C/2000 SV74 (LINEAR)
| 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 |
-2.0065 |
+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) |
| 2026-02-03 00:00 |
13:06:07.64 |
-52:28:33.0 |
HIP 63833 |
10.78 |
| 2026-02-03 12:00 |
13:06:05.75 |
-52:28:57.3 |
HIP 63833 |
10.58 |
| 2026-02-04 00:00 |
13:06:03.83 |
-52:29:21.4 |
HIP 63833 |
10.40 |
| 2026-02-04 12:00 |
13:06:01.87 |
-52:29:45.4 |
HIP 63833 |
10.24 |
| 2026-02-05 00:00 |
13:05:59.88 |
-52:30:09.1 |
HIP 63833 |
10.09 |
| 2026-02-05 12:00 |
13:05:57.86 |
-52:30:32.6 |
HIP 63833 |
9.96 |
| 2026-02-06 00:00 |
13:05:55.80 |
-52:30:55.9 |
HIP 63833 |
9.84 |
| 2026-02-06 12:00 |
13:05:53.71 |
-52:31:19.0 |
HIP 63833 |
9.74 |
| 2026-02-07 00:00 |
13:05:51.59 |
-52:31:41.9 |
HIP 63833 |
9.67 |
| 2026-02-07 12:00 |
13:05:49.43 |
-52:32:04.6 |
HIP 63833 |
9.61 |
| 2026-02-08 00:00 |
13:05:47.24 |
-52:32:27.1 |
HIP 63833 |
9.57 |
| 2026-02-08 12:00 |
13:05:45.02 |
-52:32:49.4 |
HIP 63833 |
9.55 |
| 2026-02-09 00:00 |
13:05:42.77 |
-52:33:11.4 |
HIP 63833 |
9.55 |
| 2026-02-09 12:00 |
13:05:40.48 |
-52:33:33.3 |
HIP 63833 |
9.58 |
| 2026-02-10 00:00 |
13:05:38.16 |
-52:33:54.9 |
HIP 63833 |
9.62 |
| 2026-02-10 12:00 |
13:05:35.81 |
-52:34:16.3 |
HIP 63833 |
9.68 |
| 2026-02-11 00:00 |
13:05:33.43 |
-52:34:37.5 |
HIP 63833 |
9.76 |
| 2026-02-11 12:00 |
13:05:31.01 |
-52:34:58.4 |
HIP 63833 |
9.87 |
| 2026-02-12 00:00 |
13:05:28.57 |
-52:35:19.1 |
HIP 63833 |
9.99 |
| 2026-02-12 12:00 |
13:05:26.09 |
-52:35:39.6 |
HIP 63833 |
10.13 |
| 2026-02-13 00:00 |
13:05:23.58 |
-52:35:59.9 |
HIP 63833 |
10.29 |
| 2026-02-13 12:00 |
13:05:21.04 |
-52:36:19.9 |
HIP 63833 |
10.46 |
| 2026-02-14 00:00 |
13:05:18.47 |
-52:36:39.7 |
HIP 63833 |
10.66 |
| 2026-02-14 12:00 |
13:05:15.86 |
-52:36:59.3 |
HIP 63833 |
10.87 |
| 2026-02-15 00:00 |
13:05:13.23 |
-52:37:18.6 |
HIP 63833 |
11.09 |
| 2026-02-15 12:00 |
13:05:10.57 |
-52:37:37.7 |
HIP 63833 |
11.33 |
| 2026-02-16 00:00 |
13:05:07.88 |
-52:37:56.6 |
HIP 63833 |
11.58 |
| 2026-02-16 12:00 |
13:05:05.15 |
-52:38:15.2 |
HIP 63833 |
11.84 |
| 2026-02-17 00:00 |
13:05:02.40 |
-52:38:33.6 |
HIP 63833 |
12.12 |
| 2026-02-17 12:00 |
13:04:59.62 |
-52:38:51.7 |
HIP 63833 |
12.40 |
| 2026-02-18 00:00 |
13:04:56.81 |
-52:39:09.6 |
HIP 63833 |
12.70 |
| 2026-02-18 12:00 |
13:04:53.97 |
-52:39:27.2 |
HIP 63833 |
13.01 |
| 2026-02-19 00:00 |
13:04:51.10 |
-52:39:44.6 |
HIP 63833 |
13.33 |
| 2026-02-19 12:00 |
13:04:48.20 |
-52:40:01.7 |
HIP 63833 |
13.66 |
| 2026-02-20 00:00 |
13:04:45.28 |
-52:40:18.6 |
HIP 63833 |
13.99 |
| 2026-02-20 12:00 |
13:04:42.32 |
-52:40:35.3 |
HIP 63833 |
14.33 |
| 2026-02-21 00:00 |
13:04:39.34 |
-52:40:51.7 |
HIP 63833 |
14.69 |
| 2026-02-21 12:00 |
13:04:36.33 |
-52:41:07.8 |
HIP 63833 |
15.04 |
| 2026-02-22 00:00 |
13:04:33.29 |
-52:41:23.7 |
HIP 63833 |
15.41 |
| 2026-02-22 12:00 |
13:04:30.23 |
-52:41:39.3 |
HIP 63833 |
15.78 |
| 2026-02-23 00:00 |
13:04:27.14 |
-52:41:54.7 |
HIP 63833 |
16.16 |
| 2026-02-23 12:00 |
13:04:24.02 |
-52:42:09.8 |
HIP 63833 |
16.54 |
| 2026-02-24 00:00 |
13:04:20.88 |
-52:42:24.6 |
HIP 63833 |
16.93 |