| 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) |
| 2026-03-26 00:00 |
05:24:49.75 |
+32:29:49.2 |
HIP 25361 |
9.53 |
| 2026-03-26 12:00 |
05:24:50.70 |
+32:29:42.3 |
HIP 25361 |
9.30 |
| 2026-03-27 00:00 |
05:24:51.69 |
+32:29:35.6 |
HIP 25361 |
9.06 |
| 2026-03-27 12:00 |
05:24:52.70 |
+32:29:28.8 |
HIP 25361 |
8.82 |
| 2026-03-28 00:00 |
05:24:53.75 |
+32:29:22.1 |
HIP 25361 |
8.57 |
| 2026-03-28 12:00 |
05:24:54.82 |
+32:29:15.5 |
HIP 25361 |
8.32 |
| 2026-03-29 00:00 |
05:24:55.93 |
+32:29:08.9 |
HIP 25361 |
8.07 |
| 2026-03-29 12:00 |
05:24:57.07 |
+32:29:02.3 |
HIP 25361 |
7.81 |
| 2026-03-30 00:00 |
05:24:58.23 |
+32:28:55.8 |
HIP 25361 |
7.54 |
| 2026-03-30 12:00 |
05:24:59.43 |
+32:28:49.3 |
HIP 25361 |
7.27 |
| 2026-03-31 00:00 |
05:25:00.65 |
+32:28:42.9 |
HIP 25361 |
7.00 |
| 2026-03-31 12:00 |
05:25:01.91 |
+32:28:36.5 |
HIP 25361 |
6.72 |
| 2026-04-01 00:00 |
05:25:03.19 |
+32:28:30.2 |
HIP 25361 |
6.44 |
| 2026-04-01 12:00 |
05:25:04.51 |
+32:28:23.9 |
HIP 25361 |
6.15 |
| 2026-04-02 00:00 |
05:25:05.85 |
+32:28:17.7 |
HIP 25361 |
5.87 |
| 2026-04-02 12:00 |
05:25:07.22 |
+32:28:11.5 |
HIP 25361 |
5.57 |
| 2026-04-03 00:00 |
05:25:08.62 |
+32:28:05.3 |
HIP 25361 |
5.28 |
| 2026-04-03 12:00 |
05:25:10.05 |
+32:27:59.2 |
HIP 25361 |
4.98 |
| 2026-04-04 00:00 |
05:25:11.51 |
+32:27:53.2 |
HIP 25361 |
4.69 |
| 2026-04-04 12:00 |
05:25:13.00 |
+32:27:47.2 |
HIP 25361 |
4.39 |
| 2026-04-05 00:00 |
05:25:14.52 |
+32:27:41.2 |
HIP 25361 |
4.10 |
| 2026-04-05 12:00 |
05:25:16.06 |
+32:27:35.3 |
HIP 25361 |
3.80 |
| 2026-04-06 00:00 |
05:25:17.63 |
+32:27:29.5 |
HIP 25361 |
3.52 |
| 2026-04-06 12:00 |
05:25:19.23 |
+32:27:23.7 |
HIP 25361 |
3.24 |
| 2026-04-07 00:00 |
05:25:20.86 |
+32:27:17.9 |
HIP 25361 |
2.98 |
| 2026-04-07 12:00 |
05:25:22.52 |
+32:27:12.2 |
HIP 25361 |
2.73 |
| 2026-04-08 00:00 |
05:25:24.21 |
+32:27:06.6 |
HIP 25361 |
2.52 |
| 2026-04-08 12:00 |
05:25:25.92 |
+32:27:01.0 |
HIP 25361 |
2.34 |
| 2026-04-09 00:00 |
05:25:27.66 |
+32:26:55.4 |
HIP 25361 |
2.21 |
| 2026-04-09 12:00 |
05:25:29.42 |
+32:26:49.9 |
HIP 25361 |
2.14 |
| 2026-04-10 00:00 |
05:25:31.22 |
+32:26:44.5 |
HIP 25361 |
2.15 |
| 2026-04-10 12:00 |
05:25:33.04 |
+32:26:39.1 |
HIP 25361 |
2.22 |
| 2026-04-11 00:00 |
05:25:34.89 |
+32:26:33.7 |
HIP 25361 |
2.37 |
| 2026-04-11 12:00 |
05:25:36.76 |
+32:26:28.4 |
HIP 25361 |
2.57 |
| 2026-04-12 00:00 |
05:25:38.67 |
+32:26:23.2 |
HIP 25361 |
2.82 |
| 2026-04-12 12:00 |
05:25:40.60 |
+32:26:18.0 |
HIP 25361 |
3.12 |
| 2026-04-13 00:00 |
05:25:42.55 |
+32:26:12.9 |
HIP 25361 |
3.44 |
| 2026-04-13 12:00 |
05:25:44.53 |
+32:26:07.8 |
HIP 25361 |
3.79 |
| 2026-04-14 00:00 |
05:25:46.54 |
+32:26:02.8 |
HIP 25361 |
4.16 |
| 2026-04-14 12:00 |
05:25:48.57 |
+32:25:57.8 |
HIP 25361 |
4.54 |
| 2026-04-15 00:00 |
05:25:50.63 |
+32:25:52.9 |
HIP 25361 |
4.94 |
| 2026-04-15 12:00 |
05:25:52.72 |
+32:25:48.0 |
HIP 25361 |
5.35 |
| 2026-04-16 00:00 |
05:25:54.83 |
+32:25:43.2 |
HIP 25361 |
5.78 |