74285 |
9.49 |
| 2026-08-12 00:00 |
15:11:49.56 |
-48:28:22.3 |
HIP 74285 |
9.53 |
| 2026-08-12 12:00 |
15:11:49.40 |
-48:27:59.5 |
HIP 74285 |
9.59 |
| 2026-08-13 00:00 |
15:11:49.28 |
-48:27:36.7 |
HIP 74285 |
9.68 |
| 2026-08-13 12:00 |
15:11:49.21 |
-48:27:14.1 |
HIP 74285 |
9.78 |
| 2026-08-14 00:00 |
15:11:49.18 |
-48:26:51.6 |
HIP 74285 |
9.91 |
| 2026-08-14 12:00 |
15:11:49.20 |
-48:26:29.2 |
HIP 74285 |
10.05 |
| 2026-08-15 00:00 |
15:11:49.26 |
-48:26:06.9 |
HIP 74285 |
10.21 |
| 2026-08-15 12:00 |
15:11:49.37 |
-48:25:44.8 |
HIP 74285 |
10.39 |
| 2026-08-16 00:00 |
15:11:49.52 |
-48:25:22.8 |
HIP 74285 |
10.58 |
| 2026-08-16 12:00 |
15:11:49.72 |
-48:25:00.9 |
HIP 74285 |
10.79 |
| 2026-08-17 00:00 |
15:11:49.96 |
-48:24:39.2 |
HIP 74285 |
11.01 |
| 2026-08-17 12:00 |
15:11:50.25 |
-48:24:17.6 |
HIP 74285 |
11.25 |
| 2026-08-18 00:00 |
15:11:50.58 |
-48:23:56.1 |
HIP 74285 |
11.49 |
| 2026-08-18 12:00 |
15:11:50.96 |
-48:23:34.8 |
HIP 74285 |
11.75 |
| 2026-08-19 00:00 |
15:11:51.39 |
-48:23:13.6 |
HIP 74285 |
12.01 |