diff --git a/coverage.txt b/coverage.txt
index d807d28..63b3c99 100644
--- a/coverage.txt
+++ b/coverage.txt
@@ -205,6 +205,66 @@ github.com/observerly/iris/pkg/frames/light.go:74.2,120.8 7 1
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@@ -279,66 +339,6 @@ github.com/observerly/iris/pkg/utils/utils.go:72.44,74.30 2 0
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@@ -396,24 +396,24 @@ github.com/observerly/iris/pkg/statistics/stats.go:186.2,188.15 2 4
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+github.com/observerly/iris/pkg/fits/header.go:540.46,577.2 22 1
+github.com/observerly/iris/pkg/fits/header.go:582.92,589.37 3 0
+github.com/observerly/iris/pkg/fits/header.go:589.37,592.22 2 0
+github.com/observerly/iris/pkg/fits/header.go:592.22,594.4 1 0
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+github.com/observerly/iris/pkg/fits/header.go:603.2,603.18 1 0
 github.com/observerly/iris/pkg/photometry/convolution.go:17.94,20.36 2 1
 github.com/observerly/iris/pkg/photometry/convolution.go:20.36,21.37 1 400
 github.com/observerly/iris/pkg/photometry/convolution.go:21.37,32.23 5 240000
@@ -618,7 +634,7 @@ github.com/observerly/iris/pkg/photometry/stars.go:67.101,73.2 3 2
 github.com/observerly/iris/pkg/photometry/stars.go:80.97,111.2 13 1
 github.com/observerly/iris/pkg/photometry/stars.go:121.119,125.25 2 95855
 github.com/observerly/iris/pkg/photometry/stars.go:125.25,129.39 2 862695
-github.com/observerly/iris/pkg/photometry/stars.go:129.39,132.4 2 862170
+github.com/observerly/iris/pkg/photometry/stars.go:129.39,132.4 2 862128
 github.com/observerly/iris/pkg/photometry/stars.go:135.2,137.23 2 95855
 github.com/observerly/iris/pkg/photometry/stars.go:148.89,152.25 2 7
 github.com/observerly/iris/pkg/photometry/stars.go:152.25,153.20 1 10253216
@@ -631,62 +647,62 @@ github.com/observerly/iris/pkg/photometry/stars.go:189.95,202.34 6 5
 github.com/observerly/iris/pkg/photometry/stars.go:202.34,208.3 3 85435
 github.com/observerly/iris/pkg/photometry/stars.go:210.2,217.29 4 5
 github.com/observerly/iris/pkg/photometry/stars.go:217.29,223.44 3 10420
-github.com/observerly/iris/pkg/photometry/stars.go:223.44,226.4 2 10173
+github.com/observerly/iris/pkg/photometry/stars.go:223.44,226.4 2 10171
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 github.com/observerly/iris/pkg/photometry/stars.go:232.85,249.26 8 6
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+github.com/observerly/iris/pkg/photometry/stars.go:249.26,254.38 2 8578
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-github.com/observerly/iris/pkg/photometry/stars.go:268.53,275.22 5 224543
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diff --git a/pkg/fits/header.go b/pkg/fits/header.go
index dda4f57..6c97525 100644
--- a/pkg/fits/header.go
+++ b/pkg/fits/header.go
@@ -14,6 +14,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"math"
 	"regexp"
 	"strconv"
 	"strings"
@@ -140,24 +141,81 @@ func (h *FITSHeader) Set(key string, value interface{}, comment string) error {
 			Value:   v,
 			Comment: comment,
 		}
-	case float32:
-		h.Floats[key] = FITSHeaderFloat{
+	case string:
+		h.Strings[key] = FITSHeaderString{
 			Value:   v,
 			Comment: comment,
 		}
+	case int:
+		if v < math.MinInt32 || v > math.MaxInt32 {
+			return fmt.Errorf("int value %d out of int32 range", v)
+		}
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+
+	case int8:
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+
+	case int16:
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+
 	case int32:
 		h.Ints[key] = FITSHeaderInt{
 			Value:   v,
 			Comment: comment,
 		}
-	case string:
-		h.Strings[key] = FITSHeaderString{
+	case uint:
+		if v > uint(math.MaxInt32) {
+			return fmt.Errorf("uint value %d out of int32 range", v)
+		}
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+	case uint8:
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+	case uint16:
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+	case uint32:
+		if v > uint32(math.MaxInt32) {
+			return fmt.Errorf("uint32 value %d out of int32 range", v)
+		}
+		h.Ints[key] = FITSHeaderInt{
+			Value:   int32(v),
+			Comment: comment,
+		}
+	case float32:
+		h.Floats[key] = FITSHeaderFloat{
 			Value:   v,
 			Comment: comment,
 		}
+	case float64:
+		if v > math.MaxFloat32 || v < -math.MaxFloat32 {
+			return fmt.Errorf("float64 value %f out of float32 range", v)
+		}
+		h.Floats[key] = FITSHeaderFloat{
+			Value:   float32(v),
+			Comment: comment,
+		}
+
 	default:
-		return fmt.Errorf("unsupported type: %T", v)
+		return fmt.Errorf("unsupported value type %T", value)
 	}
+
 	return nil
 }