메타데이터
| 항목 |
값 |
| Designation |
C/2011 G1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-09-16T09:53:33.371520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:48Z |
| Obs used |
487 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
5.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-11-20.0000000 |
| e |
1.00100017 |
| q (au) |
2.155142 |
| a (au) |
-2154.765225 |
| i (deg) |
162.233498 |
| Ω (om, deg) |
152.590960 |
| ω (w, deg) |
354.550126 |
| M (ma, deg) |
0.000636 |
밝기
산란 + 전체 선형
$$
M_a = (13.505 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.505 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
| 2011-04-05 |
2011-06-17 |
+0.1582 |
-0.303 |
| 2011-10-25 |
2011-12-30 |
+31.4390 |
-11.639 |
| 2011-12-30 |
2012-03-18 |
-17.9862 |
+7.533 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
00:09:27.62 |
+12:22:44.6 |
HIP 799 |
20.81 |
| 2026-09-20 12:00 |
00:09:23.90 |
+12:22:21.2 |
HIP 799 |
21.46 |
| 2026-09-21 00:00 |
00:09:20.17 |
+12:21:57.7 |
HIP 799 |
22.14 |
| 2026-09-21 12:00 |
00:09:16.44 |
+12:21:34.1 |
HIP 799 |
22.84 |
| 2026-09-22 00:00 |
00:09:12.71 |
+12:21:10.4 |
HIP 799 |
23.57 |
| 2026-09-22 12:00 |
00:09:08.98 |
+12:20:46.5 |
HIP 799 |
24.31 |
| 2026-09-23 00:00 |
00:09:05.24 |
+12:20:22.6 |
HIP 799 |
25.08 |
| 2026-09-23 12:00 |
00:09:01.51 |
+12:19:58.5 |
HIP 799 |
25.86 |
| 2026-09-24 00:00 |
00:08:57.77 |
+12:19:34.3 |
HIP 799 |
26.66 |
| 2026-09-24 12:00 |
00:08:54.04 |
+12:19:10.1 |
HIP 799 |
27.47 |
| 2026-09-25 00:00 |
00:08:50.30 |
+12:18:45.7 |
HIP 799 |
28.30 |
| 2026-09-25 12:00 |
00:08:46.56 |
+12:18:21.3 |
HIP 799 |
29.14 |
| 2026-09-26 00:00 |
00:08:42.83 |
+12:17:56.7 |
HIP 799 |
29.99 |
| 2026-09-26 12:00 |
00:08:39.10 |
+12:17:32.1 |
HIP 799 |
30.85 |
| 2026-09-27 00:00 |
00:08:35.36 |
+12:17:07.3 |
HIP 722 |
31.57 |
| 2026-09-27 12:00 |
00:08:31.63 |
+12:16:42.5 |
HIP 722 |
32.14 |
| 2026-09-28 00:00 |
00:08:27.90 |
+12:16:17.5 |
HIP 722 |
32.73 |
| 2026-09-28 12:00 |
00:08:24.17 |
+12:15:52.5 |
HIP 722 |
33.34 |
| 2026-09-29 00:00 |
00:08:20.44 |
+12:15:27.4 |
HIP 722 |
33.97 |
| 2026-09-29 12:00 |
00:08:16.72 |
+12:15:02.2 |
HIP 722 |
34.62 |
| 2026-09-30 00:00 |
00:08:12.99 |
+12:14:37.0 |
HIP 722 |
35.29 |
| 2026-09-30 12:00 |
00:08:09.28 |
+12:14:11.6 |
HIP 722 |
35.98 |
| 2026-10-01 00:00 |
00:08:05.56 |
+12:13:46.2 |
HIP 722 |
36.68 |
| 2026-10-01 12:00 |
00:08:01.85 |
+12:13:20.7 |
HIP 491 |
36.44 |
| 2026-10-02 00:00 |
00:07:58.14 |
+12:12:55.1 |
HIP 491 |
35.88 |
| 2026-10-02 12:00 |
00:07:54.43 |
+12:12:29.4 |
HIP 491 |
35.34 |
| 2026-10-03 00:00 |
00:07:50.73 |
+12:12:03.7 |
HIP 491 |
34.83 |
| 2026-10-03 12:00 |
00:07:47.03 |
+12:11:37.9 |
HIP 491 |
34.34 |
| 2026-10-04 00:00 |
00:07:43.34 |
+12:11:12.0 |
HIP 491 |
33.87 |
| 2026-10-04 12:00 |
00:07:39.66 |
+12:10:46.1 |
HIP 491 |
33.42 |
| 2026-10-05 00:00 |
00:07:35.97 |
+12:10:20.1 |
HIP 491 |
33.00 |
| 2026-10-05 12:00 |
00:07:32.30 |
+12:09:54.0 |
HIP 491 |
32.61 |
| 2026-10-06 00:00 |
00:07:28.63 |
+12:09:27.9 |
HIP 491 |
32.25 |
| 2026-10-06 12:00 |
00:07:24.96 |
+12:09:01.7 |
HIP 491 |
31.91 |
| 2026-10-07 00:00 |
00:07:21.31 |
+12:08:35.4 |
HIP 491 |
31.61 |
| 2026-10-07 12:00 |
00:07:17.66 |
+12:08:09.1 |
HIP 491 |
31.33 |
| 2026-10-08 00:00 |
00:07:14.02 |
+12:07:42.8 |
HIP 491 |
31.09 |
| 2026-10-08 12:00 |
00:07:10.38 |
+12:07:16.4 |
HIP 491 |
30.87 |
| 2026-10-09 00:00 |
00:07:06.75 |
+12:06:49.9 |
HIP 491 |
30.69 |
| 2026-10-09 12:00 |
00:07:03.13 |
+12:06:23.4 |
HIP 491 |
30.55 |
| 2026-10-10 00:00 |
00:06:59.52 |
+12:05:56.9 |
HIP 491 |
30.43 |
| 2026-10-10 12:00 |
00:06:55.92 |
+12:05:30.3 |
HIP 491 |
30.35 |
| 2026-10-11 00:00 |
00:06:52.33 |
+12:05:03.6 |
HIP 491 |
30.30 |