| Parameter |
Value |
| Designation |
C/2007 W1 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-06-24T21:18:35.372160Z |
| Orbit solution date (soln_date, UTC) |
2022-06-10T02:47:51Z |
| Obs used |
1639 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
8.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-05-25.0000000 |
| e |
1.00010076 |
| q (au) |
0.849660 |
| a (au) |
-8432.181012 |
| i (deg) |
9.888931 |
| Ω (om, deg) |
334.529078 |
| ω (w, deg) |
306.550768 |
| M (ma, deg) |
-0.000039 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.072 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.072 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.660 |
| k |
0.968 |
| δ90 |
9.995 |
| 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 |
| 2007-03-21 |
2008-06-24 |
+5.8954 |
-3.412 |
| 2008-06-26 |
2008-12-17 |
+14.2002 |
-2.793 |
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 |
05:28:14.95 |
+32:22:51.9 |
HIP 25590 |
8.88 |
| 2026-05-12 12:00 |
05:28:18.14 |
+32:22:50.1 |
HIP 25590 |
9.02 |
| 2026-05-13 00:00 |
05:28:21.34 |
+32:22:48.5 |
HIP 25590 |
9.21 |
| 2026-05-13 12:00 |
05:28:24.56 |
+32:22:46.8 |
HIP 25590 |
9.44 |
| 2026-05-14 00:00 |
05:28:27.79 |
+32:22:45.3 |
HIP 25590 |
9.72 |
| 2026-05-14 12:00 |
05:28:31.03 |
+32:22:43.8 |
HIP 25590 |
10.04 |
| 2026-05-15 00:00 |
05:28:34.29 |
+32:22:42.3 |
HIP 25590 |
10.39 |
| 2026-05-15 12:00 |
05:28:37.57 |
+32:22:40.9 |
HIP 25590 |
10.78 |
| 2026-05-16 00:00 |
05:28:40.85 |
+32:22:39.6 |
HIP 25590 |
11.19 |
| 2026-05-16 12:00 |
05:28:44.15 |
+32:22:38.4 |
HIP 25590 |
11.63 |
| 2026-05-17 00:00 |
05:28:47.47 |
+32:22:37.2 |
HIP 25590 |
12.10 |
| 2026-05-17 12:00 |
05:28:50.79 |
+32:22:36.0 |
HIP 25696 |
11.95 |
| 2026-05-18 00:00 |
05:28:54.13 |
+32:22:34.9 |
HIP 25696 |
11.63 |
| 2026-05-18 12:00 |
05:28:57.48 |
+32:22:33.9 |
HIP 25696 |
11.34 |
| 2026-05-19 00:00 |
05:29:00.85 |
+32:22:32.9 |
HIP 25696 |
11.09 |
| 2026-05-19 12:00 |
05:29:04.22 |
+32:22:32.0 |
HIP 25696 |
10.88 |
| 2026-05-20 00:00 |
05:29:07.61 |
+32:22:31.2 |
HIP 25696 |
10.72 |
| 2026-05-20 12:00 |
05:29:11.01 |
+32:22:30.4 |
HIP 25696 |
10.60 |
| 2026-05-21 00:00 |
05:29:14.42 |
+32:22:29.6 |
HIP 25696 |
10.53 |
| 2026-05-21 12:00 |
05:29:17.84 |
+32:22:29.0 |
HIP 25696 |
10.51 |
| 2026-05-22 00:00 |
05:29:21.27 |
+32:22:28.4 |
HIP 25696 |
10.54 |
| 2026-05-22 12:00 |
05:29:24.71 |
+32:22:27.8 |
HIP 25696 |
10.62 |
| 2026-05-23 00:00 |
05:29:28.17 |
+32:22:27.3 |
HIP 25696 |
10.76 |
| 2026-05-23 12:00 |
05:29:31.63 |
+32:22:26.9 |
HIP 25696 |
10.94 |
| 2026-05-24 00:00 |
05:29:35.10 |
+32:22:26.5 |
HIP 25696 |
11.17 |
| 2026-05-24 12:00 |
05:29:38.59 |
+32:22:26.2 |
HIP 25696 |
11.44 |
| 2026-05-25 00:00 |
05:29:42.08 |
+32:22:25.9 |
HIP 25696 |
11.75 |
| 2026-05-25 12:00 |
05:29:45.58 |
+32:22:25.7 |
HIP 25696 |
12.10 |
| 2026-05-26 00:00 |
05:29:49.09 |
+32:22:25.6 |
HIP 25696 |
12.49 |
| 2026-05-26 12:00 |
05:29:52.61 |
+32:22:25.5 |
HIP 25696 |
12.91 |
| 2026-05-27 00:00 |
05:29:56.13 |
+32:22:25.4 |
HIP 25696 |
13.36 |
| 2026-05-27 12:00 |
05:29:59.67 |
+32:22:25.5 |
HIP 25696 |
13.84 |
| 2026-05-28 00:00 |
05:30:03.21 |
+32:22:25.5 |
HIP 25696 |
14.35 |
| 2026-05-28 12:00 |
05:30:06.76 |
+32:22:25.7 |
HIP 25696 |
14.87 |
| 2026-05-29 00:00 |
05:30:10.32 |
+32:22:25.9 |
HIP 25696 |
15.42 |
| 2026-05-29 12:00 |
05:30:13.89 |
+32:22:26.2 |
HIP 25696 |
15.98 |
| 2026-05-30 00:00 |
05:30:17.46 |
+32:22:26.5 |
HIP 25696 |
16.57 |
| 2026-05-30 12:00 |
05:30:21.04 |
+32:22:26.8 |
HIP 25696 |
17.16 |
| 2026-05-31 00:00 |
05:30:24.62 |
+32:22:27.3 |
HIP 25696 |
17.77 |
| 2026-05-31 12:00 |
05:30:28.22 |
+32:22:27.8 |
HIP 25876 |
17.23 |
| 2026-06-01 00:00 |
05:30:31.82 |
+32:22:28.3 |
HIP 25876 |
16.70 |
| 2026-06-01 12:00 |
05:30:35.42 |
+32:22:28.9 |
HIP 25876 |
16.19 |
| 2026-06-02 00:00 |
05:30:39.03 |
+32:22:29.6 |
HIP 25876 |
15.70 |