| Parameter |
Value |
| Designation |
C/1955 N1 (Bakharev-Macfarlane-Krienke) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1955-07-11T12:59:41.798400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1955-08-16.0000000 |
| e |
0.99424862 |
| q (au) |
1.427452 |
| a (au) |
248.192798 |
| i (deg) |
50.033957 |
| Ω (om, deg) |
303.466133 |
| ω (w, deg) |
13.216239 |
| M (ma, deg) |
0.008938 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.175 + 5.060\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.175 |
| n |
5.060 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1955-07-13 |
1955-09-13 |
+0.5509 |
-0.010 |
| 1955-09-13 |
1955-11-23 |
+6.3738 |
-2.002 |
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 |
08:21:09.66 |
+19:17:05.0 |
HIP 40836 |
19.00 |
| 2026-03-26 12:00 |
08:21:09.02 |
+19:17:06.9 |
HIP 40836 |
18.86 |
| 2026-03-27 00:00 |
08:21:08.40 |
+19:17:08.8 |
HIP 40836 |
18.72 |
| 2026-03-27 12:00 |
08:21:07.78 |
+19:17:10.6 |
HIP 40836 |
18.58 |
| 2026-03-28 00:00 |
08:21:07.18 |
+19:17:12.4 |
HIP 40836 |
18.44 |
| 2026-03-28 12:00 |
08:21:06.58 |
+19:17:14.1 |
HIP 40836 |
18.31 |
| 2026-03-29 00:00 |
08:21:06.00 |
+19:17:15.9 |
HIP 40836 |
18.18 |
| 2026-03-29 12:00 |
08:21:05.43 |
+19:17:17.5 |
HIP 40836 |
18.05 |
| 2026-03-30 00:00 |
08:21:04.87 |
+19:17:19.2 |
HIP 40836 |
17.93 |
| 2026-03-30 12:00 |
08:21:04.31 |
+19:17:20.8 |
HIP 40836 |
17.80 |
| 2026-03-31 00:00 |
08:21:03.77 |
+19:17:22.4 |
HIP 40836 |
17.68 |
| 2026-03-31 12:00 |
08:21:03.25 |
+19:17:23.9 |
HIP 40836 |
17.56 |
| 2026-04-01 00:00 |
08:21:02.73 |
+19:17:25.4 |
HIP 40836 |
17.45 |
| 2026-04-01 12:00 |
08:21:02.22 |
+19:17:26.9 |
HIP 40836 |
17.34 |
| 2026-04-02 00:00 |
08:21:01.72 |
+19:17:28.4 |
HIP 40836 |
17.23 |
| 2026-04-02 12:00 |
08:21:01.24 |
+19:17:29.8 |
HIP 40836 |
17.12 |
| 2026-04-03 00:00 |
08:21:00.76 |
+19:17:31.1 |
HIP 40836 |
17.01 |
| 2026-04-03 12:00 |
08:21:00.30 |
+19:17:32.4 |
HIP 40836 |
16.91 |
| 2026-04-04 00:00 |
08:20:59.84 |
+19:17:33.7 |
HIP 40836 |
16.81 |
| 2026-04-04 12:00 |
08:20:59.40 |
+19:17:35.0 |
HIP 40836 |
16.71 |
| 2026-04-05 00:00 |
08:20:58.97 |
+19:17:36.2 |
HIP 40836 |
16.62 |
| 2026-04-05 12:00 |
08:20:58.55 |
+19:17:37.4 |
HIP 40836 |
16.52 |
| 2026-04-06 00:00 |
08:20:58.14 |
+19:17:38.5 |
HIP 40836 |
16.44 |
| 2026-04-06 12:00 |
08:20:57.74 |
+19:17:39.6 |
HIP 40836 |
16.35 |
| 2026-04-07 00:00 |
08:20:57.35 |
+19:17:40.7 |
HIP 40836 |
16.26 |
| 2026-04-07 12:00 |
08:20:56.98 |
+19:17:41.8 |
HIP 40836 |
16.18 |
| 2026-04-08 00:00 |
08:20:56.61 |
+19:17:42.7 |
HIP 40836 |
16.10 |
| 2026-04-08 12:00 |
08:20:56.26 |
+19:17:43.7 |
HIP 40836 |
16.03 |
| 2026-04-09 00:00 |
08:20:55.92 |
+19:17:44.6 |
HIP 40836 |
15.95 |
| 2026-04-09 12:00 |
08:20:55.59 |
+19:17:45.5 |
HIP 40836 |
15.88 |
| 2026-04-10 00:00 |
08:20:55.27 |
+19:17:46.4 |
HIP 40836 |
15.81 |
| 2026-04-10 12:00 |
08:20:54.96 |
+19:17:47.2 |
HIP 40836 |
15.74 |
| 2026-04-11 00:00 |
08:20:54.66 |
+19:17:47.9 |
HIP 40836 |
15.68 |
| 2026-04-11 12:00 |
08:20:54.37 |
+19:17:48.7 |
HIP 40836 |
15.62 |
| 2026-04-12 00:00 |
08:20:54.10 |
+19:17:49.4 |
HIP 40836 |
15.56 |
| 2026-04-12 12:00 |
08:20:53.84 |
+19:17:50.0 |
HIP 40836 |
15.50 |
| 2026-04-13 00:00 |
08:20:53.59 |
+19:17:50.7 |
HIP 40836 |
15.45 |
| 2026-04-13 12:00 |
08:20:53.34 |
+19:17:51.2 |
HIP 40836 |
15.40 |
| 2026-04-14 00:00 |
08:20:53.12 |
+19:17:51.8 |
HIP 40836 |
15.35 |
| 2026-04-14 12:00 |
08:20:52.90 |
+19:17:52.3 |
HIP 40836 |
15.31 |
| 2026-04-15 00:00 |
08:20:52.69 |
+19:17:52.8 |
HIP 40836 |
15.26 |
| 2026-04-15 12:00 |
08:20:52.50 |
+19:17:53.2 |
HIP 40836 |
15.22 |
| 2026-04-16 00:00 |
08:20:52.31 |
+19:17:53.6 |
HIP 40836 |
15.18 |