메타데이터
| 항목 |
값 |
| Designation |
C/2004 Q2 (Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-01-24T21:52:04.915200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:43Z |
| Obs used |
3612 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2005-03-30.0000000 |
| e |
0.99950132 |
| q (au) |
1.205042 |
| a (au) |
2416.445814 |
| i (deg) |
38.588949 |
| Ω (om, deg) |
93.622895 |
| ω (w, deg) |
19.504703 |
| M (ma, deg) |
0.000532 |
밝기
산란 + 전체 선형
$$
M_a = (4.612 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.612 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.921 |
| k |
0.988 |
| δ90 |
1.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2004-08-28 |
2005-01-24 |
-4.3508 |
+1.375 |
| 2005-01-24 |
2006-09-09 |
-1.9949 |
+0.688 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
18:20:05.10 |
-23:32:35.3 |
HIP 89915 |
26.27 |
| 2026-05-12 12:00 |
18:20:02.95 |
-23:32:37.4 |
HIP 89915 |
26.44 |
| 2026-05-13 00:00 |
18:20:00.77 |
-23:32:39.6 |
HIP 89915 |
26.63 |
| 2026-05-13 12:00 |
18:19:58.58 |
-23:32:41.7 |
HIP 89915 |
26.82 |
| 2026-05-14 00:00 |
18:19:56.37 |
-23:32:43.9 |
HIP 89915 |
27.02 |
| 2026-05-14 12:00 |
18:19:54.15 |
-23:32:46.1 |
HIP 89915 |
27.23 |
| 2026-05-15 00:00 |
18:19:51.90 |
-23:32:48.2 |
HIP 89915 |
27.46 |
| 2026-05-15 12:00 |
18:19:49.64 |
-23:32:50.4 |
HIP 89915 |
27.69 |
| 2026-05-16 00:00 |
18:19:47.35 |
-23:32:52.6 |
HIP 89915 |
27.93 |
| 2026-05-16 12:00 |
18:19:45.06 |
-23:32:54.8 |
HIP 89915 |
28.18 |
| 2026-05-17 00:00 |
18:19:42.74 |
-23:32:56.9 |
HIP 89915 |
28.44 |
| 2026-05-17 12:00 |
18:19:40.41 |
-23:32:59.1 |
HIP 89915 |
28.71 |
| 2026-05-18 00:00 |
18:19:38.06 |
-23:33:01.3 |
HIP 89915 |
28.99 |
| 2026-05-18 12:00 |
18:19:35.69 |
-23:33:03.5 |
HIP 89915 |
29.28 |
| 2026-05-19 00:00 |
18:19:33.30 |
-23:33:05.8 |
HIP 89915 |
29.58 |
| 2026-05-19 12:00 |
18:19:30.90 |
-23:33:08.0 |
HIP 89915 |
29.89 |
| 2026-05-20 00:00 |
18:19:28.49 |
-23:33:10.2 |
HIP 89915 |
30.20 |
| 2026-05-20 12:00 |
18:19:26.06 |
-23:33:12.4 |
HIP 89741 |
30.26 |
| 2026-05-21 00:00 |
18:19:23.61 |
-23:33:14.6 |
HIP 89741 |
30.16 |
| 2026-05-21 12:00 |
18:19:21.15 |
-23:33:16.9 |
HIP 89741 |
30.06 |
| 2026-05-22 00:00 |
18:19:18.67 |
-23:33:19.1 |
HIP 89741 |
29.98 |
| 2026-05-22 12:00 |
18:19:16.17 |
-23:33:21.3 |
HIP 89741 |
29.90 |
| 2026-05-23 00:00 |
18:19:13.67 |
-23:33:23.6 |
HIP 89741 |
29.84 |
| 2026-05-23 12:00 |
18:19:11.14 |
-23:33:25.8 |
HIP 89741 |
29.78 |
| 2026-05-24 00:00 |
18:19:08.61 |
-23:33:28.1 |
HIP 89741 |
29.74 |
| 2026-05-24 12:00 |
18:19:06.05 |
-23:33:30.3 |
HIP 89741 |
29.71 |
| 2026-05-25 00:00 |
18:19:03.49 |
-23:33:32.6 |
HIP 89741 |
29.68 |
| 2026-05-25 12:00 |
18:19:00.91 |
-23:33:34.8 |
HIP 89741 |
29.67 |
| 2026-05-26 00:00 |
18:18:58.32 |
-23:33:37.1 |
HIP 89741 |
29.68 |
| 2026-05-26 12:00 |
18:18:55.71 |
-23:33:39.4 |
HIP 89741 |
29.69 |
| 2026-05-27 00:00 |
18:18:53.09 |
-23:33:41.6 |
HIP 89741 |
29.72 |
| 2026-05-27 12:00 |
18:18:50.46 |
-23:33:43.9 |
HIP 89741 |
29.75 |
| 2026-05-28 00:00 |
18:18:47.81 |
-23:33:46.2 |
HIP 89741 |
29.80 |
| 2026-05-28 12:00 |
18:18:45.16 |
-23:33:48.4 |
HIP 89741 |
29.87 |
| 2026-05-29 00:00 |
18:18:42.49 |
-23:33:50.7 |
HIP 89741 |
29.94 |
| 2026-05-29 12:00 |
18:18:39.80 |
-23:33:53.0 |
HIP 89741 |
30.03 |
| 2026-05-30 00:00 |
18:18:37.11 |
-23:33:55.3 |
HIP 89741 |
30.13 |
| 2026-05-30 12:00 |
18:18:34.40 |
-23:33:57.5 |
HIP 89741 |
30.25 |
| 2026-05-31 00:00 |
18:18:31.68 |
-23:33:59.8 |
HIP 89741 |
30.37 |
| 2026-05-31 12:00 |
18:18:28.96 |
-23:34:02.1 |
HIP 89741 |
30.51 |
| 2026-06-01 00:00 |
18:18:26.21 |
-23:34:04.4 |
HIP 89741 |
30.66 |
| 2026-06-01 12:00 |
18:18:23.46 |
-23:34:06.6 |
HIP 89741 |
30.83 |
| 2026-06-02 00:00 |
18:18:20.70 |
-23:34:08.9 |
HIP 89741 |
31.00 |