메타데이터
| 항목 |
값 |
| Designation |
C/1978 G2 (McNaught-Tritton) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-08-23T23:05:11.348160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
5 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1978-08-28.0000000 |
| e |
1.00462671 |
| q (au) |
6.284334 |
| a (au) |
-1358.272229 |
| i (deg) |
153.180957 |
| Ω (om, deg) |
72.213979 |
| ω (w, deg) |
229.460098 |
| M (ma, deg) |
0.000080 |
밝기
산란 + 전체 선형
$$
M_a = (1.129 + 5.747\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
1.129 |
| n |
5.747 |
| gf |
0.999 |
| gb |
-0.886 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
03:47:03.48 |
+26:23:24.1 |
HIP 17609 |
14.30 |
| 2026-07-29 12:00 |
03:47:04.09 |
+26:23:29.2 |
HIP 17609 |
14.45 |
| 2026-07-30 00:00 |
03:47:04.69 |
+26:23:34.2 |
HIP 17609 |
14.61 |
| 2026-07-30 12:00 |
03:47:05.27 |
+26:23:39.1 |
HIP 17609 |
14.76 |
| 2026-07-31 00:00 |
03:47:05.84 |
+26:23:44.1 |
HIP 17609 |
14.91 |
| 2026-07-31 12:00 |
03:47:06.39 |
+26:23:49.0 |
HIP 17609 |
15.05 |
| 2026-08-01 00:00 |
03:47:06.93 |
+26:23:53.9 |
HIP 17609 |
15.19 |
| 2026-08-01 12:00 |
03:47:07.46 |
+26:23:58.7 |
HIP 17609 |
15.33 |
| 2026-08-02 00:00 |
03:47:07.97 |
+26:24:03.5 |
HIP 17609 |
15.47 |
| 2026-08-02 12:00 |
03:47:08.47 |
+26:24:08.3 |
HIP 17609 |
15.60 |
| 2026-08-03 00:00 |
03:47:08.95 |
+26:24:13.1 |
HIP 17609 |
15.74 |
| 2026-08-03 12:00 |
03:47:09.42 |
+26:24:17.8 |
HIP 17609 |
15.87 |
| 2026-08-04 00:00 |
03:47:09.87 |
+26:24:22.4 |
HIP 17609 |
15.99 |
| 2026-08-04 12:00 |
03:47:10.31 |
+26:24:27.1 |
HIP 17609 |
16.12 |
| 2026-08-05 00:00 |
03:47:10.74 |
+26:24:31.7 |
HIP 17609 |
16.24 |
| 2026-08-05 12:00 |
03:47:11.15 |
+26:24:36.2 |
HIP 17609 |
16.36 |
| 2026-08-06 00:00 |
03:47:11.54 |
+26:24:40.8 |
HIP 17609 |
16.47 |
| 2026-08-06 12:00 |
03:47:11.92 |
+26:24:45.2 |
HIP 17609 |
16.59 |
| 2026-08-07 00:00 |
03:47:12.28 |
+26:24:49.7 |
HIP 17609 |
16.70 |
| 2026-08-07 12:00 |
03:47:12.63 |
+26:24:54.1 |
HIP 17609 |
16.80 |
| 2026-08-08 00:00 |
03:47:12.97 |
+26:24:58.5 |
HIP 17609 |
16.91 |
| 2026-08-08 12:00 |
03:47:13.29 |
+26:25:02.8 |
HIP 17609 |
17.01 |
| 2026-08-09 00:00 |
03:47:13.59 |
+26:25:07.1 |
HIP 17609 |
17.11 |
| 2026-08-09 12:00 |
03:47:13.88 |
+26:25:11.4 |
HIP 17609 |
17.20 |
| 2026-08-10 00:00 |
03:47:14.16 |
+26:25:15.6 |
HIP 17609 |
17.30 |
| 2026-08-10 12:00 |
03:47:14.41 |
+26:25:19.8 |
HIP 17609 |
17.39 |
| 2026-08-11 00:00 |
03:47:14.66 |
+26:25:23.9 |
HIP 17609 |
17.47 |
| 2026-08-11 12:00 |
03:47:14.88 |
+26:25:28.0 |
HIP 17774 |
17.41 |
| 2026-08-12 00:00 |
03:47:15.10 |
+26:25:32.1 |
HIP 17774 |
17.33 |
| 2026-08-12 12:00 |
03:47:15.29 |
+26:25:36.1 |
HIP 17774 |
17.26 |
| 2026-08-13 00:00 |
03:47:15.48 |
+26:25:40.0 |
HIP 17774 |
17.19 |
| 2026-08-13 12:00 |
03:47:15.64 |
+26:25:44.0 |
HIP 17774 |
17.12 |
| 2026-08-14 00:00 |
03:47:15.79 |
+26:25:47.9 |
HIP 17774 |
17.06 |
| 2026-08-14 12:00 |
03:47:15.93 |
+26:25:51.7 |
HIP 17774 |
17.00 |
| 2026-08-15 00:00 |
03:47:16.05 |
+26:25:55.5 |
HIP 17774 |
16.94 |
| 2026-08-15 12:00 |
03:47:16.15 |
+26:25:59.3 |
HIP 17774 |
16.88 |
| 2026-08-16 00:00 |
03:47:16.24 |
+26:26:03.0 |
HIP 17774 |
16.83 |
| 2026-08-16 12:00 |
03:47:16.31 |
+26:26:06.7 |
HIP 17774 |
16.79 |
| 2026-08-17 00:00 |
03:47:16.37 |
+26:26:10.3 |
HIP 17774 |
16.74 |
| 2026-08-17 12:00 |
03:47:16.41 |
+26:26:13.9 |
HIP 17774 |
16.70 |
| 2026-08-18 00:00 |
03:47:16.43 |
+26:26:17.4 |
HIP 17774 |
16.66 |
| 2026-08-18 12:00 |
03:47:16.44 |
+26:26:20.9 |
HIP 17774 |
16.63 |
| 2026-08-19 00:00 |
03:47:16.44 |
+26:26:24.4 |
HIP 17774 |
16.60 |