| Parameter |
Value |
| Designation |
C/2000 SV74 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-04-30T12:44:48.128640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:06Z |
| Obs used |
2039 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
5.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-12-17.0000000 |
| e |
1.00486188 |
| q (au) |
3.541897 |
| a (au) |
-728.503515 |
| i (deg) |
75.236666 |
| Ω (om, deg) |
24.186314 |
| ω (w, deg) |
76.239354 |
| M (ma, deg) |
0.011552 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.901 + 3.631\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.901 |
| n |
3.631 |
| gf |
0.850 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.002 |
| 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 |
| 2000-10-21 |
2002-04-10 |
-2.1213 |
+1.220 |
| 2002-04-30 |
2005-04-05 |
-2.0066 |
+1.694 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
12:56:13.17 |
-51:03:43.3 |
HIP 63210 |
11.48 |
| 2026-09-20 12:00 |
12:56:16.82 |
-51:03:47.7 |
HIP 63210 |
11.03 |
| 2026-09-21 00:00 |
12:56:20.48 |
-51:03:52.4 |
HIP 63210 |
10.59 |
| 2026-09-21 12:00 |
12:56:24.14 |
-51:03:57.3 |
HIP 63210 |
10.17 |
| 2026-09-22 00:00 |
12:56:27.82 |
-51:04:02.4 |
HIP 63210 |
9.75 |
| 2026-09-22 12:00 |
12:56:31.51 |
-51:04:07.8 |
HIP 63210 |
9.34 |
| 2026-09-23 00:00 |
12:56:35.20 |
-51:04:13.5 |
HIP 63210 |
8.96 |
| 2026-09-23 12:00 |
12:56:38.90 |
-51:04:19.3 |
HIP 63210 |
8.59 |
| 2026-09-24 00:00 |
12:56:42.61 |
-51:04:25.5 |
HIP 63210 |
8.24 |
| 2026-09-24 12:00 |
12:56:46.33 |
-51:04:31.9 |
HIP 63210 |
7.92 |
| 2026-09-25 00:00 |
12:56:50.06 |
-51:04:38.5 |
HIP 63210 |
7.62 |
| 2026-09-25 12:00 |
12:56:53.79 |
-51:04:45.3 |
HIP 63210 |
7.36 |
| 2026-09-26 00:00 |
12:56:57.53 |
-51:04:52.4 |
HIP 63210 |
7.13 |
| 2026-09-26 12:00 |
12:57:01.28 |
-51:04:59.8 |
HIP 63210 |
6.94 |
| 2026-09-27 00:00 |
12:57:05.03 |
-51:05:07.4 |
HIP 63210 |
6.80 |
| 2026-09-27 12:00 |
12:57:08.79 |
-51:05:15.2 |
HIP 63210 |
6.70 |
| 2026-09-28 00:00 |
12:57:12.56 |
-51:05:23.3 |
HIP 63210 |
6.66 |
| 2026-09-28 12:00 |
12:57:16.33 |
-51:05:31.6 |
HIP 63210 |
6.66 |
| 2026-09-29 00:00 |
12:57:20.10 |
-51:05:40.2 |
HIP 63210 |
6.72 |
| 2026-09-29 12:00 |
12:57:23.89 |
-51:05:49.0 |
HIP 63210 |
6.83 |
| 2026-09-30 00:00 |
12:57:27.67 |
-51:05:58.1 |
HIP 63210 |
6.99 |
| 2026-09-30 12:00 |
12:57:31.47 |
-51:06:07.4 |
HIP 63210 |
7.19 |
| 2026-10-01 00:00 |
12:57:35.26 |
-51:06:16.9 |
HIP 63210 |
7.43 |
| 2026-10-01 12:00 |
12:57:39.07 |
-51:06:26.7 |
HIP 63210 |
7.72 |
| 2026-10-02 00:00 |
12:57:42.87 |
-51:06:36.7 |
HIP 63210 |
8.04 |
| 2026-10-02 12:00 |
12:57:46.68 |
-51:06:47.0 |
HIP 63210 |
8.39 |
| 2026-10-03 00:00 |
12:57:50.50 |
-51:06:57.5 |
HIP 63210 |
8.77 |
| 2026-10-03 12:00 |
12:57:54.31 |
-51:07:08.2 |
HIP 63210 |
9.18 |
| 2026-10-04 00:00 |
12:57:58.13 |
-51:07:19.2 |
HIP 63210 |
9.60 |
| 2026-10-04 12:00 |
12:58:01.96 |
-51:07:30.4 |
HIP 63210 |
10.05 |
| 2026-10-05 00:00 |
12:58:05.78 |
-51:07:41.8 |
HIP 63210 |
10.51 |
| 2026-10-05 12:00 |
12:58:09.61 |
-51:07:53.5 |
HIP 63210 |
10.99 |
| 2026-10-06 00:00 |
12:58:13.45 |
-51:08:05.4 |
HIP 63210 |
11.49 |
| 2026-10-06 12:00 |
12:58:17.28 |
-51:08:17.6 |
HIP 63210 |
11.99 |
| 2026-10-07 00:00 |
12:58:21.11 |
-51:08:30.0 |
HIP 63210 |
12.51 |
| 2026-10-07 12:00 |
12:58:24.95 |
-51:08:42.6 |
HIP 63210 |
13.03 |
| 2026-10-08 00:00 |
12:58:28.79 |
-51:08:55.5 |
HIP 63210 |
13.57 |
| 2026-10-08 12:00 |
12:58:32.63 |
-51:09:08.6 |
HIP 63210 |
14.11 |
| 2026-10-09 00:00 |
12:58:36.46 |
-51:09:21.9 |
HIP 63210 |
14.66 |
| 2026-10-09 12:00 |
12:58:40.30 |
-51:09:35.5 |
HIP 63210 |
15.21 |
| 2026-10-10 00:00 |
12:58:44.14 |
-51:09:49.3 |
HIP 63210 |
15.77 |
| 2026-10-10 12:00 |
12:58:47.98 |
-51:10:03.4 |
HIP 63210 |
16.34 |
| 2026-10-11 00:00 |
12:58:51.82 |
-51:10:17.6 |
HIP 63210 |
16.91 |